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M2.5 x 20mm 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
d nominal diameter M2.5
thread pitch thread pitch 0.45
dk max. maximum head diameter 5.08
dk min. minimum head diameter 4.80
k max. maximum head height 1.690
k min. minimum head height 1.408
s max. maximum drive size 1.560
s min. drive min. 1.520
b minimum thread length -
t max. maximum recess depth 1.15
t min. minimum recess depth 1.00
e width across corners 1.733
Standard ISO 10642
all dimensions in millimetres (mm)
html graphic ISO 10642 Standard HTML
pdf graphic ISO 10642 Standard PDF
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Description Sale Qtys Qty Price Breakdown Despatch Estimate
M2.5 x 20mm Socket Head Csk (Allen) Screw in A2 Stainless
WF74650
£1.74
M2.5 x 20mm Socket Head Csk (Allen) Screw in A2 Stainless   WF74650
£1.74
Prices are subject to quantity discounts based on a sliding scale. Enter the desired quantity in the relevant box in the table above. This will automatically calculate a line price indicating the applicable rate for the quantities selected. All prices shown exclude VAT.
technical drawing of Socket Head Countersunk Screws ISO 10642 (DIN 7991)
Technical Summary
d nominal diameter M2.5
thread pitch thread pitch 0.45
dk max. maximum head diameter 5.08
dk min. minimum head diameter 4.80
k max. maximum head height 1.690
k min. minimum head height 1.408
s max. maximum drive size 1.560
s min. drive min. 1.520
b minimum thread length -
t max. maximum recess depth 1.15
t min. minimum recess depth 1.00
e width across corners 1.733
Standard ISO 10642
all dimensions in millimetres (mm)
html graphic ISO 10642 Standard HTML
pdf graphic ISO 10642 Standard PDF
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