ASTM A193 B16 Hex Head Cap Screws
The ASTM A193 B16 Hex Head Cap Screw is a specialized high-strength fastener used to directly thread into a tapped hole without a nut, common in machine assemblies and heavy component integration subject to extreme operating conditions. Manufactured by Zeron Fasteners, this cap screw utilizes the B16 alloy steel grade (Chromium-Molybdenum-Vanadium), which is specifically engineered for sustained service at extremely high temperatures (above $850^\circ\text{F}$ or $454∘C). The key feature of B16 is its exceptional creep resistance—the ability to maintain strength and shape under prolonged high-temperature stress. These cap screws provide a reliable, high-tensile connection in high-pressure steam turbines, engine components, and specialized equipment where maximum dimensional stability under heat is non-negotiable, offering a robust high-temperature bolting solution for threaded components.
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ASTM A193 B16 Hex Head Cap Screws Chemical Composition
| Element | Composition (% by Mass) |
|---|---|
| Carbon (C) | 0.37 - 0.49 |
| Manganese (Mn) | 0.70 - 1.10 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Silicon (Si) | 0.15 - 0.35 |
| Chromium (Cr) | 0.80 - 1.15 |
| Molybdenum (Mo) | 0.45 - 0.65 |
| Vanadium (V) | 0.25 - 0.35 |
ASTM A193 B16 Hex Head Cap Screws Mechanical Properties
| Property | Minimum Requirement (Grade B16) |
|---|---|
| Tensile Strength, min | 125 ksi (860 MPa) |
| Yield Strength, min (0.2% offset) | 105 ksi (720 MPa) |
| Elongation in 2 in. (50 mm), min | 18% |
| Reduction of Area, min | 50% |
| Hardness, max (Brinell) | 321 HBW |
| Hardness, max (Rockwell) | 35 HRC |