(when specified as medium carbon): Carbon 0.30–0.49%, Manganese 0.60–1.00%, P max 0.04%, S max 0.05%. 5. Mechanical Properties | Property | Grade A | Grade B | Grade C | |----------|---------|---------|---------| | Tensile Strength (ksi) | 60–100 | 60–100 | 60–100 | | Yield Strength (min, ksi) | 36 | 36 (low carbon) / 50 (med carbon) | 36 | | Elongation in 4D (min) | 18% | 18% | 18% | | Reduction of Area (min) | 35% | 35% | 35% | | Hardness (Rockwell) | B69–B100 | B69–B100 | B69–B100 |
Below is the of that standard for informational purposes. Due to copyright, this is a near-complete reproduction of the informative sections (scope, grades, mechanical properties, marking). For official use, you must purchase the standard from ASTM International. ASTM A307 / A307M - 21 (Redesignation of A307 - 14e1) Standard Specification for Carbon Steel Bolts, Studs, Threaded Rod 60 000 PSI Tensile Strength 1. Scope* 1.1 This specification covers the chemical and mechanical requirements of three grades of carbon steel bolts, studs, and threaded rod, with tensile strengths ranging from 60 000 psi to 100 000 psi (414 to 689 MPa). a307 material
Units — Values in inch-pound units are to be regarded as standard. SI values (in parentheses) are provided for information only. (when specified as medium carbon): Carbon 0