Alloy 333 Nuts manufactured at TorqBolt are corrosion resistant,high temperature resistant with ultimate tensile strength.
Dimensional standards as per ANSI B18.2.2 in imperial and ANSI B18.2.4.6M in metric 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 333 Nuts are available in hot forged,cold forged and bar stock machined conditions depending upon the order quantity.
Alloy 333 Is A High Chromium Nickel Based Alloy Used At High Temperatures. This Alloy Is Very Tough And It Can Withstand Thermal Shock Of Both Oil And Water Quenching Media.
Alloy 333 nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures Alloy 333 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 333 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 333 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 333 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.
