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DIN 6900 1 Standard Dimensions for Screw and washer assemblies made of steel with plain washers. Washer hardness classes 200 HV and 300 HV

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Sems screws are often called: Captivated Washers, Screw Washer Assemblies or Combi Screws. They are a combination of a screw or bolt with a built in unloosable and free to rotate washer or set of washers. The technology has brought benefits to assembly lines the world over. Sems screws are being used to make product assembly more cost effective in many industries including automotive and micro electronics.

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in mm - source DIN 6900-1

Publication date: 12/1990 Supersedes DIN 6900-1: 12/1972

d Thread size

 a max Dimensions of plain washers (according to Din 6902)
Small series
Normal series
 Large series
h nom
d2 max
h nom
d2 max
h nom
d2 max
M 2.5
2 P
 0.6 5 0.6 6 0.8 8
M 3
2 P
 0.6 6 0.6 7 0.8 9
M3.5
2 P
 0.8 7 0.8 8 0.8 11
M 4
2 P
 0.8 8 0.8 9 1 12
M 5
2 P
 1 9 1 10 1.6 15
M 6
2 P
 1.6 11 1.6 12 1.6 18
M 8
2 P
 2 15 2 16 2 24
M 10
2 P
 2.5 18 2.5 20 2.5 30
M 12
2 P
 3 20 3 24 3 37

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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