Manufacture of ASTM A194, ASME SA194 Carbon Steel, Alloy Steel Rods, Bars, Nuts For Bolts
Manufacturer of ASTM A-194, ASME SA-194 Carbon Steel, Alloy Steel Rod, Bar, Nut For Bolt
Designation: A 194/A 194M – 05a Endorsed by
Manufacturers Standardization Society
of the Valve and Fittings Industry
Used in USNRC-RDT Standards
Standard Specification for
Carbon and Alloy Steel Nuts for Bolts for High Pressure or
High Temperature Service, or Both1
This standard is issued under the fixed designation A 194/A 194M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
- Scope*
1.1 This specification2 covers a variety of carbon, alloy, and
martensitic stainless steel nuts in the size range 1⁄4 through 4
in. and metric M6 through M100 nominal. It also covers
austenitic stainless steel nuts in the size range 1⁄4 in. and M6
nominal and above. These nuts are intended for high-pressure
or high-temperature service, or both. Grade substitutions without
the purchaser’s permission are not allowed.
1.2 Bars from which the nuts are made shall be hot-wrought.
The material may be further processed by centerless grinding
or by cold drawing. Austenitic stainless steel may be solution
annealed or annealed and strain-hardened. When annealed and
strain hardened austenitic stainless steel is ordered in accordance
with Supplementary Requirement S1, the purchaser
should take special care to ensure that 8.2.2, Supplementary
Requirement S1, and Appendix X1 are thoroughly understood.
1.3 Supplementary requirements (S1 through S6) of an
optional nature are provided. These shall apply only when
specified in the inquiry, contract, and order.
1.4 This specification is expressed in both inch-pound units
and in SI units. However, unless the order specifies the
applicable“ M” specification designation (SI units), the material
shall be furnished to inch-pound units.
1.5 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the
two systems may result in nonconformance with the specification. - Referenced Documents
2.1 ASTM Standards: 3
A 153/A 153M Specification for Zinc Coating (Hot-Dip) on
Iron and Steel Hardware
A 276 Specification for Stainless Steel Bars and Shapes
A 320/A 320M Specification for Alloy-Steel Bolting Materials
for Low-Temperature Service
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 962/A 962M Specification for Common Requirements
for Steel Fasteners or Fastener Materials, or Both, Intended
for Use at Any Temperature from Cryogenic to the Creep
Range
B 633 Specification for Electrodeposited Coatings of Zinc
on Iron and Steel
B 695 Specification for Coatings of Zinc Mechanically
Deposited on Iron and Steel
B 696 Specification for Coatings of Cadmium Mechanically
Deposited
B 766 Specification for Electrodeposited Coatings of Cadmium
E 112 Test Methods for Determining Average Grain Size
2.2 American National Standards:4
B 1.1 Unified Screw Threads
B 1.2 Gages and Gaging for Unified Inch Screw Threads
B 1.13M Metric Screw Threads
B 18.2.2 Square and Hex Nuts
B 18.2.4.6M Metric Heavy Hex Nuts - Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 Austenitic Grades—All grades with a prefix of “8” or
“9”. 1 This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting
Materials for Piping and Special Purpose Applications.
Current edition approved September 15, 2005. Published October 2005. Originally
approved in 1936. Last previous edition approved in 2005 as A 194/
A 194M–05.
2 For ASME Boiler and Pressure Vessel Code applications see related Specification
SA-194 in Section II of that code.
3 For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
4 Available from American National Standards Institute, 25 W. 43rd St., 4th
Floor, New York, NY 10036.
1
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
3.1.2 Ferritic Grades—Grades 1, 2, 2H, 2HM, 3, 4, 6, 6F, 7,
7M, and 16.
3.1.3 Lot:
3.1.3.1 Unless otherwise specified (see 3.1.3.2), a lot is the
quantity of nuts of a single nominal size and grade produced by
the same manufacturing process.
3.1.3.2 When Supplementary Requirement S5 is invoked on
the purchase order, the following definitions of a lot shall
apply:
For Grade 8 Nuts—The quantity of all the nuts of a single
nominal diameter and grade made from the same heat of steel
and made by the same manufacturing process.
For All Other Grade Nuts (see 8.2 and 8.1.2.1)—All the nuts
of a single nominal diameter and grade made from the same
heat number and heat treated in the same batch if batch-type
heat treating equipment is used or heat treated in the same
continuous run of not more than 8 h under the same conditions
if continuous-type heat treating equipment is used.
3.1.4 Type
3.1.4.1 For Grade 8 Nuts—Variations within the grade
designated by a letter and differentiated by chemistry and by
manufacturing process.
3.1.4.2 For Grade 6 Nuts—Variations within the grade
designated by the letter F as differentiated by chemical additions
made for machineability.
3.1.5 Series—The dimensional relationship and geometry
of the nuts as described in ANSI B 18.2.2 or B 18.2.4.6M. - Ordering Information
4.1 The inquiry and order for material under this specification
shall include the following as required to describe the
material adequately:
4.1.1 Specification designation, year date, and grade, issue
date and revision letter,
4.1.2 Quantity, number of pieces,
4.1.3 Dimensions (see Section 9),
4.1.4 Options in accordance with 8.2.2.1, 9.1, 9.2, 10.3, and
12, and
4.1.5 Supplementary Requirements, if any.
4.2 Coatings—Coatings are prohibited unless specified by
the purchaser. Nuts plated with cadmium or zinc shall be
marked as stated in 13.2. When coated nuts are ordered, the
purchaser should take special care to ensure that Appendix X2
is thoroughly understood. It is the purchaser’s responsibility to
specify in the purchase order all information required by the
coating facility. Examples of such information may include,
but are not limited to, the following:
4.2.1 Reference to the appropriate coating specification:
Specifications B 766, B 696, A 153/A 153M, B 695, B 633, or
other specifications as agreed upon by the purchaser and
manufacturer.
4.2.2 Requirements for coating thickness and local or batch
average thickness measurement, or both.
