Super Duplex Steel Zeron 100 Washers

Super Duplex Steel Zeron 100 Washers — Specifications & Dimensions

Super Duplex Steel Zeron 100 washers distribute clamp load over a wider bearing area. TorqBolt manufactures Super Duplex Steel Zeron 100 washers per ASME B18.21.1 / B18.22.1, DIN 125 / 126 / 127 / 9021, and ISO 7089 / 7090 / 7093 / 7094, in metric (M3–M100) and imperial (#4–4") sizes.

Plain Washer Dimensions

Super Duplex Steel Zeron 100 plain washers are characterized by ID (clearance), OD (load distribution area), and thickness. Standard tolerances h13 on OD, H13 on ID per ISO 286-2; flatness and parallelism 0.05 mm/100 mm verified per lot.

Form Variants

Hardness & Surface

Super Duplex Steel Zeron 100 washers are hardness-controlled to balance load-distribution stiffness against surface damage. Typical Vickers HV: plain 140–180; spring 380–440; Belleville 460–540. Surface finish Ra 1.6 µm or better. EN 10204 3.1 / 3.2 certs standard; NACE MR0175 on request.

Duplex & Super Duplex Stainless Steels

Duplex stainless steels have ~50/50 ferrite-austenite microstructure, doubling yield strength of 304/316 grades while improving chloride pitting resistance.

Duplex 2205 (UNS S32205) is standard with PREN ~35. Super Duplex 2507 (S32750) and Zeron 100 (S32760) push PREN to 41-42. SA-182 F51 / F53 / F55 / F60 are the ASME forged-flange equivalents.

Phase balance is critical: ferrite must stay 35-65% in weld + HAZ (ASTM A923 testing). Solution anneal at 1040-1100°C followed by water quench. Fasteners ship per ASTM A276 / A479 with EN 10204 3.1 / 3.2 certs including ferrite count and Charpy at -46°C.

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