Sa-307 495y44

SPECIFICATION FOR CARBON STEEL BOLTS AND STUDS, 60,000 PSI TENSILE STRENGTH SA-307 (Identical with ASTM Specification A 307-93a.)

1.

Scope

1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

1.1 This specification covers the chemical and mechanical requirements of three grades of carbon steel bolts and studs in sizes 1⁄4 in. (6.35 mm) through 4 in. (104 mm). The fasteners are designated by “Grade” denoting tensile strength and intended use, as follows: Grade

1.5 Supplementary Requirement S1 of an optional nature is provided, which describes additional restrictions to be applied when bolts are to be welded. It shall apply only when specified in the inquiry, order, and contract.

Description

Grade A

Bolts and studs having a minimum tensile strength of 60 ksi (414 MPa) and intended for general applications, Bolts and studs having a tensile strength of 60 to 100 ksi (414 to 690 MPa) and intended for flanged ts in piping systems with cast iron flanges, and Nonheaded anchor bolts (studs), either bent or straight, having properties conforming to Specification A 36 (tensile strength of 58 to 80 ksi (400 to 550 MPa)) and intended for structural anchorage purposes.

Grade B

Grade C

2.

2.1 ASTM Standards: A 36 Specification for Structural Steel A 153 Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware A 370 Test Methods ad Definitions for Mechanical Testing of Steel Products A 563 Specification for Carbon and Alloy Steel Nuts A 706 /A 706M Specification for Low-Alloy Steel Deformed Bars for Concrete Reinforcement A 751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products B 695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel D 3951 Practice for Commercial Packaging F 606 Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets

1.1.1 The term studs includes stud stock, sometimes referred to as threaded rod. 1.2 This specification does not cover requirements for machine screws, thread cutting /forming screws, mechanical expansion anchors or similar externally threaded fasteners. 1.3 Suitable nuts are covered in Specification 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 1⁄

11⁄

A, C, 4 to 2 in. A, C, over 11⁄2 to 4 in. B, 1⁄4 to 4 in.

Referenced Documents

Nut Grade and StyleA A, hex A, heavy hex A, heavy hex

2.2 ANSI /ASME Standards: B1.1 Unified Screw Threads B18.2.1 Square and Hex Bolts and Screws

A

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.

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2.3 Military Standard: MIL-STD 105 Single Sampling Plan for Normal Inspection

3.

4.4 Bolt and stud threads may be rolled or cut. 4.5 Zinc Coatings, Hot-Dip and Mechanically Deposited: 4.5.1 When zinc-coated fasteners are required, the purchaser shall specify the zinc-coating process, for example hot dip, mechanically deposited, or no preference.

Ordering Information

3.1 Orders for externally threaded fasteners (including nuts and accessories) under this specification shall include the following:

4.5.2 When hot-dip is specified, the fasteners shall be zinc-coated by the hot-dip process in accordance with the requirements of Class C of Specification A 153.

3.1.1 ASTM designation and year of issue, 3.1.2 Name of product, bolts or studs; and bolt head style, that is, hex or heavy hex,

4.5.3 When mechanically deposited is specified, the fasteners shall be zinc-coated by the mechanicaldeposition process in accordance with the requirements of Class 50 of Specification B 695.

3.1.3 Grade, that is, A, or B, or C. If no grade is specified, Grade A is furnished. 3.1.4 Quantities (number of pieces by size including nuts),

4.5.4 When no preference is specified, the supplier may furnish either a hot-dip zinc coating in accordance with Specification A 153, Class C or a mechanically deposited zinc coating in accordance with Specification B 695, Class 50. Threaded components (bolts and nuts) shall be coated by the same zinc-coating process and the supplier’s option is limited to one process per item with no mixed processes in a lot.

3.1.5 Fastener size and length, 3.1.6 Washers — Quantity and size (separate from bolts), 3.1.7 Zinc Coating — Specify the zinc-coating process required for example, hot-dip, mechanically deposited or no preference (see 4.5), 3.1.8 Other Finishes — Specify other protective finish, if required,

5.

5.1 Grade A and B bolts and studs shall conform to the following chemical requirements:

3.1.9 Specify if inspection at point of manufacture is required, 3.1.10 Specify if certified test report is required (see 8.2), and

Phosphorus, max, % Sulfur, max, %

3.1.11 Specify additional testing (8.3) or special requirements.

4.

Chemical Composition

Grade A

Grade B

0.06 0.15

0.04 0.05

5.2 Grade C nonheaded anchor bolts shall conform to the chemical requirements in Specification A 36 for bars. 5.3 Resulfurized material is not subject to rejection based on product analysis for sulfur.

