Zeron 100 SA hex cap screws are super duplex stainless steel fasteners (UNS S32760 / Werkstoff 1.4501) per ASME B18.2.1 precision class, same nominal dimensions as a hex bolt but with tighter under-head bearing-face squareness, head-height variation, and shank concentricity. Used in tapped-hole connections (valve cover bolting, pump bearing housings, equipment frames) where the bearing surface seats against a precision-machined plate face. SA is the right pick for moderate-load applications; FG hex cap screws for high-load NORSOK / API service.
Tighter tolerance class than hex bolts · Precision bearing-face fit · SA standard supply state · PREN ≥ 40
Yield 620-720 MPa / UTS 800-870 MPa / Hardness 22-27 HRC body, ≤ 28 HRC rolled root NACE / Charpy ≥ 60 J at -46°C / Ferrite 40-52% / CPT ≥ 50°C. Standards: ASME B18.2.1 (precision class) + ASTM A1082 + ASTM A479 + NACE MR0175 + NORSOK M-630 MDS 055.
SA cornerstone · All hex cap screw supply states · FG version · FLT version.
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