4.2.3 Requirements for selective plating or coating or modification
of dimensions to accommodate coating.
4.2.4 Requirements for hydrogen embrittlement relief.
4.3 See Supplementary Requirement S3 for nuts to be used
in low temperature applications (SpecificationA 320/A 320M). - Common Requirements
5.1 Material and fasteners supplied to this specification shall
conform to the requirements of Specification A 962/A 962M.
These requirements include test methods, finish, thread dimensions,
marking, certification, optional supplementary requirements,
and others. Failure to comply with the requirements of
Specification A 962/A 962M constitutes nonconformance with
this specification. In case of conflict between the requirements
of this specification and Specification A 962/A 962M, this
specification shall prevail. - Manufacture (Process)
6.1 Stainless steels for all types of Grade 6 and 8 nuts shall
be made by one of the following processes:
6.1.1 Electric-furnace (with separate degassing and refining
optional),
6.1.2 Vacuum induction furnace, or
6.1.3 Either of the above followed by electroslag remelting,
or consumable-arc remelting.
6.2 The steel producer shall exercise adequate control to
eliminate excessive unhomogeneity, nonmetallics, pipe, porosity,
and other defects.
6.3 Grades 1 and 2 nuts shall be hot or cold forged, or shall
be machined from hot-forged, hot-rolled, or cold-drawn bars.
6.3.1 All Grade 1 and 2 nuts made by cold forging or by
machining from cold-drawn bars shall be stress-relief annealed
at a temperature of at least 1000 °F [538 °C].
6.3.2 Grade 1 and 2 nuts made by hot forging or by
machining from hot-forged or hot-rolled bars need not be given
any stress relief annealing treatment.
6.4 Grades 2H, 2HM, 3, 4, 6, 6F, 7, 7M, and 16 nuts shall
be hot- or cold-forged or shall be machined from hot-forged,
hot-rolled, or cold-drawn bars and shall be heat treated to meet
the required mechanical properties. These grades shall be
reheated above the critical range of the steel, quenched in a
suitable medium, and then tempered at a temperature not less
than the following:
Grade
Minimum Tempering Temperature, °F
[°C]
2H 850 [455]
2HM 1150 [620]
3 1050 [565]
4 1100 [595]
6 and 6F 1100 [595]
7 1100 [595]
7M 1150 [620]
16 1200 [650]
Nuts machined from bar heat treated in accordance with this
specification need not be reheat-treated. For Grade 2HM and
7M nuts, a final stress relief shall be done at or above the
minimum tempering temperature after all forming, machining,
and tapping operations. This final stress relief may be the
tempering operation.
6.4.1 Grade 6 and 6F nuts shall be tempered for a minimum
of 1 h at the temperature.
6.5 Grades 8, 8C, 8M, 8T, 8F, 8P, 8N, 8MN, 8R, 8S, 8LN,
8MLN, 8MLCuN, and 9C nuts shall be hot or cold forged, or
shall be machined from hot-forged, hot-rolled or cold-drawn
bars.
A 194/A 194M – 05a
2
6.6 Grades 8A, 8CA, 8MA, 8TA, 8FA, 8PA, 8NA, 8MNA,
8RA, 8SA, 8LNA, 8MLNA, 8MLCuNA, and 9CA nuts shall
be hot- or cold-forged or shall be machined from hot-forged,
hot-rolled, or cold-drawn bars and the nuts shall subsequently
be carbide-solution treated by heating them for a sufficient time
at a temperature to dissolve chromium carbides followed by
cooling at a rate sufficient to prevent reprecipitation of the
carbides. - Chemical Composition
7.1 Each alloy shall conform to the chemical composition
requirements prescribed in Table 1. - Mechanical Requirements
8.1 Hardness Test:
8.1.1 Requirements:
8.1.1.1 All nuts shall meet the hardness requirements specified
in Table 2.
8.1.1.2 Sample nuts of Grades 1, 2, 2H, 2HM, 3, 4, 7, 7M,
and 16 which have been given the treatment described in 8.1.5
shall meet the minimum hardness specified in Table 2.
8.1.2 Number of Tests— (Grades 1, 2, 2H, 3, 4, 7, and 16
and all types of Grade 6):
8.1.2.1 Tests on the number of sample nuts in accordance
with the following table shall be performed by the manufacturer
following all production heat treatments:
Lot Size Samples
Up to 800 1
801 to 8000 2
8001 to 22 000 3
Over 22 000 5
8.1.2.2 In addition, a hardness test shall be performed by the
manufacturer in accordance with 8.1.5 on one sample nut
selected from each nominal diameter and series from each
grade and heat number following completion of all production
heat treatments.
8.1.3 Number of Tests, Grades 2HM and 7M:
8.1.3.1 Each nut shall be tested by Brinell or Rockwell
methods to ensure product conformance.5
8.1.3.2 In addition, 8.1.2.2 shall be met.
8.1.4 Number of Tests, All Types of Grade 8—Tests on the
number of sample nuts in accordance with 8.1.2.1 shall be
performed by the manufacturer.
8.1.5 Test 2—In addition to the testing required by 8.1.2.1
the manufacturer shall also perform hardness tests on sample
nuts after the following test heat treatment. After completion of
all production heat treatments heat the specimen nuts to the
temperatures indicated below for 24 h, then slow cool. Test at
room temperature.
GradeA
Temperature,
°F [°C]
1 850 [455]
2, 2H, 2HM 1000 [540]
3, 4, 7, 7M 1100 [590]
16 1200 [650]
ANuts intended to be coated with zinc or cadmium (marked in accordance with
the requirements of 13.3) are not subjected to the requirements of 8.1.5 (See
Appendix X2).
8.1.5.1 Special Requirement, Grades 2HM and 7M—
Preparation of Grades 2HM and 7M nuts for hardness test and
the hardness test itself shall be performed with consideration to
(1) protect legibility of markings; (2) minimize exterior dimensional
changes; and (3) maintain thread fit.
