Description
ASTM A193 B7 THREADED RODS.
ASTM A193 B7 THREADED RODS. AST
ASTM A193 B7 threaded rods to metric and imperial sizes. We offer threaded rods with coarse, fine and extra fine threads to ASME B1.1 and B1.13M standards. These threaded rods are produced to ASME B18.31.3, B18.31.4M, DIN 975 or DIN 976 standards and full compliance to all requirements of ASTM A193 Grade B7 specification.
Specification.
ASTM A193 B7 specification covers requirements for high tensile alloy steel bolting material for use in high temperature or high-pressure service and other special purpose applications. It is a standard specification defining typical chemical composition, mechanical properties, hardness requirement, preferential heat treatment, product marking, certification and other requirements, suitable for bolting used in pressure vessel service, valves, flanges and fittings. ASTM A193 defines both SI (Metric) and inch-pound units.
Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC. Alloy Steel AISI 4140 bar stock or forging stock to produce B7 headed and non-headed bolts. A193 Grade B7 is the most commonly used Bolt specification coupled with A194 Grade 2H Nuts for Bolting Carbon Steel pipeline. A193 B7 bolting is available in metric sizes from M6 to M180 and imperial sizes from 1/4 to 7 inches, in diameter.
ASTM A193 Grade B7 chemical composition, mechanical properties such as tensile strength; yield strength, hardness, marking requirements and reference product standards.
Chemical Composition & Mechanical Properties.
Grade B7 is manufactured from heat-treated chromium-molybdenum low-alloy steel, typically AISI 4140 or 4142. The minimum mechanical properties include:
- Tensile Strength: 125 ksi (860 MPa)
- Yield Strength: 105 ksi (720 MPa)
- Maximum Hardness: 35 HRC
This composition ensures excellent durability, wear resistance, and corrosion resistance, making it a preferred choice for bolting applications in the oil and gas, power generation, and construction industries.
Manufacturing Standards.
Our ASTM A193 B7 threaded rods are produced following stringent industry standards to ensure consistency and reliability. The manufacturing standards include:
- ASME B18.31.3, B18.31.4M – Threaded rods for general and high-pressure applications.
- DIN 975, DIN 976 – Metric threaded rods used in engineering, construction, and machinery industries.
- ASME B1.1, B1.13M – Unified and metric thread standards for accurate thread formation.
ASTM A193 B7 threaded rods Chemical Composition
| Elements | Range | Product Variation, Over or Under B |
| Carbon | 0.37-0.49 % D | 0.02 % |
| Manganese, max | 0.65-1.10 % | 0.04 % |
| Phosphorus, max | 0.035 % | 0.005 % over |
| Sulfur, max | 0.040 % | 0.005 % over |
| Silicon | 0.15 – 0.35 % | 0.02 % |
| Chromium | 0.75-1.20 % | 0.05 % |
| Molybdenum | 0.15-0.25 % | 0.02 % |