Materials and Manufacture

4.1 Steel for bolts and studs shall be made by the open-hearth, basic-oxygen, or electric-furnace process.

5.4 Bolts and studs are customarily furnished from stock, in which case individual heats of steel cannot be identified.

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

5.5 Application of heats of steel to which bismuth, selenium, tellurium, or lead has been intentionally added shall not be permitted for Grade B bolts and studs.

4.3 Heat Treatment: 4.3.1 Cold headed fasteners with head configurations other than hex shall be stress relief annealed.

5.6 Chemical analyses shall be performed in accordance with Test Methods, Practices, and Terminology A 751.

4.3.2 Hex head fasteners may be stress relieved at the manufacturer’s option. 464

PART A — FERROUS MATERIAL SPECIFICATIONS

6.

Mechanical Properties

563, shall have Class 2A threads before hot-dip or mechanically deposited zinc coating. After zinc coating the maximum limit of pitch and major diameter may exceed the Class 2A limit by the following amount:

6.1 Grades A and B bolts and studs shall conform to the hardness specified in Table 1. 6.2 Grade A and B bolts and studs 11⁄2 in. in diameter or less, other than those excepted in 6.4, shall be tested full size and shall conform to the requirements for tensile strength specified in Table 2.

Diameter, in.

6.3 Grade A and B bolts and studs larger than 11⁄2 in. in diameter, other than those excepted in 6.4, shall preferably be tested full size and when so tested, shall conform to the requirements for tensile strength specified in Table 2. When equipment of sufficient capacity for full-size bolt testing is not available, or when the length of the bolt makes full-size testing impractical, machined specimens shall be tested and shall conform to the requirements specified in Table 3.

1⁄

4

5⁄

16,

7⁄

16,

9⁄

16

7⁄

8

3⁄

Oversize Limit, in. (mm)A

8

1⁄ 2 to 3⁄4 incl

1.0 to 11⁄4 incl 13⁄8, 11⁄2 13⁄4 to 4.0 incl

0.016 0.017 0.018 0.020 0.022 0.024 0.027 0.050

A

These values are the same as the overtapping required for zinc-coated nuts in Specification A 563.

7.4 The gaging limit for bolts and studs shall be verified during manufacture or use by assembly of a nut tapped as nearly as practical to the amount oversize shown above. In case of dispute, a calibrated thread ring gage of that same size (Class X tolerance, gage tolerance plus) shall be used. Assembly of the gage, or the nut described above, must be possible with hand effort following application of light 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 4.

6.4 Grades A and B bolts and studs less than three diameters in length or bolts with drilled or undersize heads are not subject to tensile tests. 6.5 Grade C nonheaded anchor bolts shall be tested using machined specimens and shall conform to the tensile properties specified for bars in Specification A 36. Properties are shown in Table 3 for information. In the event of conflict Specification A 36 shall control. 6.6 In the event that bolts are tested by both full size and by machine test specimen methods, the fullsize test shall govern if a controversy between the two methods exists.

8.

6.7 For bolts and studs on which both hardness and tension tests are performed, acceptance based on tensile requirements shall take precedence in the event that there is controversy over low readings of hardness tests.

7.

SA-307

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. Additional tests of individual shipments of material are not ordinarily contemplated. Individual heats of steel are not identified in the finished product.

Dimensions

7.1 Unless otherwise specified, threads shall be the Coarse Thread Series as specified in the latest issue of ANSI /ASME B1.1, and shall have a Class 2A tolerance.

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

7.2 Unless otherwise specified, Grade A bolts shall be hex bolts with dimensions as given in the latest issue of ANSI /ASME B18.2.1. Unless otherwise specified, Grade B bolts shall be heavy hex bolts with dimensions as given in the latest issue of ANSI /ASME B18.2.1.

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: 8.3.1 One type of item,

7.3 Unless otherwise specified, bolts and studs to be used with nuts or tapped holes which have been tapped oversize, in accordance with Specification A

8.3.2 One nominal size, and 8.3.3 One nominal length of bolts and studs. 465

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8.4 From each lot, the number of tests for each requirement shall be as follows: Number of Pieces in Lot

Number of Samples

800 and under 801 to 8000 8001 to 22 000 Over 22 000

1 2 3 5

requested by the purchaser’s representative shall be made before shipment, and shall be conducted as not to interfere unnecessarily with the operation of the works.

11. 8.5 If any machined test specimen shows defective machining, it may be discarded and another specimen substituted.