8.2 Proof Load Test:
8.2.1 Requirements—All nuts shall be capable of withstanding
the proof loads specified in Table 3 and Table 4. However,
nuts manufactured to dimensions and configurations other than
those covered by ANSI B 1.1, ANSI B 1.13M, ANSI B 18.2.2,
and B 18.2.4.6M are not subject to the proof load test.
8.2.2 Number of Tests:
8.2.2.1 The manufacturer shall test the number of nuts
specified in 8.1.2.1 following all production heat treatments.
Nuts that would require a proof load in excess of 160 000 lb/f
or 705 kN may be furnished on the basis of minimum hardness
requirements. Testing of nuts requiring a proof load in excess
of 160 000 lb/f or 705 kN is covered in Supplementary
Requirements S1 amd S4.
8.2.3 Test Method—The test shall be in accordance with
Annex A3, Paragraph A3.5.1, of Test Methods and Definitions
A 370.
8.3 Cone Proof Load Test:
8.3.1 Requirements—This test shall be performed only
when visible surface discontinuities become a matter of issue
between the manufacturer and the purchaser. The requirements
specified in Table 5 and Table 6 shall be met for the size
range 1⁄4 to 11⁄2 in. and M6 to M36. Nuts not in this size range
and all types of Grade 8 nuts are not subject to this test. Also,
nuts manufactured to dimensions and configurations other than
those covered by ANSI B 1.1, ANSI B 1.13M, ANSI B 18.2.2,
and ANSI B 18.2.4.6M are not subject to the cone proof load
test.
8.3.2 Number of Tests—Sample nuts in accordance with
8.1.2.1 shall be tested by the manufacturer.
8.3.3 Test Method—The test shall consist of assembling a
hardened cone (see Fig. 1) and the nut to be tested on a
hardened steel mandrel, and applying the proof load specified
in Table 5 and Table 6. The mandrel shall conform to the
requirements of Annex A3, Paragraph A3.5.1 of Test Methods
and Definitions A 370 except that the threads shall be in
accordance with ANSI B 1.1 of the appropriate thread series,
Class 3A fit or ANSI B 1.13M of the appropriate thread pitch,
tolerance 4H. The hardened cone shall be as described in Fig. - The lot shall be considered acceptable if the sample nut
withstands application of the proof load without failure.
5 An underline as a marking requirement for grades 2HM and 7M has been
removed but is permitted.
A 194/A 194M – 05a
3 - Dimensions
9.1 Nuts shall be hexagonal in shape, and in accordance
with the dimensions for the hex or heavy hex series, as
required, by ANSI B 18.2.2 and ANSI B 18.2.4.6M. Unless
otherwise specified, the American National Standard Heavy
Hex Series shall be used and nuts shall be either double
TABLE 1 Chemical RequirementsA,B,C
Grade
Symbol
Material
UNS
Number
Carbon,
%
Manganese,
%
Phosphorus,
%
Sulfur,D
%
Silicon,
%
Chromium,
%
Nickel,
%
Molybdenum,
%
Titanium,
%
Columbium
and
Tantalum,
%
Nitrogen,
%
Other
Elements,
%
1 carbon 0.15 min 1.00 0.040 0.050 0.40 . . . . . . . . . . . . . . . . . . . . .
2, 2HM,
and 2H
carbon 0.40 min 1.00 0.040 0.050 0.40 . . . . . . . . . . . . . . . . . . . . .
4 carbon,
molybdenum
0.40–0.50 0.70–0.90 0.035 0.040 0.15–0.35 . . . . . . 0.20–0.30 . . . . . . . . . . . .
3 Type 501 0.10 min 1.00 0.040 0.030 1.00 4.0–6.0 . . . 0.40–0.65 . . . . . . . . . . . .
6 Type 410 S41000 0.15 1.00 0.040 0.030 1.00 11.5–13.5 . . . . . . . . . . . . . . . . . .
6F Type 416 S41600 0.15 1.25 0.060 0.15
min
1.00 12.0–14.0 . . . . . . . . . . . . . . . . . .
6F Type
416Se
S41623 0.15 1.25 0.060 0.060 1.00 12.0–14.0 . . . . . . . . . . . . Selenium,
0.15 min
7, 7M Type
4140/
4142/
4145,
4140H,
4142H,
4145H
0.37–0.49 0.65–1.10 0.035 0.04 0.15–0.35 0.75–1.20 . . . 0.15–0.25 . . . . . . . . . . . .
8, 8A Type 304 S30400 0.08 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . . . . . . . . . . . . .
8C, 8CA Type 347 S34700 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . . . . . 10 x
carbon
content,
min
. . . . . .
8M, 8MA Type 316 S31600 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 . . . . . . . . . . . .
8T, 8TA Type 321 S32100 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . . 5 x
(C+N)
min –
0.70
max
. . . . . . . . .
8F, 8FA Type 303 S30300 0.15 2.00 0.20 0.15
min
1.00 17.0–19.0 8.0–10.0 . . . . . . . . . . . . . . .
8F, 8FA Type
303Se
S30323 0.15 2.00 0.20 0.06 1.00 17.0–19.0 8.0–10.0 . . . . . . . . . Selenium,
0.15 min
8P, 8PA Type 305
with
restricted
carbon
S30500 0.08 2.00 0.045 0.030 1.00 17.0–19.0 11.0–13.0 . . . . . . . . . . . . . . .
