ASTM A193 B7 Threaded Rods (Studding)
The ASTM A193 B7 Threaded Rod is one of the most critical alloy steel fasteners used in heavy industry.2 It is essentially a bar of 3$\text{AISI 4140}$ steel, heat-treated (quenched and tempered) to achieve specific mechanical properties, and threaded along its entire length.4 Often referred to as B7 studding, these rods are cut to specific lengths to form stud bolts for joining flanges and equipment in high-pressure and high-temperature environments, particularly in the oil, gas, and petrochemical sectors.5 Zeron Fasteners supplies these certified threaded rods with full traceability, ensuring they meet the stringent tensile strength and temperature stability requirements mandated by the $\text{A193 B7}$ specification.
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ASTM A193 B7 Threaded Rods Chemical Composition
| Specification | Element | Composition (%) |
|---|---|---|
| ASTM A193 B7 (AISI 4140 Alloy Steel) | Carbon (C) | 0.38 - 0.48 |
| Manganese (Mn) | 0.75 - 1.00 | |
| Phosphorus (P) | Max 0.035 | |
| Sulfur (S) | Max 0.040 | |
| Chromium (Cr) | 0.80 - 1.10 | |
| Molybdenum (Mo) | 0.15 - 0.25 |
ASTM A193 B7 Threaded Rods Mechanical Properties
| Specification | Property | Value |
|---|---|---|
| ASTM A193 B7 (Diameter ≤ 4"$) | Tensile Strength, min | 125 ksi (860 MPa) |
| Yield Strength, min | 105 ksi (725 MPa) | |
| Hardness | 248 - 321 HBW (23 - 35 HRC) | |
| Heat Treatment | Condition | Quenched and Tempered |
| Maximum Temperature | $450^{\circ} \text{C}$ ($842^{\circ} \text{F}$) |