11.1 The party responsible for the fastener shall be the organization that supplies the fastener to the purchaser and certifies that the fastener was manufactured, sampled, tested and inspected in accordance with this specification and meets all of its requirements.

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 which case all of the additional samples shall meet the specification.

12. 9.

Test Methods

Rejection and Rehearing

12.1 Material that fails to conform to the requirements of this specification may be rejected. Rejection should be reported to the producer or supplier promptly and in writing. In case of dissatisfaction with the results of the test, the producer or supplier may make claim for a rehearing.

9.1 Grades A and B bolts and studs shall be tested in accordance with Test Methods F 606. 9.2 Grade C nonheaded anchor bolts shall have machined specimen tension tests made on the bolt body or on the bar stock used for making the anchor bolts. Tests on finished anchor bolts shall be made in accordance with Test Methods F 606 and tests on bar stock in accordance with Specification A 36 and Test Methods A 370.

13.

Product Marking

13.1 Bolt heads and one end of studs shall be marked with a unique identifier by the manufacturer to identify the manufacturer or private label distributor, as appropriate. The manufacturer may also use additional marking for his own use.

9.3 Standard square and hex head bolts only shall be tested by the wedge tension method except as noted in 6.4. Fracture shall be in the body or threads of the bolt without any fracture at the junction of the head and body. Other headed bolts shall be tested by the axial tension method.

13.2 In addition to the requirements of 13.1, all bolt heads, one end of studs 3⁄8 in. and larger, and whenever feasible studs less than 3⁄8 in. shall be marked with a grade marking as follows:

9.4 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.

10.

Responsibility

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.

Grade

Marking

A B C

307A 307B 307C

13.3 All markings shall be located on the top of the bolt head or stud end and may be raised or depressed at the option of the manufacturer.

10.2 The inspector representing the purchaser shall have free entry to all parts of the manufacturer’s works that concern the manufacture of the material ordered. The manufacturer shall afford the inspector all reasonable facilities to satisfy him that the material is being furnished in accordance with this specification. All tests and inspections required by the specification that are

13.4 Grade and manufacturer’s or private label distributor’s identification shall be separate and distinct. The two identifications shall preferably be in different locations and, when on the same level, shall be separated by at least two spaces. 466

PART A — FERROUS MATERIAL SPECIFICATIONS

14.

SA-307

Packaging and Package Marking

14.1 Packaging: 14.1.1 Unless otherwise specified, packaging shall be in accordance with Practice D 3951. 14.1.2 When special packaging requirements are required, they shall be defined at the time of the inquiry and order. 14.2 Package Marking: 14.2.1 Each shipping unit shall include or be plainly marked with the following information: 14.2.1.1 ASTM designation and grade, 14.2.1.2 Size, 14.2.1.3 Name and brand or trademark of the manufacturer, 14.2.1.4 Number of pieces, 14.2.1.5 Purchase order number, 14.2.1.6 Country of origin.

15.

Keywords

15.1 bolts; carbon steel; steel; studs

TABLE 1 HARDNESS REQUIREMENTS FOR BOLTS AND STUDS Hardness A Brinell Grade A B C

Length, in. 0 dia B

Less than 3 × 3 × dia and longer Less than 3 × dia B 3 × dia and longer All

Rockwell B

min

max

min

max

121 ... 121 ...

241 69 241 ... 212 69 212 ... No hardness required

100 100 95 95

A

As measured anywhere on the surface or through the cross section. Also bolts with drilled or undersize heads. These sizes and bolts with modified heads shall meet the minimum and maximum hardness as hardness is the only requirement. B

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TABLE 2 TENSILE REQUIREMENTS FOR FULL-SIZE BOLTS AND STUDS Tensile Strength, lbf B Bolt Size, in. 1⁄

