ASTM A307-12 pdf free download.Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength.
This specification2 covers the chemical and mechanical requirements of two grades of carbon steel bolts and studs in sizes 1/4 in. through 4 in.
3. Ordering Information
3.1 Orders for externally threaded fasteners (including nuts and accessories) under this specification shall include the following:
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, or threaded rod.
3.1.3 Grade, that is, A, oi B. 11110 grade is specified. Grade A is furnished.
3.1.4 Quantities (number of pieces by size including nuts),
3.1.5 Fastener size and length,
3.1.6 Washers—Quantity and sue (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 Of/icr Finishes—Specify other protective finish, if required.
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
3.1.11 Specify additional testing (&3) or special requirements.
3.1.12 For establishment of a part identilying system. see ASME B1X.24.
4. Materials and Manufacture
4.1 Steel for bolts, studs, and threaded rod shall he made by the open-hearth. basic-oxygen. or electric-furnace process.
4.2 Bolts shall be produced by hot or cold forging of the heads or machining from bar stock.
4.3 1-feat Treatment:
4.3.1 Cold headed fasteners with head configurations other
than hex having a minimum head height less than or equal to
.5 D (D is nominal diameter) shall be stress relief annealed at
a minimum temperature of 875°F.
4.3.2 Siress relieving of hex head fasteners and those with minimum head heights greater than .5 D shall be at the manufacturer’s option.
4.4 Bolt and stud threads shall be rolled or cut.
4.5 Zinc coatings. Hr—Dip and Mechaizwallv Deposited:
4.5.1 When zinc-coatcd fasteners arc rcquircd, the purchaser shall specify the zinc-coating process, for example hot dip. mechanically deposited. or no preference.
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 Specification F2329.
4.5.3 When mechanically deposited is specified, the fasteners shall he titic-coated by the mechanical-deposition process in accordance with the requirements of Class 55 of Specification B6q5.
6. Mechanical Properties
6.1 Grades A and H bolts, studs, and threaded rod shall conform to the hardness speciFied in Table 2.
6.2 Grade A and 13 bolts, studs, and threaded rod 1½ 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 3. Threaded rod is permitted to he cut to a length suitable for tensile testing and shall be treated using the same method specified for studs.
6.3 Grade A and B bolts, studs, and threaded rod larger than
1½ in. in diameter, other than those excepted in 6.4, shall preferably be tested full size and when equipment of sufficient capacity is available and shall conform to the requirements (or tensile strength specified in Table 3. When equipment of sufficient capacity for full-size testing is not available, or when the length of the bolt or stud makes full-size testing impractical, machined specimens shall he tested and shall conform to the requirements specified 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.