Titanium Grade 12 Coupling Nuts manufactured at TorqBolt are of Excellent stiffness,toughness and high strength low density combination.
Dimensional standards as per DIN 439B,DIN 6334,ISO 898-2,DIN 3871,DIN 8434-73 are provided.
The raw material of these fasteners is classified as AeroSpace Titanium Alloys. Being a PED certified Fasteners Manufacturer by TUV Rheinland,our fasteners are accompanied with EN 10204 3.1/3.2 certification. Titanium Grade 12 Coupling Nuts are available in hot forged,cold forged and bar stock machined conditions depending upon the order quantity.
Titanium Grade 12 Coupling nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures Titanium Grade 12 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, Titanium Grade 12 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
Titanium Grade 12 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 Titanium Grade 12 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.
Titanium & Titanium Alloys
Titanium alloys deliver an exceptional strength-to-weight ratio (density ~4.5 g/cm³, half of steel) combined with outstanding seawater + chloride corrosion resistance — the spontaneously-formed TiO₂ surface film is impervious to chlorides and most oxidizing acids. Titanium is the default for marine offshore, desalination, chemical-process, and aerospace fasteners requiring weight reduction with corrosion immunity.
Grade 2 commercially-pure (CP-Ti) is the workhorse: yield ~275 MPa, fully formable, weldable, the standard for heat-exchanger tubing and chloride-service bolting. Grade 5 (Ti-6Al-4V) is the alpha-beta alloy delivering yield ~828 MPa after solution + age treatment per AMS 4928 / ASTM B348 — the dominant aerospace + medical grade. Grade 7 / Grade 11 add Pd for crevice + reducing-acid resistance. Grade 9 (Ti-3Al-2.5V) is the high-strength tubing alloy. Grade 12 (Ti-Mo-Ni) trades strength for hot-brine corrosion performance.
Titanium fasteners ship per ASTM B348 (Grade 2 / 5) and AMS 4928 / 4965 with EN 10204 3.1 / 3.2 certificates including hydrogen (≤ 125 ppm), oxygen, and tensile testing. Welding requires inert-gas shielding (back-purged Ar) to prevent embrittlement. NACE MR0175 sour-service is fully qualified across all common grades.