8N, 8NA Type
304N
S30451 0.08 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . . . . . . . 0.10–0.16
8LN,
8LNA
Type
304LN
S30453 0.030 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . . . . . . . 0.10–0.16
8MN,
8MNA
Type
316N
S31651 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–13.0 2.00–3.00 . . . . . . 0.10–0.16
8MLN,
8MLNA
Type
316LN
S31653 0.030 2.00 0.045 0.030 1.00 16.0–18.0 10.0–13.0 2.00–3.00 . . . . . . 0.10–0.16
8R, 8RAE XM19 S20910 0.06 4.0–6.0 0.045 0.030 1.00 20.5–23.5 11.5–13.5 1.50–3.00 . . . 0.10–0.30 0.20–0.40 Vanadium,
0.10–0.30
8S, 8SA S21800 0.10 7.0–9.0 0.060 0.030 3.5–4.5 16.0–18.0 8.0–9.0 . . . . . . . . . 0.08–0.18
8MLCuN,
8MLCuNA
S31254 S31254 0.020 1.00 0.030 0.010 0.80 19.5–20.5 17.5–18.5 6.0–6.5 . . . . . . 0.18–0.22 Copper,
0.50–1.00
9C, 9CA N08367 N08367 0.030 2.00 0.040 0.030 1.00 20.0-22.0 23.5- 25.5 6.0-7.0 0.18-0.25 Copper
0.75
16 Chromium
Molybdenum
Vanadium
0.36–0.47 0.45–0.70 0.035 0.040 0.15–0.35 0.80–1.15 . . . 0.50–0.65 . . . . . . . . . Vanadium,
0.25–0.35
AluminumB
0.015
A The intentional addition of Bl, Se, Te, and Pb is not permitted except for Grades 6F, 8F, and 8FA, in which Se is specified and required.
B Total aluminum, soluble and insoluble.
C Maximum, unless minimum or range is indicated.
D Because of the degree to which sulfur segregates, product analysis for sulfur over 0.060 % max is not technologically appropriate.
E As described in Specification A 276.
A 194/A 194M – 05a
4
chamfered or have a machined or forged washer face, at the
option of the manufacturer, and, conform to the angularity
requirements of ANSI B 18.2.2 and ANSI B 18.2.4.6M.
9.2 Unless otherwise specified, threads shall be in accordance
with ANSI B 1.1 or ANSI B 1.13M, and shall be gaged
in accordance with ANSI B 1.2 and ANSI B 1.13M as described
in 9.2.1 and 9.2.2.
9.2.1 Nuts up to and including 1 in. nominal size shall be
UNC Series Class 2B fit. Metric nuts up to and including M24
nominal size shall be coarse thread series tolerance 6H.
9.2.2 Nuts over 1 in. nominal size shall be either UNC
Series Class 2B fit or 8 UN Series Class 2B fit. Unless
otherwise specified, the 8 UN series shall be furnished. Metric
nuts over M24 nominal size shall be coarse thread series
tolerance 6H. - Workmanship, Finish, and Appearance
10.1 Nuts shall be free of defects and shall be good
commercial finish.
10.2 If visible surface imperfections in size 1⁄4 through 11⁄2
in. and M6 through M36 and in any grade other than Grade 8
become a matter of issue between the manufacturer and the
purchaser, the cone proof load test described in 8.3 shall be
employed.
10.3 If a scale-free bright finish is required, this shall be
specified on the purchase order. - Retests
11.1 Provisions for retests by the purchaser and his representative
are specified in Supplementary Requirement S2. - Certification
12.1 The producer of nuts shall furnish a certification to the
purchaser or his representative showing the results of the
chemical analysis, macroetch examination (Carbon and Alloy
Steels Only), mechanical tests, and the minimum tempering
temperature for nuts of Grades 2H, 2HM, 3, 4, 6, 6F, 7, and
7M.
12.2 Certification shall also include at least the following:
12.2.1 A statement that the fasteners were manufactured,
sampled, tested and inspected in accordance with the specification
and any supplementary requirements or other requirements
designated in the purchase order or contract and was
found to meet those requirements.
12.2.2 The specification number, year date, and identification
symbol. - Product Marking
13.1 All nuts shall bear the manufacturer’s identification
mark.
13.2 Nuts shall be legibly marked on one face to indicate the
grade and process of the manufacturer, as presented in Table 7.
Marking of wrench flats or bearing surfaces is not permitted
unless agreed upon between manufacturer and purchaser.
13.3 Nuts coated with zinc shall have an asterisk (*) marked
after the grade symbol. Nuts coated with cadmium shall have
a plus sign (+) marked after the grade symbol.
13.4 For purposes of identification marking, the manufacturer
is considered the organization that certifies the fastener
was manufactured, sampled, tested, and inspected in accordance
with the specification and the results have been determined
to meet the requirements of this specification. - Keywords
14.1 bolting; chemical analysis; coated; marking on fasteners;
plated
TABLE 2 Hardness Requirements
Grade and Type
Completed Nuts Sample Nut after Treatment as in 8.1.5
Brinell
Hardness
Rockwell Hardness Brinell
Hardness,
min
Rockwell
Hardness B
C Scale B Scale Scale, min
1 121 min … 70 min 121 70
2 159 to 352 … 84 min 159 84
2H 248 to 327 24 to 35 … 179 89
To 11⁄2 in. or M36, incl 248 to 327 24 to 35 … 179 89
Over 11⁄2 in. or M36 212 to 327 35 max 95 min 147 79
2HM and 7M 159 to 235 … 84 to 99 159 84
3, 4, 7, and 16 248 to 327 24 to 35 … 201 94
6 and 6F 228 to 271 20 to 28 … … …
8, 8C, 8M, 8T, 8F, 8P, 8N, 126 to 300 … 60 to 105 … …
8MN, 8LN, 8MLN, 8MLCuN,
and 9C
126 to 300 … 60 to 105 … …
8A, 8CA, 8MA, 8TA, 126 to 192 … 60 to 90 … …
8FA, 8PA, 8NA, 8MNA, 126 to 192 … 60 to 90 … …
8LNA, 8MLNA, and
8MLCuNA
126 to 192 … 60 to 90 … …
8R, 8RA, 8S, and 8SA 183 to 271 B 88 to C 25 … … …
9C, 9CA 126 to 192 … 60 to 90 … …
A 194/A 194M – 05a
5
TABLE 3 Proof Load Using Threaded Mandrel — Inch Series
NOTE 1—Proof loads are not design loads.
Nominal
Size, in.
