By Authority OfTHE UNITED STATES OF AMERICA

Legally Binding Document

By the Authority Vested By Part 5 of the United States Code 552(a) and Part 1 of the Code of Regulations 51 the attached document has been duly INCORPORATED BY REFERENCE and shall be considered legally binding upon all citizens and residents of the United States of America. HEED THIS NOTICE: Criminal penalties may apply for noncompliance.

Official Incorporator:THE EXECUTIVE DIRECTOROFFICE OF THE FEDERAL REGISTERWASHINGTON, D.C.

Document Name:

CFR Section(s):

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e

carlTypewritten TextASTM A307: Carbon Steel Bolts and Studs, 60,000 PSI Tensile Strength

carlTypewritten Text46 CFR 56.25-20(b)

carlTypewritten TextAmerican Society for Testing and Materials

Standard Specification for CARBON STEEL EXTERNALLY THREADED STANDARD FASTENERS1

This standard is issued under the flxed designation A 307; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year oflast revision. A number in parentheses indicates the year oflast reapproval.

'NOTE-Table 3, which was incorrectly retained at last revision, was editorially deleted and Table 4 renumbered to Table 3 in November 1979.

1. Scope 1.1 This specification2 covers the chemical

and mechanical requirements of two grades of carbon steel externally threaded standard fas-teners, in sizes 1/4 in. (6.35 mm) through 4 in. (104 mm). This specification does not cover requirements for externally threaded fas-teners having heads with slotted or recessed drives or for mechanical expansion anchors. The fasteners covered by this specification are frequently used for the following applications:

1.1.1 Grade A Bolts, for general applica-tions, and

1.1.2 Grade B Bolts, for flanged joints in piping systems where one or both flanges are cast iron.

1.2 If no grade is specified in the inquiry, contract, or order, Grade A bolts shall be furnished. .

1.3 NQnheaded anchor bolts, either straight or bent, to be used for structural anchorage purposes, shall conform to the requirements of Specification A 36 with tension tests to be made on the bolt body or on the bar stock used for making the anchor bolts.

1.4 Suitable nuts are covered in Specifica-tion A 563. Unless otherwise specified, the grade and style of nut for each grade of fastener, of all surface finishes, shall be as follows:

Fastener Grade and 'Size A, '/. to l'lz in. A, over l'lz to 4 in. B, '/. to 4 in.

Nut Grade and Style" A, hex A, heavy hex A, heavy hex

" Nuts of other grades and styles having specified proof load stresses (Specification A 563, Table 3) greater than the specified grade and style of nut are also suitable.

261

NOTE-The values stated in inch-pound units are to be regarded as the standard.

2. Applicable Documents 2.1 ASTM Standards: A 36 Specification for Structural SteeP A 153 Specification for Zinc Coating (Hot-

Dip) on Iron and Steel Hardware4 A 370 Methods and Definitions for Me-

chanical Testing of Steel Products7 A 563 Specification for Carbon and Alloy

Steel Nuts5 B 454 Specification for Mechanically De-

posited Coatings of Cadmium and Zinc on Ferrous Metals6

2.2 American National Standards: 8 ANSI B 1.1 Unified Screw Threads ANSI BI8.2.1 Square and Hex Bolts and

Screws

3. Materials and Manufacture 3.1 Steel for bolts shall be made by the

open-hearth, basic-oxygen, or electric-furnace. process.

, This specification is under the jurisdiction of ASTM Committee F-16 on Fasteners, and is the direct responsi-bility of Subcommittee F 16.02 on Steel Bolting.

Current edition approved Oct. 27, 1978. Published December 1978. Originally published as A 307 - 47 T. Last previous edition A 307 - 76 b.

