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DIN EN 1666 Standard Dimensions for Prevailing torque type hexagon nuts with flange with non-metallic insert with metric fine thread

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Prevailing torque type hexagon nuts with flange (with non-metallic insert) with metric fine thread

This european norm specifies the characteristics of hexagon head prevailing torque type hexagon nuts with flange (with non-metallic insert) with metric fine thread and nominal diameter d from 8 mm to 20 mm, in product class A for sizes up to 16 mm and product class B for sizes over 16 mm and strenght classes 6, 8 and 10.

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in mm - source DIN 1666
Publication date: 02/1998 Supersedes DIN 6926: 01/1983
d: Thread size: fine m min h min÷max c min dc max s max e min
M 8x1 7.64 10.4÷11.1 1.2 17.9 13 14.38
M 10x1-1.25 9.64 12.8÷13.5 1.5 21.8 16 17.77
M 12x1.5-1.25 11.57 15.4÷16.1 1.8 26 18 20.03
M 14x1.5 13.3 16.9÷18.2 2.1 29.9 21 23.36
M 16x1.5 15.3 19÷20.3 2.4 34.5 24 26.75
M 20x1.5 18.7 22.7÷24.8 3 42.8 30 32.95

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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