Threads
per Inch
Stress Area
in.2
Proof Load, lbfA
Grade 1 Grades 2, 2HM, 6, 6F, 7M Grades 2H, 3, 4, 7, 16
Heavy HexB HexC Heavy HexD HexE Heavy HexF HexG
1⁄4 20 0.0316 4 130 3 820 4 770 4 300 5 570 4 770
5⁄16 18 0.0524 6 810 6 290 7 860 7 070 9 170 7 860
3⁄8 16 0.0774 10 080 9 300 11 620 10 460 13 560 11 620
7⁄16 14 0.1063 13 820 12 760 15 940 14 350 18 600 15 940
1⁄2 13 0.1419 18 450 17 030 21 280 19 160 24 830 21 280
9⁄16 12 0.182 23 660 21 840 27 300 24 570 31 850 27 300
5⁄8 11 0.226 29 380 27 120 33 900 30 510 39 550 33 900
3⁄4 10 0.334 43 420 40 080 50 100 45 090 58 450 50 100
7⁄8 9 0.462 60 060 55 440 69 300 62 370 80 850 69 300
1 8 0.606 78 780 72 720 90 900 81 810 106 000 90 900
11⁄8 8 0.790 102 700 94 800 118 500 106 700 138 200 118 500
11⁄4 8 1.000 130 000 120 000 150 000 135 000 175 000 150 000
13⁄8 8 1.233 160 200 148 000 185 000 166 500 215 800 185 000
11⁄2 8 1.492 194 000 170 040 223 800 201 400 261 100 223 800
All Types of Grade 8, Grades 9C and 9CA
Heavy HexH HexI
1⁄4 20 0.0316 2 540 2 380
5⁄16 18 0.0524 4 190 3 930
3⁄8 16 0.0774 6 200 5 810
7⁄16 14 0.1063 8 500 7 970
1⁄2 13 0.1419 11 350 10 640
9⁄16 12 0.182 14 560 13 650
5⁄8 11 0.226 18 080 16 950
3⁄4 10 0.334 26 720 25 050
7⁄8 9 0.462 36 960 34 650
1 8 0.606 48 480 45 450
11⁄8 8 0.790 63 200 59 250
11⁄4 8 1.000 80 000 75 000
13⁄8 8 1.233 98 640 92 450
11⁄2 8 1.492 119 360 111 900
A See limit for proof load test in 8.2.2.1. The proof load for jam nuts shall be 46 % of the tabulated load.
B Based on proof stress of 130 000 psi.
C Based on proof stress of 120 000 psi.
D Based on proof stress of 150 000 psi.
E Based on proof stress of 135 000 psi.
F Based on proof stress of 175 000 psi.
G Based on proof stress of 150 000 psi.
H Based on proof stress of 80 000 psi.
I Based on proof stress of 75 000 psi.
A 194/A 194M – 05a
6
TABLE 4 Proof Load Using Threaded Mandrel — Metric
NOTE 1—Proof loads are not design loads.
Nominal
Size,
mm
Threads
Pitch
Stress Area
mm2
Proof Load, kNA
Grade 1 Grades 2, 2HM, 6, 6F, 7M Grades 2H, 3, 4, 7, 16
Heavy HexB HexC Heavy HexD HexE Heavy HexF HexG
M6 1.0 20.1 18.0 16.6 20.8 18.7 29.2 20.8
M8 1.25 36.6 32.8 30.2 37.9 34.0 44.1 37.9
M10 1.50 58.0 51.9 47.9 60.0 53.9 69.9 60.0
M12 1.75 84.3 75.5 69.5 87.3 78.4 101.6 87.3
M14 2.0 115.0 102.9 94.9 119.0 107.0 138.6 119.0
M16 2.0 157.0 140.5 129.5 162.5 146.0 189.2 162.5
M20 2.5 245.0 219.3 202.1 253.6 227.8 295.2 253.6
M22 2.5 303.0 271.2 249.9 313.6 281.8 365.1 313.6
M24 3.0 353.0 315.9 291.2 365.4 328.3 425.4 365.4
M27 3.0 459.0 411.0 378.7 475.1 426.9 553.4 475.1
M30 3.5 561.0 502.1 462.8 580.6 521.7 676.0 580.6
M36 4.0 817.0 731.2 674.0 845.6 759.8 984.5 845.6
All Types of Grade 8, and
Grades 9C and 9CA
Nominal Size, mm Thread Pitch Stress
Area,
mm2
Heavy HexH HexI
M6 1.0 20.1 11.1 10.4
M8 1.25 36.6 20.1 18.8
M10 1.50 58.0 31.9 29.9
M12 1.75 84.3 46.4 43.4
M14 2.0 115.0 63.3 59.2
M16 2.0 157.0 86.4 80.9
M20 2.5 245.0 134.8 126.2
M22 2.5 303.0 166.7 156.0
M24 3.0 353.0 194.2 181.8
M27 3.0 459.0 252.5 236.4
M30 3.5 561.0 308.6 288.9
M36 4.0 817.0 449.4 420.8
A See limit for proof load test in 8.2.2.1. The proof load for jam nuts shall be 46 % of the tabulated load.
B Based on proof stress of 895 MPa.
C Based on proof stress of 825 MPa.
D Based on proof stress of 1035 MPa.
E Based on proof stress of 930 MPa.
F Based on proof stress of 1205 MPa.
G Based on proof stress of 1035 MPa.
H Based on proof stress of 550 MPa.
I Based on proof stress of 515 MPa.
A 194/A 194M – 05a
7
TABLE 5 Proof Load Using 120° Hardened Steel Cone — InchA
Nominal
Size, in.
