Home / Bolts and Machine Screws - Metric / M20 x 40mm Socket Head Csk (Allen) Screw in A2 Stainless - ISO 10642

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M20 x 40mm Socket Head Csk (Allen) Screw in A2 Stainless - ISO 10642

A countersunk headed screw conforming with ISO 10642 or DIN 7991, requiring a hex key (otherwise known as an Allen key) to fit. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Generally manufactured with a full thread, though occasionally some stock may include a partially threaded shank. The head diameter is slightly larger than that of the equivalent DIN 965 Phillips or Pozi driven screw.

Socket Head Countersunk Screws ISO 10642 (DIN 7991) in A2 image

technical drawing of Socket Head Countersunk Screws ISO 10642 (DIN 7991)

Technical Summary

nominal diameter

M20

thread pitch

2.50

dk max.

maximum head diameter

36.75

dk min.

minimum head diameter

35.40

k max.

maximum head height

10.160

k min.

minimum head height

9.037

s max.

maximum drive size

12.212

s min.

drive min.

12.032

minimum thread length

t max.

maximum recess depth

6.40

t min.

minimum recess depth

5.60

width across corners

13.716

Standard

ISO 10642

all dimensions in millimetres (mm)

				ISO 10642 Standard HTML
				ISO 10642 Standard PDF

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Description	Sale Qtys	Qty	Price	Breakdown	Despatch Estimate
M20 x 40mm Socket Head Csk (Allen) Screw in A2 Stainless WF76427			£6.92

M20 x 40mm Socket Head Csk (Allen) Screw in A2 Stainless WF76427

£6.92

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