What material grade does A286 Stainless Steel Hex Nuts use?

A286 Stainless Steel Hex Nuts are manufactured per the applicable ASTM, ASME, DIN, or ISO specification for the material grade. TorqBolt provides material test certificates (MTC) per EN 10204 3.1 or 3.2 with every supply.

What sizes are available for A286 Stainless Steel Hex Nuts?

TorqBolt manufactures A286 Stainless Steel Hex Nuts in metric sizes M6 to M100 and imperial sizes 1/4" to 4" diameter, with custom lengths from 10mm to 3000mm. Non-standard sizes are available on request.

Are A286 Stainless Steel Hex Nuts NACE MR0175 / ISO 15156 certified?

Yes, A286 Stainless Steel Hex Nuts can be supplied with NACE MR0175 / ISO 15156-2/3 sour service certification when specified at order. Material certificates and test reports are provided.

What is the typical delivery time for A286 Stainless Steel Hex Nuts?

Standard stock items ship in 1-2 weeks. Custom manufactured A286 Stainless Steel Hex Nuts typically ship in 4-6 weeks depending on quantity, material availability, and certification requirements.

Do you provide third-party inspection for A286 Stainless Steel Hex Nuts?

Yes, third-party inspection by TUV, Lloyd's Register, BV, DNV, SGS, and Intertek is available upon request for A286 Stainless Steel Hex Nuts. Witness testing and stage inspections can be arranged.

A286 Stainless Steel Hex Nuts Supplier

Name: A286 Stainless Steel Hex Nuts
Brand: TorqBolt
SKU: TB-A286STAINLESSSTEELHEXNUTS
Availability: InStock

A286 Stainless Steel Hex Nuts Specification

The raw material of these fasteners is classified as High temperature Austenitic Stainless Steel. Being a PED certified Fasteners Manufacturer by TUV Rheinland,our fasteners are accompanied with EN 10204 3.1/3.2 certification. A286 Stainless Steel Hex Nuts are available in hot forged,cold forged and bar stock machined conditions depending upon the order quantity.

A286 Stainless Steel Equivalent Designation

UNS Designation	British STD	Werkstoff No.	European STD	Swedish STD	Japanese STD
S 66286	Hr 51, Hr 650	1.4944 , 1.4980	X6nicrtimov26-15	10269, 2399	Sus 660

A286 Stainless Steel Hex Nuts — Specifications & Dimensions

A286 Stainless Steel Hex nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures A286 Stainless Steel Hex 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, A286 Stainless Steel Hex 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

A286 Stainless Steel Hex 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 A286 Stainless Steel Hex 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.

A286 — Iron-Nickel-Chromium Superalloy

A-286 (UNS S66286, AISI 660) is an iron-nickel-chromium age-hardenable superalloy positioned between austenitic stainless steels and Inconel for high-temperature bolting at 700-1300°F (370-700°C). Approximately 26% Ni + 15% Cr + 1.25% Mo with Ti-Al precipitation hardening, A-286 retains tensile strength and oxidation resistance well beyond the limits of standard 316 SS while being substantially more economical than full nickel superalloys.

A-286 is the standard high-temperature stud and bolt material for steam turbines, gas-turbine combustor cases, exhaust systems, jet-engine shafts, and superheater bolting. The alloy responds to a two-step heat treatment: solution anneal at 980°C (water quench) followed by ageing at 720°C for ~16 hours, yielding tensile ~895 MPa and yield ~585 MPa with elongation >15%.

A-286 fasteners are supplied per ASTM A453 grade 660 (with class A/B/C/D heat-treat conditions) and AMS 5731 / 5732 / 5734 / 5737. EN 10204 3.1 / 3.2 certification covers chemistry, mechanicals at room temperature + elevated test temperatures, hardness (HRC 24-35), and stress-rupture testing. NACE MR0175 / ISO 15156 sour-service compliance is achievable in specific heat-treat conditions; A-286 is widely qualified for downhole + wellhead bolting.

A286 Stainless Steel Hex Nuts