Threads
per Inch
Stress Area
in.2
Proof Load, lbf
Grade 1 Grades 2, 2HM, 6, 6F, 7M Grades 2H, 3, 4, 7, 16
Heavy HexB HexC Heavy HexD HexE Heavy HexF HexD
1⁄4 20 0.0318 3 800 3 550 4 400 4 000 5 150 4 400
5⁄16 18 0.0524 6 150 5 700 7 100 6 400 8 300 7 100
3⁄8 16 0.0774 8 950 8 250 10 300 9 300 12 000 10 300
7⁄16 14 0.1063 12 000 11 100 13 850 12 450 16 150 13 850
1⁄2 13 0.1419 15 700 14 500 18 100 16 300 21 100 18 100
9⁄16 12 0.182 19 650 18 150 22 700 20 400 26 500 22 700
5⁄8 11 0.226 23 900 22 050 27 550 24 800 32 150 27 550
3⁄4 10 0.334 33 650 31 050 38 850 34 950 45 300 38 850
7⁄8 9 0.462 44 300 40 900 51 100 46 600 59 650 51 100
1 8 0.606 55 150 50 900 63 650 57 300 74 250 63 650
11⁄8 8 0.790 68 000 62 800 78 500 70 650 91 600 78 500
11⁄4 8 1.000 81 250 75 000 93 750 84 400 109 350 93 750
13⁄8 8 1.233 94 250 86 950 108 750 97 800 126 850 108 750
11⁄2 8 1.492 106 700 98 500 123 100 110 800 143 600 123 100
A Based upon the following equation (this equation cannot be used for extrapolating values beyond the size ranges listed in this table):
CPL 5 ~1 2 0.30D! 3 f 3 As
where:
CPL = cone stripping proof load lbf,
D = nominal diameter of nut, in.,
f = minimum proof stress of nut, psi; see footnote b, c, d, e, and f,
As = tensile stress area of nut, in.2 = 0.7854 [D – 0.9743/n]2, and
n = threads per inch.
B Based on proof stress of 130 000 psi.
C Based on proof stress of 120 000 psi.
D Based on proof stress of 150 000 psi.
E Based on proof stress of 135 000 psi.
F Based on proof stress of 175 000 psi.
TABLE 6 Proof Load Using 120° Hardened Steel Cone — MetricA
Nominal
Size, mm
Thread
Pitch
Stress Area
mm2
Proof Load, kN
Grade 1 Grades 2, 2HM, 6 6F, 7M Grades 2H, 3, 4, 7, 16
Heavy HexB HexC Heavy HexD HexE Heavy HexF HexD
M6 1.0 20.1 16.9 15.4 19.3 17.3 22.5 19.3
M8 1.25 36.6 29.6 27.3 34.2 30.8 39.9 34.2
M10 1.50 58.0 45.7 42.1 52.8 47.5 61.5 52.8
M12 1.75 84.3 64.6 59.5 74.7 67.1 86.9 74.7
M14 2.0 115.0 85.6 78.9 99.0 88.9 115.3 99.0
M16 2.0 157.0 113.5 104.7 131.2 118.0 152.9 131.2
M20 2.5 245.0 166.6 153.6 192.7 173.2 224.4 192.7
M22 2.5 303.0 199.6 183.9 230.8 207.4 268.7 230.8
M24 3.0 353.0 224.9 207.4 260.1 233.7 302.9 260.1
M27 3.0 459.0 277.7 256.0 321.1 288.6 373.9 321.1
M30 3.5 561.0 321.3 296.2 371.6 334.0 432.6 371.6
M36 4.0 817.0 415.3 382.8 480.3 431.6 559.2 480.3
A Based upon the following equation (this equation cannot be used for extrapolating values beyond the size ranges listed in this table):
CPL 5 ~1 2 0.012D! 3 f 3 As 3 0.001
where:
CPL = cone stripping proof load lbf [kN],
D = nominal diameter of nut, in. [mm],
f = minimum proof stress of nut, psi [MPa]; see footnote b, c, d, e, and f,
As = tensile stress area of nut, mm2 = 0.7854 [D – 0.9382P]2, and
n = thread pitch, mm.
B Based on proof stress of 895 MPa.
C Based on proof stress of 825 MPa.
D Based on proof stress of 1035 MPa.
E Based on proof stress of 930 MPa.
F Based on proof stress of 1205 MPa.
A 194/A 194M – 05a
8
FIG. 1 Application of Hardened Steel Cone to Testing of Nuts
FIG. 2 Hardened Steel Cone
TABLE 7 Marking of Nuts
Grade and
Type
Nuts Hot-
Forged or
Cold-
Punched
Nuts Machined
from Bar
Stock
Nuts Manufactured
in
Accordance
with 6.6
1 1 1B …
2 2 2B …
2HA 2H 2HB …
2HMA 2HM 2HMB …
3 3 3B …
4 4 4B …
4LB 4L 4BL . . .
6 6 6B . . .
6F 6F 6FB …
7 7 7B …
7LB 7L 7BL …
7MA 7M 7MB …
8 8 8B 8A
8C 8C 8CB 8CA
8M 8M 8MB 8MA
8T 8T 8TB 8TA
8F 8F 8FB 8FA
8P 8P 8PB 8PA
8N 8N 8NB 8NA
8MN 8MN 8MNB 8MNA
8R 8R 8RB 8RA
8S 8S 8SB 8SA
8LN 8LN 8LNB 8LNA
8MLN 8MLN 8MLNB 8MLNA
8MLCuN 8MLCuN 8MLCuNB 8MLCuNA
9C 9C 9CB 9CA
16 16 16B
A The letters H and M indicate heat-treated nuts (see Section 6).
B See Supplementary Requirement S3.
A 194/A 194M – 05a
9
SUPPLEMENTARY REQUIREMENTS
One or more of the following supplementary requirements shall be applied only when specified by
the purchaser in the inquiry, contract, or order. Details of these supplementary requirements shall be
agreed upon in writing by the manufacturer and purchaser. Supplementary requirements shall in no
way negate any requirement of the specification itself.
