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ISO 14581 M8

Countersunk head screw,hexalobular (Torx) drive

  • Thread M8 × 1.25
  • Torx bit T45
  • Tap drill Ø 6.8 mm

Dimensions and tolerances (mm)

ISO 14581 countersunk screw side view with the socket drawn dashed, showing d, P, dk, k, l and the socket depth tISO 14581 countersunk screw side view with the socket drawn dashed, showing d, P, dk, k, l and the socket depth t
Side view
ISO 14581 countersunk screw seen from the head, with the Torx socket width AISO 14581 countersunk screw seen from the head, with the Torx socket width A
Head view
minnom.max
d
dk
k
T
A
t

Values per ISO 14581:2013. The values follow this edition; the current one is ISO 14581:2022.

In bold: the value shown in the table on the standard page.

Work out the screw length you needOpens the bolted joint configurator with ISO 14581 M8 chosen.

Standard threads (mm)

Pd₂d₃
M8Coarse (most common)1.257.1886.466
M8 × 1Fine1.007.3506.773

Profile per ISO 68-1 · tolerance class 6g

Standard lengths (mm)

Length l measured from the top of the head.

10121416202530354045505560

Screws up to 45 mm are fully threaded.Longer ones are threaded for b = 38 mm.

Verified data

We have checked this data against reliable sources.MechLab Geek accepts no liability for any use of this data or its consequences. Check it before you use it. Legal notice.Spotted a mistake? Let us know.

References

← All ISO 14581 sizes