DD Lock Washer with External and Internal Teeth
DD lock washer with external and internal teeth doubly protects a threaded joint from loosening. FLOK supplies sizes M4–M16, outer diameter 15–35 mm.
Shaped washer A.D.D.PRO
The letters DD mark a lock washer with two rows of teeth. One row of teeth is located along the inner perimeter of the central hole, the other – along the outer contour of the part. It is manufactured from spring steel alloys, zinc-plated or stainless. The DD lock washer with external and internal teeth is used in various fields, including timber construction and furniture manufacturing. It holds a bolted joint under vibration and dynamic loads.
The double-sided teeth of the DD lock washer provide double protection of the threaded fastener against self-loosening. The internal teeth engage with the bolt or stud, while the external teeth engage with the surface of the mating part. Corrosion resistance allows the washers to be used together with metric fasteners under demanding operating conditions.
FLOK supplies shaped washers with an inner diameter for thread sizes from M4 to M16 and an outer diameter from 15 mm to 35 mm.
| d | d1 | d2 |
|---|---|---|
| M4 | 4.3 | 15.0 |
| M5 | 5.3 | 18.0 |
| M6 | 6.3 | 18.9 |
| M8 | 8.3 | 27.0 |
| M10 | 10.3 | 25.4 |
| M12 | 12.3 | 30.0 |
| M16 | 16.5 | 35.0 |
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