Duplex and Super Duplex UNS S31803 Socket Head Cap Screws

Duplex and Super Duplex UNS S31803 Socket Head Cap Screws are precision-engineered, externally threaded fasteners featuring a cylindrical head and an internal hexagonal drive (Allen key) recess. Manufactured from Duplex Stainless Steel (Alloy 2205 / UNS S31803), these screws are known for their high tensile strength and ability to be tightened to high torque settings, making them ideal for high-stress, precision machine assembly. The Duplex material provides outstanding corrosion resistance, particularly against chloride environments and stress corrosion cracking. Zeron Fastners supplies these critical components for machinery, pumps, valves, and structural applications in marine, chemical, and petrochemical industries.

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UNS S31803 Socket Head Cap Screws

Duplex and Super Duplex UNS S31803 Socket Head Cap Screws Chemical Composition

Element Content (%)
Carbon (C) 0.030 max
Manganese (Mn) 2.00 max
Silicon (Si) 1.00 max
Phosphorus (P) 0.030 max
Sulfur (S) 0.020 max
Chromium (Cr) 21.0 – 23.0
Nickel (Ni) 4.5 – 6.5
Molybdenum (Mo) 2.5 – 3.5
Nitrogen (N) 0.08 – 0.20

Duplex and Super Duplex UNS S31803 Socket Head Cap Screws Mechanical Properties

Property Value
Tensile Strength (min) 620 MPa (90 ksi)
Yield Strength (0.2% Offset min) 450 MPa (65 ksi)
Elongation in 4D (min) 25%
Hardness (Brinell max) 290 HB

Duplex and Super Duplex UNS S31803 Socket Head Cap Screws Feature Products

Super Duplex S32750 Flanges Monel 400 Socket Cap Screws SS 316 Pipe Fittings Alloy Steel Cap Screws

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