What material grade does A286 Stainless Steel Flat Washers use?

A286 Stainless Steel Flat Washers 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 Flat Washers?

TorqBolt manufactures A286 Stainless Steel Flat Washers 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 Flat Washers NACE MR0175 / ISO 15156 certified?

Yes, A286 Stainless Steel Flat Washers 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 Flat Washers?

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

Do you provide third-party inspection for A286 Stainless Steel Flat Washers?

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

A286 Stainless Steel Flat Washers Supplier

Name: A286 Stainless Steel Flat Washers
Brand: TorqBolt
SKU: TB-A286STAINLESSSTEELFLATWASHERS
Availability: InStock

A286 Stainless Steel Flat Washers 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 Flat Washers 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 Flat Washers — Specifications & Dimensions

A286 Stainless Steel Flat washers distribute clamp load over a wider bearing area, prevent surface damage, and accommodate bolt-hole oversize. TorqBolt manufactures A286 Stainless Steel Flat washers per ASME B18.21.1 / B18.22.1, DIN 125 / 126 / 127 / 9021, and ISO 7089 / 7090 / 7093 / 7094, in metric (M3–M100) and imperial (#4–4") sizes.

Plain Washer Dimensions

A286 Stainless Steel Flat plain washers are characterized by three critical dimensions: ID (clearance over bolt diameter), OD (load distribution area), and thickness (compressive stiffness). Standard tolerances are h13 on OD and H13 on ID per ISO 286-2; flatness 0.05 mm/100 mm and parallelism 0.05 mm/100 mm verified per lot. Edge break / chamfer per drawing.

Form Variants

Form A (regular) — DIN 125-A / ISO 7089, the default plain washer

Form B (large OD) — DIN 9021 / ISO 7093, for soft mating surfaces

Form C (heavy) — DIN 7349 / ISO 7094, for slotted holes / structural use

Spring (split) — DIN 127 / ASME B18.21.1, helical anti-vibration

Tooth lock (internal / external) — DIN 6797 / 6798, anti-rotation

Conical / Belleville (DIN 6796 / 2093) — preload maintenance

Hardness & Surface

A286 Stainless Steel Flat washers are hardness-controlled to balance load-distribution stiffness against surface damage to mating parts. Typical Vickers HV ranges: plain 140–180 HV; spring 380–440 HV; Belleville 460–540 HV. Surface finish Ra 1.6 µm or better; on critical sealing applications, Ra 0.8 µm available.

Special Patterns

TorqBolt produces A286 Stainless Steel Flat washers in square (DIN 436), fender (oversized OD), tab / lock-tang (DIN 462 / 463), and spherical seat washer + cup combinations. EN 10204 3.1 / 3.2 material certificates standard; NACE MR0175 / ISO 15156 on request.

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 Flat Washers