A2 & A4 Stainless Form A Washer
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Stainless Steel Form A washers, available in both A4 stainless and A2. Form A washers are generally used for clamping and protective applications. A2 stainless, also known as 304 stainless, is suitable for general use but also favoured for areas requiring stronger corrosion resistance as it will not rust as long as it's not in contact with salt.
A4 Stainless, also known as 316 stainless, still suitable for general use but mostly used for coastal environments as this grade of stainless can be used in extremely corrosive environments.
| BOLT SIZE | INTERNAL DIAMETER (MM) | EXTERNAL DIAMETER (MM) | THICKNESS |
|---|---|---|---|
| M3 | 3.2 | 7 | 0.5 |
| M4 | 4.3 | 9 | 0.8 |
| M5 | 5.3 | 10 | 1 |
| M6 | 6.4 | 12.5 | 1.6 |
| M8 | 8.4 | 17 | 1.6 |
| M10 | 10.5 | 21 | 2 |
| M12 | 13 | 24 | 2.5 |
| M14 | 15 | 28 | 2.5 |
| M16 | 17 | 30 | 3 |
| M18 | 19 | 34 | 3 |
| M20 | 21 | 37 | 3 |
| M22 | 23 | 39 | 3 |
| M24 | 25 | 44 | 4 |
| M27 | 28 | 50 | 4 |
| M30 | 31 | 56 | 4 |
| M33 | 34 | 60 | 5 |
| M36 | 37 | 66 | 5 |
| M39 | 40 | 72 | 6 |
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