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BS 4174 11 Standard Dimensions for Tapping screws, cross recessed countersunk flat head

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80° Recess truncated countersunk head screws, type Z

Dimensional Drawing and Technical Diagrams

1758_LsZGIw_bs-4174-11.jpg

Key Dimensions and Technical Parameters

Dimensions in mm - source BS 4174 Table 11 80° Recess truncated countersunk head screws, type Z:

Publication date: 10 - 1972
Ø thread size
dk min
 dk max
k min
 k max
t min
 t max m nom recess nr.
ST 2.2
 3.73 4.37 0.71 0.91 1.02 1.42 2.21 1
ST 2.9
 4.95 5.71 0.96 1.19 1.57 1.98 2.77 1
ST 3.5
 6.2 7.09 1.22 1.5 1.57 1.98 3.51 2
ST 4.2
 7.42 8.43 1.47 1.78 2.26 2.72 4.22 2
ST 4.8
 8.64 9.78 1.73 2.06 2.62 3.07 4.60 2
ST 5.5
 9.88 11.13 1.98 2.34 2.62 3.07 5.72 3
ST 6.3
 11.48 12.88 2.34 2.72 3 3.45 6.10 3
ST 8 14.43 16.13 2.95 3.4 3.91 4.37 7.85 4

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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