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DIN 440, flat washers for timber construction standard.
Type R, Flat washer with round hole;
Type V, Flat washer with square hole;
DIN 440 R Flat Washer dimension as below:
| Size | I.D | O.D | Thickness |
| M5 | 5.5 | 18 | 2.0 |
| M6 | 6.6 | 22.0 | 1.0 |
| M8 | 9.0 | 28.0 | 3.0 |
| M10 | 11.0 | 34 | 3.0 |
| M12 | 13.5 | 44.0 | 4.0 |
| M16 | 17.5 | 56 | 5.0 |
| M20 | 22 | 72 | 6.0 |
| M24 | 26 | 85 | 6.0 |
| M27 | 30 | 98 | 6.0 |
| M30 | 33 | 105 | 6.0 |
DIN 440 V - Flat washers with square hole dimension as below:
| Size | I.D | O.D | Thickness | Weight (kg/1000Pcs) |
| M5 | 5.5 | 18 | 2 | 3.52 |
| M6 | 6.6 | 22 | 2 | 5.28 |
| M8 | 9 | 28 | 3 | 12.6 |
| M10 | 11 | 34 | 3 | 18.5 |
| M12 | 13.5 | 44 | 4 | 41.6 |
| M16 | 17.5 | 56 | 5 | 84 |
| M20 | 22 | 72 | 6 | 169 |
| M22 | 24 | 80 | 6 | 210 |
Washers are vital components for assembly and fastening processes for successful operation; washers are the essential assembly component. Washers can be used under the head of the fastener, bolt, screw, or under the nut or a combination. Washers are designed to perform various functions in particular applications; these may be locking, load spreading, protection, decorative, tension indicating, sealing, or a combination of all these roles. Washers are also crucial for preventing galvanic corrosion, mainly by insulating steel screws from other material surfaces.
