On this page 5 sections
Key features of flat washers
- ASTM F436 hardened washers
- ISO 7089 / 7091
- Carbon, stainless and alloy
- Plain or galvanised
Flat Washers by material
Flat Washers are available in the following grades. Select a grade for specifications and sizes.
Stainless Steel
- SS 304 Flat Washers
- SS 316 Flat Washers
- SS 316L Flat Washers
- SS 321 Flat Washers
- SS 347 Flat Washers
- SS 904L Flat Washers
- Duplex 2205 Flat Washers
- Super Duplex 2507 Flat Washers
Nickel Alloys
- Inconel 600 Flat Washers
- Inconel 625 Flat Washers
- Inconel 718 Flat Washers
- Incoloy 800 Flat Washers
- Incoloy 825 Flat Washers
- Monel 400 Flat Washers
- Monel K-500 Flat Washers
- Hastelloy C22 Flat Washers
- Hastelloy C276 Flat Washers
Non-Ferrous Metals
Flat Washers: sizes, finishes and testing
- Size range
- M6 – M100 and ¼" – 4" bolt sizes
- Finish
- Plain, zinc, galvanised
Testing & documents
- Hardness tests
- Dimensional checks
- EN 10204 3.1 certificate; 3.2 with third-party inspection
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Other washers types
Frequently asked questions
What sizes are flat washers available in?
M6 – M100 and ¼" – 4" bolt sizes.
Which specifications cover flat washers?
ASTM F436 hardened washers.
What are flat washers used for?
ISO 7089 / 7091. Through-hardened washers (ASTM F436) are used with high-strength structural and pressure bolting and for controlled tightening.
Which materials are flat washers available in?
Stainless steel, nickel alloys, carbon and alloy steel and non-ferrous metals, depending on the specification. See the material list above.