ALLOY W Coupling Nuts manufactured at TorqBolt are corrosion resistant,high temperature resistant with ultimate tensile strength.
Dimensional standards as per DIN 439B,DIN 6334,ISO 898-2,DIN 3871,DIN 8434-133 are provided.
The raw material of these fasteners is further classified as super nickel alloys. Being a PED certified Fasteners Manufacturer by TUV Rheinland,our fasteners are accompanied with EN 10204 3.1/3.2 certification. ALLOY W Coupling Nuts are available in hot forged,cold forged and bar stock machined conditions depending upon the order quantity.
Alloy W Coupling Nuts — Specifications & Dimensions
Alloy W Coupling nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures Alloy W Coupling 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
Standard / regular hex nut — ~0.875×D height, ASME B18.2.2 Type 1
Heavy hex nut — ~D height, full strength matched to bolt grade (A194 2H pattern)
Jam / thin nut — 0.5×D height, used as locknut against a primary nut
Coupling nut — long-form for joining two threaded rods
Cap / acorn nut — closed-end, decorative + thread protection
Locking Variants
For vibration-loaded joints, Alloy W Coupling nuts are available as nyloc (polymer insert), all-metal prevailing-torque (DIN 980, distorted-thread style), flange-serrated (DIN 6923, integral washer face with anti-back-off teeth), and castle / slotted (DIN 935, cotter-pin retention). Each locking style trades reusability against prevailing-torque retention.
Thread & Mechanical
Alloy W Coupling nut threads are gauged per ASME B1.1 / ISO 965 to Class 2B / 6H by default; high-strength variants use 3B / 4H6H. Proof-load testing per ASTM F606 verifies the nut can develop the bolt's full strength without thread strip; hardness range is controlled to prevent stress-corrosion susceptibility (HV 250–353 typical for high-grade nuts). Each lot is EN 10204 3.1 / 3.2 certified.
Special Patterns
TorqBolt also produces Alloy W Coupling nuts in weld-nut, T-nut, square-nut, knurled thumb-nut, and rivet-nut patterns. NACE MR0175 / ISO 15156 sour-service certification available; NORSOK M-650 qualified mills supplying high-temperature service grades.
High-nickel superalloys beyond the Inconel + Hastelloy family include specialty grades engineered for unique service envelopes — ultra-high-temperature furnace components, oxidation-resistant structural alloys, and corrosion alloys where C-276 reaches its limits.
Alloy 230 (UNS N06230) is a Ni-Cr-W-Mo solid-solution alloy combining the high-temperature strength of Inconel 625 with superior oxidation resistance to 1150°C — the standard for gas-turbine combustor cans and reformer tubes. Alloy 330 (N08330) is a Fe-Ni-Cr alloy for cyclic-temperature furnace fixtures. Alloy 333 (N06333) extends the envelope with higher Mo+W. Alloy 602 CA (N06025) achieves the highest oxidation resistance of any wrought Ni-base alloy at 1200°C+ via Al + reactive-element additions. Alloy W (N10004) is a Ni-Mo-Fe-Cr alloy for sulfuric and reducing-acid service.
These specialty alloys ship per ASTM B435 / B574 / B575 with EN 10204 3.1 / 3.2 certification including chemistry, mechanicals at room + elevated test temperatures, hardness, and oxidation / corrosion testing per the application's requirement. Welding requires matched-composition filler with strict control of dilution.
