DIN 9021 – Plain washers, large outer diameter

DIN 9021 specifies plain washers with a large outer diameter – about three times the thread diameter. The wide bearing face spreads the clamping load over a larger area, which protects thin sheet, soft materials and oversized or slotted holes.

The ISO counterpart is ISO 7093-1 (product grade A). Some dimensions were changed, and ISO 7093 only has hardness classes 200 HV and 300 HV. As an example, a DIN 9021 washer for M10 has an inner diameter of 10.5 mm, an outer diameter of 30 mm and a thickness of 2.5 mm.

We supply DIN 9021 washers from M2.5 to M36 in steel 200 HV and in stainless A2 and A4; stainless sizes up to M12 are also available EPK-treated. For bolts of property class 10.9 and higher, choose a 300 HV washer instead. Where the hole is standard and the load is high, a DIN 125-A washer with its smaller outer diameter is often the better choice.

Applications

• Sheet metal, panels and cladding
• Slotted or oversized holes
• Soft materials such as plastics, wood and aluminium
• Cleanroom and vacuum equipment in A2 or A4 with EPK treatment

Nederlands: sluitringen DIN 9021, carrosseriesluitringen, sluitringen met grote buitendiameter, RVS sluitringen.