2 For ASME Boiler and Pressure Vessel Code applica-tions see related Specification SA-307 in Section II of that Code.

:l Annual Book of ASTM Standards, Part 4. 4 Annual Book of ASTM Standards, Part 3. 5 Annual Book of ASTM Standards, Parts 1 and 4. "Annual Book ofASTM Standards, Parts 4 and 9. 1 Annual Book of ASTM Standards, Parts 1, 2, 3,4,5,

and 10. B May be obtained from American National Standards

Institute, Inc., 1430 Broadway, New York, N. Y.10018.

Standard Specification for CARBON STEEL EXTERNALLY THREADED STANDARD FASTENERS1

This standard is issued under the flxed designation A 307; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year oflast revision. A number in parentheses indicates the year oflast reapproval.

'NOTE-Table 3, which was incorrectly retained at last revision, was editorially deleted and Table 4 renumbered to Table 3 in November 1979.

1. Scope 1.1 This specification2 covers the chemical

and mechanical requirements of two grades of carbon steel externally threaded standard fas-teners, in sizes 1/4 in. (6.35 mm) through 4 in. (104 mm). This specification does not cover requirements for externally threaded fas-teners having heads with slotted or recessed drives or for mechanical expansion anchors. The fasteners covered by this specification are frequently used for the following applications:

1.1.1 Grade A Bolts, for general applica-tions, and

1.1.2 Grade B Bolts, for flanged joints in piping systems where one or both flanges are cast iron.

1.2 If no grade is specified in the inquiry, contract, or order, Grade A bolts shall be furnished. .

1.3 NQnheaded anchor bolts, either straight or bent, to be used for structural anchorage purposes, shall conform to the requirements of Specification A 36 with tension tests to be made on the bolt body or on the bar stock used for making the anchor bolts.

1.4 Suitable nuts are covered in Specifica-tion A 563. Unless otherwise specified, the grade and style of nut for each grade of fastener, of all surface finishes, shall be as follows:

Fastener Grade and 'Size A, '/. to l'lz in. A, over l'lz to 4 in. B, '/. to 4 in.

Nut Grade and Style" A, hex A, heavy hex A, heavy hex

" Nuts of other grades and styles having specified proof load stresses (Specification A 563, Table 3) greater than the specified grade and style of nut are also suitable.

261

NOTE-The values stated in inch-pound units are to be regarded as the standard.

2. Applicable Documents 2.1 ASTM Standards: A 36 Specification for Structural SteeP A 153 Specification for Zinc Coating (Hot-

Dip) on Iron and Steel Hardware4 A 370 Methods and Definitions for Me-

chanical Testing of Steel Products7 A 563 Specification for Carbon and Alloy

Steel Nuts5 B 454 Specification for Mechanically De-

posited Coatings of Cadmium and Zinc on Ferrous Metals6

2.2 American National Standards: 8 ANSI B 1.1 Unified Screw Threads ANSI BI8.2.1 Square and Hex Bolts and

Screws

3. Materials and Manufacture 3.1 Steel for bolts shall be made by the

open-hearth, basic-oxygen, or electric-furnace. process.

, This specification is under the jurisdiction of ASTM Committee F-16 on Fasteners, and is the direct responsi-bility of Subcommittee F 16.02 on Steel Bolting.

Current edition approved Oct. 27, 1978. Published December 1978. Originally published as A 307 - 47 T. Last previous edition A 307 - 76 b.

2 For ASME Boiler and Pressure Vessel Code applica-tions see related Specification SA-307 in Section II of that Code.

:l Annual Book of ASTM Standards, Part 4. 4 Annual Book of ASTM Standards, Part 3. 5 Annual Book of ASTM Standards, Parts 1 and 4. "Annual Book ofASTM Standards, Parts 4 and 9. 1 Annual Book of ASTM Standards, Parts 1, 2, 3,4,5,

and 10. B May be obtained from American National Standards

Institute, Inc., 1430 Broadway, New York, N. Y.10018.

