DIN 7989 Enlarged/Reinforced Flat Washer
FLOK supplies enlarged (reinforced) flat washers DIN 7989 made from alloy steel and stainless steel A2, A4, brass with zinc coating for structural assembly.
The washer, manufactured in accordance with DIN 7989 requirements, is made in the form of a disc with a hole in the center. It has flat surfaces on both sides and an increased thickness, which is why it is called enlarged or reinforced. It is used together with rod-type threaded fasteners: bolts, screws, studs, self-tapping screws.
Including a DIN 7989 washer in a fastener joint gives the assembled unit additional strength.
The thick backing protects the joined surfaces from damage, and protects the fastener from spontaneous unscrewing under operating loads. The enlarged-thickness washer is also used to adjust the length of the threaded engagement.
The product is manufactured from alloy steel with subsequent galvanic zinc coating. Stainless steel grades A2 and A4, and brass are also used as source materials. The fasteners are used in the assembly of machines, machine tools, instruments, and structures in mechanical engineering and construction.
Dimension table for enlarged (reinforced) flat washer DIN 7989
| d | d₁ | d₂ |
|---|---|---|
| M10 | 13.0 | 30 |
| M12 | 15.0 | 33 |
| M16 | 17.0 | 36 |
| M20 | 21.0 | 42 |
| M22 | 23.0 | 50 |
| M24 | 25.0 | 50 |
| M27 | 28.0 | 58 |
| M30 | 31.0 | 63 |
| M33 | 34.0 | 68 |
| M36 | 37.0 | 75 |
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