S1. Strain-Hardened Austenitic Steel Nuts
S1.1 Strain hardened Grades 8, 8C, 8T, 8M, 8F, 8P, 8N, or
8MN nuts may be specified. When Supplementary Requirement
S1 is invoked in the order, nuts shall be machined from
cold drawn bars or shall be cold forged to shape. No subsequent
heat treatment shall be performed on the nuts. Nuts made
in accordance with this requirement shall be proof load tested
in accordance with 8.2.2.1 and shall withstand the proof load
specified in Table 8 and Table 9. Testing nuts requiring proof
loads over 160 000 lbf or 705 kN is only required when
Supplementary Requirement S4 is invoked. The hardness
limits of Table 2 do not apply to strain hardened nuts. Nuts
made in accordance with this requirement shall be marked with
the Grade symbol underlined.
S2. Retests by Purchaser’s Representative
S2.1 The purchaser’s representative may select two nuts per
keg (200-lb unit [90-kg]) for sizes 5⁄8 in. and M16 and smaller,
one nut per keg for sizes over 5⁄8 in. and M16 up to and
including 11⁄2 in. and M36, and one nut per every two kegs for
sizes larger than 11⁄2 in. and M36, which shall be subjected to
the tests specified in Section 8.
S3. Low-Temperature Requirements for Grade 4, Grade
7 or Grade 7M Nuts
S3.1 When low-temperature requirements are specified for
Grade 4 or Grade 7 nuts, the Charpy test procedures and
requirements as defined in Specification A 320/A 320M for
Grade L7 shall apply. When low-temperature requirements are
specified for Grade 7M nuts, the Charpy test procedures and
requirements as defined in Specification A 320/A 320M for
Grade L7M shall apply. Depending on the size of nuts, separate
test samples of the same heat may be required and shall be
processed through heat treatment with the nuts for which the
test is to apply. Impact testing is not required when the bar
stock or nut is smaller than 5⁄8 in. in diameter or 16M in
diameter.
S3.2 An“ L” shall be added to the marking, as shown in
Table 7, for nuts so tested.
S4. Proof Load Tests of Large Nuts
S4.1 Proof load testing of nuts requiring proof loads of over
160 000 lbf or 705 kN is required. Testing shall be performed
in accordance with 8.2 to the loads required in Table 10 and
Table 11. The maximum load will be based entirely on the
equipment available.
S5. Control of Product by Heat Number
S5.1 When control of nuts by actual heat analysis is
required and this supplementary requirement is specified, the
manufacturer shall identify the completed nuts in each shipment
by the actual heat number. When this supplementary
requirement is specified, a certificate including the results of
TABLE 8 Proof Load Testing of Strain Hardened Nuts Using Threaded Mandrel — Inch Series
NOTE 1—Proof loads are not design loads.
Proof Load, lbfA
Nominal
Size, in.
Threads
per in.
Stress Area,
in.2
Grade 8M
(strain hardened)
Grade 8M
(strain hardened)
All Other Types
of Grade 8
(strain hardened)
All Other Types
of Grade 8
(strain hardened)
Heavy HexB HexC Heavy HexD HexB
1⁄4 20 0.0316 3 480 3 160 3 950 3 480
5⁄16 18 0.0523 5 760 5 240 6 550 5 760
3⁄8 16 0.0774 8 510 7 740 9 675 8 510
7⁄16 14 0.1063 11 690 10 630 13 290 11 690
1⁄2 13 0.1419 15 610 14 190 17 740 15 610
9⁄16 12 0.182 20 020 18 200 22 750 20 020
5⁄8 11 0.226 24 860 22 600 28 250 24 860
3⁄4 10 0.334 36 740 33 400 41 750 36 740
7⁄8 9 0.462 46 200 41 580 53 130 46 200
1 8 0.606 60 600 54 540 69 690 60 600
11⁄8 8 0.790 75 050 67 150 82 950 75 050
11⁄4 8 1.000 95 000 85 000 105 000 95 000
13⁄8 8 1.233 110 970 98 640 123 300 110 970
11⁄2 8 1.492 134 280 119 360 149 200 134 280
A The proof load for jam nuts shall be 46 % of the tabulated value.
B Based on proof stress of 110 000 psi up to 3⁄4 in.; 100 000 psi 7⁄8 to 1 in.; 95 000 psi 11⁄8 to 11⁄4 in.; 90 000 psi 13⁄8 to 11⁄2 in.
C Based on proof stress of 100 000 psi up to 3⁄4 in.; 90 000 psi 7⁄8 to 1 in.; 85 000 psi 11⁄8 to 11⁄4 in.; 80 000 psi 13⁄8 to 11⁄2 in.
D Based on proof stress of 125 000 psi up to 3⁄4 in.; 115 000 psi 7⁄8 to 1 in.; 105 000 psi 11⁄8 to 11⁄4 in.; 100 000 psi 13⁄8 to 11⁄2 in.
A 194/A 194M – 05a
10
the actual production tests of each test lot together with the heat
chemical analysis shall be furnished by the manufacturer.
S6. Grain Size Requirements for Non H Grade
Austenitic Steels Used Above 1000 °F
S6.1 For design metal temperatures above 1000 °F [540
°C], the material shall have a grain size of No. 7 or coarser as
determined in accordance with Test Methods E 112. The grain
size so determined shall be reported on the Certificate of Test.
TABLE 9 Proof Load Testing of Strain Hardened Nuts Using Threaded Mandrel — Metric
NOTE 1—Proof loads are not design loads.
Proof Load, kNA
Nominal
Size, mm
Thread
Pitch
Stress Area,
mm2
Grade 8M
(strain hardened)
Grade 8M
(strain hardened)
All Other Types
of Grade 8
(strain hardened)
All Other Types
of Grade 8
(strain hardened)
Heavy HexB HexC Heavy HexD HexB
M6 1.0 20.1 15.3 13.9 17.3 15.3
M8 1.25 36.6 27.8 25.3 31.3 27.8
M10 1.50 58.0 44.1 40.0 49.9 44.1
M12 1.75 84.3 64.1 58.2 72.5 64.1
M14 2.0 115.0 87.4 79.4 98.9 87.4
M16 2.0 157.0 119.3 108.3 135.0 119.3
M20 2.5 245.0 186.2 169.0 210.9 186.2
M22 2.5 303.0 209.0 187.9 240.9 209.0
M24 3.0 353.0 243.5 218.9 280.6 243.5
M27 3.0 459.0 300.6 268.5 332.7 300.6
M30 3.5 561.0 367.5 328.2 406.7 367.5
M36 4.0 817.0 506.5 449.4 563.7 506.5
A The proof load for jam nuts shall be 46 % of the tabulated value.
