Zeron 100 SA heavy hex nuts are super duplex stainless steel heavy hex nuts (UNS S32760 / Werkstoff 1.4501) in the Solution Annealed supply state. SA is the only correct supply state for nuts, nuts are hot-forged from bar (heated to ~1100°C, upset-forged to hex-blank, then drilled and tapped). Cold-work supply states (FG) cannot be used for nuts because the hot-heading cycle would re-anneal them anyway. Specifying "FG heavy hex nut" means SA-condition nut from heat lots cherry-picked for higher-end mechanical envelope, the supply state is still SA.
SA is the only metallurgically correct supply state for nuts · Hot-forged then SA + tapped · PREN ≥ 40 · Hardness ≤ 28 HRC
Used as the standard companion to SA stud bolts on ANSI Class 150-1500 flanges; pair with FG stud bolts on Class 1500-2500 + NORSOK / API 6A high-load joints (the heavy nut pattern handles the SA-vs-FG mismatch through extra thread engagement, see ASME B18.2.4.6M proof-load tables).
Yield 620-720 MPa typ / UTS 800-870 MPa / Hardness body 22-27 HRC / Hardness tapped root 23-27 HRC NACE-controlled / Charpy V-notch -46°C 60-110 J / Ferrite 40-52% / CPT G48-E ≥ 50°C / Proof load per ASTM F606 + ASME B18.2.4.6M.
ASME B18.2.2 (inch heavy hex) + ASME B18.2.4.6M (metric heavy hex M16-M48) + ASTM A1082 + ASTM F606 (proof load) + ASME B1.1 (thread tolerance class 2B) + NACE MR0175 + NORSOK M-650 + M-630 MDS 055.
Full SA supply state · All heavy hex nut supply states · Sister supply states for nuts (all SA-base, heat-selected): FG-spec heavy hex nuts, FLT (low-temp Charpy).
Send the spec to info@torqbolt.com / +91-22-66157017 / WhatsApp.
