Monel 400 Nuts

Monel 400 Nuts, Specifications & Dimensions

Monel 400 nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures Monel 400 nuts per ASME B18.2.2, ISO 4032/4033/4034, DIN 934/EN 24032, and DIN 6915 (heavy hex), in sizes M6–M100 and 1/4"–4".

Nut Height Categories

Locking Variants

For vibration-loaded joints, Monel 400 nuts are available as nyloc, all-metal prevailing-torque (DIN 980), flange-serrated (DIN 6923), and castle / slotted (DIN 935, cotter-pin retention).

Mechanical & Certification

Monel 400 nut threads are gauged per ASME B1.1 / ISO 965 to Class 2B / 6H. Proof-load testing per ASTM F606 verifies the nut develops the bolt's full strength without thread strip. Each lot ships with EN 10204 3.1 / 3.2 certificates. NACE MR0175 / ISO 15156 sour-service certification available.

Monel, Nickel-Copper Alloys

Monel alloys are 67% Ni / 33% Cu solid-solution alloys distinguished by uniform corrosion resistance in seawater, hydrofluoric acid, alkalis, and salt brines.

Monel 400 (UNS N04400) is the base composition. Monel K-500 (N05500) adds Al + Ti for γ' precipitation hardening, raising yield to ~620 MPa, the standard for high-strength shafting in seawater. Monel R-405 is a free-machining variant.

Monel fasteners are produced per ASTM B164 with EN 10204 3.1 / 3.2 certificates. Galvanic compatibility with copper-nickel piping makes Monel the natural mate for naval, desalination, and salt-evaporator service.

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