Hardened flat steel clamping washers are used in high strength structural applications under bolt heads or nuts to increase the bearing surface area and to offer hardness so that the nut or bolt can be rotated without distortion of the bearing surface. Hardened Flat washers are used to give tightness to a joint and to distribute pressure under the head of a nut or bolt.
Material
Steel; grade at the manufacturer’s discretion.
Finish
Quenched and tempered; hardness (350 + 80) HV 30.
Designation
The washers are designated with a suffix defining the diameter of the washer.
Example: A washer with d1 = 17 mm will be designated as “Washer DIN 6340-17 “.
Also consider “Round washers for high-strength structural steel bolting – DIN 6916” as an alternative hardened washer.
Washers for Clamping Devices - DIN 6340
| d1 (H14) | 6.4 | 8.4 | 10.5 | 13 | 17 | 21 | 25 | 31 |
| d2 (h14) | 17 | 23 | 28 | 35 | 45 | 50 | 60 | 68 |
| s | 3 | 4 | 4 | 5 | 6 | 6 | 8 | 10 |
| For use with bolts of size | M6 | M8 | M10 | M12 | M16 | M20 | M24 | M30 |
Reference: DIN 6340 : 1987
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