B Based on proof stress of 760 MPa up to M20 mm; 690 MPa M22 to M24 mm; 655 MPa M27 to M30; and 620 MPa for M36.
C Based on proof stress of 690 MPa up to M20 mm; 620 MPa M22 to M24 mm; 585 MPa M27 to M30; and 550 MPa for M36.
D Based on proof stress of 860 MPa up to M20 mm; 795 MPa M22 to M24 mm; 725 MPa M27 to M30 mm; and 690 MPa for M36.
TABLE 10 Proof Load for Large Heavy Hex Nuts — InchA
Nominal
Size, in.
Threads
per in.
Stress Area,
in.2
Proof Load, lbfB
Grade 1 Heavy Hex
Grades 2, 2HM, 6, 6F, 7M
Heavy Hex
Grades 2H, 3, 4, 7, 16
Heavy Hex
15⁄8 8 1.78 231 400 267 000 311 500
13⁄4 8 2.08 270 400 312 000 364 000
17⁄8 8 2.41 313 300 361 500 421 800
2 8 2.77 360 100 415 500 484 800
21⁄4 8 3.56 462 800 534 000 623 000
21⁄2 8 4.44 577 200 666 000 777 000
23⁄4 8 5.43 705 900 814 500 950 250
A ANSI B 18.2.2 in the size range over 11⁄2 in. provides dimensions only for heavy hex nuts. Refer to 8.3.1.
B Proof loads for nuts of larger dimensions or other thread series may be calculated by multiplying the thread stress area times the proof stress in the notes to Table
3 or Table 8. The proof load for jam nuts shall be 46 % of the tabulated load.
TABLE 11 Proof Load for Large Heavy Hex Nuts — MetricA
Nominal
Size,
mm
Thread
Pitch
Stress Area,
mm2
Proof Load, kNB
Grade 1 Heavy Hex
Grades 2, 2HM, 6, 6F, 7M
Heavy Hex
Grades 2H, 3, 4, 7, 16
Heavy Hex
M42 4.5 1120 1002.4 1159.2 1349.6
M48 5 1470 1315.7 1521.4 1771.4
M56 5.5 2030 1816.9 2101.0 2446.2
M64 6 2680 2398.6 2773.8 3229.4
M72 6 3460 3096.7 3581.1 4169.3
A ANSI B 18.2.4.6M in the size range over M36 provides dimensions only for heavy hex nuts. Refer to 7.3.1.
B Proof loads for nuts of larger dimensions or other thread series may be calculated by multiplying the thread stress area times the proof stress in the notes to Table
4 or Table 9. The proof load for jam nuts shall be 46 % of the tabulated load.
A 194/A 194M – 05a
11
APPENDIXES
(Nonmandatory Information)
X1. STRAIN HARDENING OF AUSTENITIC STEELS
X1.1 Strain hardening is the increase in strength and
hardness that results from plastic deformation below the
recrystallization temperature (cold work). This effect is produced
in austenitic stainless steels by reducing oversized bars
to the desired final size by cold drawing or other process. The
degree of strain hardening achievable in any alloy is limited by
its strain hardening characteristics. In addition, the amount of
strain hardening that can be produced is further limited by the
variables of the process, such as the total amount of crosssection
reduction, die angle and bar size. In large diameter bars,
for example, plastic deformation will occur principally in the
outer regions of the bar, so that the increased strength and
hardness due to strain hardening is achieved predominantly
near the surface of the bar. That is, the smaller the bar, the
greater the penetration of strain hardening. Thus, the mechanical
properties of a given strain hardened fastener are dependent
not just on the alloy, but also on the size of bar from which it
is machined.
X2. COATINGS AND APPLICATION LIMITS
X2.1 Use of coated fasteners at temperatures above approximately
one-half the melting point (Fahrenheit or Celsius)
of the coating is not recommended unless consideration is
given to the potential for liquid and solid metal embrittlement,
or both. The melting point of elemental zinc is approximately
780 °F [415 °C]. Therefore, application of zinc coated fasteners
should be limited to temperatures less than 390 °F [210 °C].
The melting point of cadmium is approximately 600 °F [320
°C]. Therefore, application of cadmium coated fasteners should
be limited to temperatures less than 300 °F [160 °C].
SUMMARY OF CHANGES
Committee A01 has identified the location of selected changes to this specification since the last issue,
A 194/A 194M – 05, which may impact the use of this specification. (Approved September 15, 2005)
(1) Increased proof load requirement in 8.2.2.1, Supplementary
Requirement S1, Supplementary Requirement S4, Table 10,
and Table 11.
Committee A01 has identified the location of selected changes to this specification since the last issue,
A 194/A 194M – 04a, which may impact the use of this specification. (Approved July 1, 2005)
(1) Added Note A that excludes the zinc and cadmium coated
nuts from the requirements of 8.1.5.
(2) The second part of 13.2 was moved into new paragraph
13.3 and subsequent paragraphs were renumbered.
Committee A01 has identified the location of selected changes to this specification since the last issue,
A 194/A 194M – 04, which may impact the use of this specification. (Approved July 1, 2004)
(1) Added the heading “Type” to 3.1.4. (2) Added new Section 7, Chemical Composition.
Committee A01 has identified the location of selected changes to this specification since the last issue,
A 194/A 194M – 03b, which may impact the use of this specification. (Approved January 1, 2004)
(1) Revised 7.1.3 and Table 2 hardness and marking for Grades
2HM and 7M.
A 194/A 194M – 05a
12
A 194/A 194M – 05a
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