3.2 Bolts may be produced by hot or cold" forging of the heads or machining from bar stock.

3.3 Bolt threads may be rolled or cut. 3.4 When specified, galvanjzed bolts shall

be hot-dip zinc coated in accordance with the requirements of Class C of Specification A 153. When specified by the purchaser to be

mech~niCally galvari:izM,boIts~,o'yered by this specification shall be mechanically zinc coated and the coating and coated fasteners shall conform to the requirements for Class 50 of

,'$pecification B 454.!

~~r~ A 307 machine oil to prevent galling and damage to the gage. These inspections, when performed to resolve disputes, shall be performed at the frequency and quality described in Table 3.

7. Test Methods 7.1 The material shall be tested in accord-

ance with Supplement III of Methods and A 370.

7.2 Standard square and hexagon bolts only shall be tested by the wedge tension method. Fracture shall be in the body or threads of the bolt without any fracture at the junction of the head and body. Other headed boIts shall be tested by the axial tension method.

7.3 Speed of testing as determined with a free running crosshead shall be a maximum of 1 in. (25.4 mm )/min for the tensile strength tests of bolts.

8. Number of Tests and Retests 8.1 The requirements of this specification

shall be met in continuous mass production for stock, and the manufacturer shall make sample inspections to ensure that the product conforms to the specified requirements. Ad-ditional tests of individual shipments of mate-rial are not ordinarily contemplated. Individ-ual heats of steel are not identified in the finished product.

8.2 When specified in the order, the m~lOufacturer shall furnish a test report certified to be the last completed set of mechanical tests for each stock size in each shipment.

8.3 When additional tests are specified on the purchase order, a lot, for purposes of selecting test samples, shall consist of all material offered for inspection at one time that has the following common characteristics:

8.J.l One type of item. 8.3.2 One nominal size, and 8.3.3 One nominal length of bolts. 8.4 From each lot, the number of tests for

each requirement shall be as follows:

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Number of Pieces in Lot 800 and under 801 to 8 000 8 001 to 22 000 Over 22 000

Number of Samples 1 2 3 5

8.5 If any machined test specimen shows defective machining it may be discarded and another specimen substituted.

8.6 Should any sample fail to meet the requirements of a specified test, double the number of samples from the same lot shall be tested, in wiJich case all of the additional samples shall meet the specification.

9. Marking 9.1 Bolt heads shall be marked (by raised

or depressed mark at the option of the manu-facturer) to identify the manufacturer. The manufacturer may use additional marking for his own use.

10. Inspection 10.1 If the inspection described in 10.2 is

required by the purchaser it shall be specified in the inquiry, order, or contract.

10.2 The inspector representing the pur-chaser shall have free entry., at all times while work on the contract of the purchaser is being performed, to all parts of the manufacturer's works that concern the manufacture of the material ordered. The manufacturer shall af-ford the inspector all reasonable facilities, without charge, to satisfy him that the mate-rial is being furnished in accordance with this specification. All tests (except product analy-sis) and inspection shall be made at the place of manufacture prior to shipment, unless oth-erwise specified, and shall be so conducted as not to interfere unnecessarily with the opera-tion of the works. 11. Rejection

11.1 Unless otherwise specified, any rejec-tion based on tests specified herein shall be reported to the manufacturer within 30 work-ing days from the receipt of samples by the purchaser ..

~~r~ A 307 machine oil to prevent galling and damage to the gage. These inspections, when performed to resolve disputes, shall be performed at the frequency and quality described in Table 3.

7. Test Methods 7.1 The material shall be tested in accord-

ance with Supplement III of Methods and A 370.

7.2 Standard square and hexagon bolts only shall be tested by the wedge tension method. Fracture shall be in the body or threads of the bolt without any fracture at the junction of the head and body. Other headed boIts shall be tested by the axial tension method.

7.3 Speed of testing as determined with a free running crosshead shall be a maximum of 1 in. (25.4 mm )/min for the tensile strength tests of bolts.

8. Number of Tests and Retests 8.1 The requirements of this specification

shall be met in continuous mass production for stock, and the manufacturer shall make sample inspections to ensure that the product conforms to the specified requirements. Ad-ditional tests of individual shipments of mate-rial are not ordinarily contemplated. Individ-ual heats of steel are not identified in the finished product. .

