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 Screws Manufacturer in India

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

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