4

5⁄

16

3⁄

8

7⁄

16

1⁄

2

9⁄

16

5⁄

8

3⁄

4

7⁄

Stress Area,A in.2

Threads per Inch

Grade B Grade A, min C

min D

max D

20 18 16 14

0.0318 0.0524 0.0775 0.1063

1 900 3 100 4 650 6 350

1 900 3 100 4 650 6 350

3 180 5 240 7 750 10 630

8

13 12 11 10 9

0.1419 0.182 0.226 0.334 0.462

8 500 11 000 13 550 20 050 27 700

8 500 11 000 13 550 20 050 27 700

14 190 18 200 22 600 33 400 46 200

1 11⁄8 11⁄4 13⁄8

8 7 7 6

0.606 0.763 0.969 1.155

36 350 45 800 58 150 69 300

36 350 45 800 58 150 69 300

60 600 76 300 96 900 115 500

11⁄2 13⁄4 2 21⁄4

6 5 41⁄2 41⁄2

1.405 1.90 2.50 3.25

84 300 114 000 150 000 195 000

84 300 114 000 150 000 195 000

140 500 190 000 250 000 325 000

21⁄2 23⁄4 3 31⁄4

4 4 4 4

4.00 4.93 5.97 7.10

240 000 295 800 358 200 426 000

240 000 295 800 358 200 426 000

400 000 493 000 597 000 710 000

31⁄2 33⁄4 4

4 4 4

8.33 9.66 11.08

499 800 579 600 664 800

499 800 579 600 664 800

833 000 966 000 1 108 000

A

Area calculated from the equation:

As p 0.7854 [D − (0.9743/n)] 2 where: As p stress area, D p nominal diameter of bolt, and n p threads per inch. B

1 lbf p 4.448 N. Based on 60 ksi (414 MPa). D Based on 60–100 ksi (414–690 MPa). C

468

PART A — FERROUS MATERIAL SPECIFICATIONS

SA-307

TABLE 3 TENSILE REQUIREMENTS FOR MACHINED SPECIMENS

Tensile strength, ksi (MPa) Yield point, min ksi (MPa) Elongation in 2 in. (50 mm), min, %

Grade A

Grade B

Grade C

60 (415) min ... 18

60–100 (415–690) ... 18

58–80 (400–550) 36 (50) 23

TABLE 4 SAMPLE SIZES AND ACCEPTANCE NUMBERS FOR INSPECTION OF HOT-DIP OR MECHANICALLY DEPOSITED ZINC-COATED THREADS

Lot Size 2 91 151 281 501 1 201 3 201 10 001

Sample Size A,B

Acceptance Number A

13 20 32 50 80 125 200 315

1 2 3 5 7 10 14 21

to 90 to 150 to 280 to 500 to 1 200 to 3 200 to 10 000 and over

A Sample sizes of acceptance numbers are extracted from “Single Sampling Plan for Normal Inspection,” Table IIA, MIL-STD-105. B Inspect all bolts in the lot if the lot size is less than the sample size.

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1998 SECTION II

SUPPLEMENTARY REQUIREMENT The following supplementary requirement shall apply only when specified in the purchase order or contract:

S1.

Carbon Manganese Phosphorus Sulfur Silicon

Bolts Suitable for Welding

S1.1 The material described in this section is intended for welding. This supplemental section, by additional chemical composition restrictions and by a carbon equivalent formula, provides assurance of weldability by chemical composition control.

0.30%, 1.00%, 0.04%, 0.05%, 0.50%,

max max max max max

S1.5.2 Carbon Equivalent (Source — Specification A 706 /A 706M) — In addition to the heat chemical analysis requirements in S1.5.1, the heat analysis shall be such as to provide a carbon equivalent (CE) not exceeding 0.55 when calculated as follows:

S1.2 Welding technique is of fundamental importance when bolts produced to this supplementary section are welded. It is presupposed that suitable welding procedures for the steel being welded and the intended service will be selected.

CE p % C +

S1.3 All of the requirements of this supplemental section apply in addition to all of the chemical, mechanical, and other requirements of the base specification, Specification A 307 for Grade B.

+

S1.4 Because of the embrittling effects of welding temperatures on cold-forged steel, this supplemental section is limited to hot-forged bolts, or, if not forged, then to bolts produced from hot-rolled bars without forging or threaded bars, bars studs, or stud bolts produced from hot-rolled bars without forging. Coldforged bolts, or cold-drawn threaded bars, if they are given a thermal treatment by heating to a temperature of not less than 1500°F (815°C) and air-cooled are also suitable.

% Mn % Cu % Nl + + 6 40 20 % Cr % Mo % V − − 10 50 10

S1.6 Analysis Reports — If requested on the order or contract, the chemical composition of each heat of steel used and the calculated carbon equivalent for each heat shall be reported to the purchaser. S1.7 Product (Check) Verification Analysis — A chemical analysis may be made by the purchaser or his representative from bolts selected from each heat of steel. The analysis thus determined shall not exceed the values specified in S1.5.2 by more than the following amounts. %

S1.5 Chemical Requirements: Carbon Manganese Phosphorus Sulfur Silicon

S1.5.1 Heat Chemical Analysis — Material conforming to the following additional analysis limitations shall be used to manufacture the product described in this supplementary requirement.

470

+0.03 +0.06 +0.008 +0.008 +0.05