8.2 When specified in the order, the man-ufacturer shall furnish a test report certified to be the last completed set of mechanical tests for each stock size in each shipment.

8.3 When additional tests are specified on the purchase order, a lot, for purposes of selecting test samples, shall consist of all material offered for inspection at one time that has the following common characteristics:

8.J.l One type of item. 8.3.2 One nominal size, and 8.3.3 One nominal length of bolts. 8.4 From each lot, the number of tests for

each requirement shall be as follows:

263

Number of Pieces in Lot 800 and under 801 to 8 000 8 001 to 22 000 Over 22 000

Number of Samples 1 2 3 5

8.5 If any machined test specimen shows defective machining it may be discarded and another specimen substituted.

8.6 Should any sample fail to meet the requirements of a specified test, double the number of samples from the same lot shall be tested, in wiJich case all of the additional samples shall meet the specification. 9. Marking

9.1 Bolt heads shall be marked (by raised or depressed mark at the option of the manu-facturer) to identify the manufacturer. The manufacturer may use additional marking for his own use.

10. Inspection 10.1 If the inspection described in 10.2 is

required by the purchaser it shall be specified in the inquiry, order, or contract.

10.2 The inspector representing the pur-chaser shall have free entry., at all times while work on the contract of the purchaser is being performed, to all parts of the manufacturer's works that concern the manufacture of the material ordered. The manufacturer shall af-ford the inspector all reasonable facilities, without charge, to satisfy him that the mate-rial is being furnished in accordance with this specification. All tests (except product analy-sis) and inspection shall be made at the place of manufacture prior to shipment, unless oth-erwise specified, and shall be so conducted as not to interfere unnecessarily with the opera-tion of the works. 11. Rejection

11.1 Unless otherwise specified, any rejec-tion based on tests specified herein shall be reported to the manufacturer within 30 work-ing days from the receipt of samples by the purchaser ..

TABLE 1 Hardness Requirements for Bolts

Hardness Bolt Size, Grade Brinell RockweIlB in.

min max min max All A 121 241A 69 100A

B 121 ' :212 69 95

A Except when te~ted by wedge terision test.

T4BLE 2 TensiI.e Req!lirements for FuU-Size Bolts Tensile Strength, IbfB

Bolt Threads Stress , (}tade~ Grade; Size, per inch AreaA in. in.2 AandB, Bo,,:,

minc rna 1/4 20 0.0318 1900 3 180 sit. 18 0.0524 3 100 5 240 3/8 t"6 0.0775 4 650 7 750 71i. 14 0.1063 6'350 10 630

liz 13 0.1419 8 500 14 190 It. 12 0.182 11 000 18 200 5/8 11 0.226 J3,.5S0 ?2 600 3/4 10 0.334 20 050 33 400 7/S \I . ,0.462 27 700 46200

8 0.606 36 350 60 600 1'/8 7. 0.'763 45 800 76 300 1'/4 7 0.969 '58 150 erA

13 20 32 50 80

125 200 315

i 2 3 5 7

10 14 21

A Sample sizes of acceptance numbers are extracted from "Single sampling ;Plan for Normal Inspection" Table IIA" MJL-STD-105D.

B Inspect ,all bolts in the lot if the lot size is less than the sample size ..

. " ~ .' 1

) , .' ~ i

II ;!ff;()j;

:'r d1 'r ). . ~ I!. ! i ~ r: '. '( The American Society for Testing and Materials takes no position respecting the validity of any patent righ;; 'a~~erted in

connection with any item mentioned in this standard. Users of this standard are expressly adVised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.

This standard is subject to revision at any time by the responSible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, 1916 Race St., Philadelphia, Pa. 19103, which will schedule a further hearing regarding your comments. Failing satisfaction there, you may appeal to the ASTM Board of Directors.

264