DIN 7991 / ISO 10642 Stainless Flat Head Countersunk Socket Cap Screw

Socket Cap Screws

A2 / A4 Stainless

*Flat Head Countersunk

S026 - 7991-A2
S028 - 7991-A4

DIN 7991
ISO 10642

DIN 7991 Technical Drawing
Diameter M2 M2.5 M3 M4 M5
b up to 125 12 14 16
b up to 200
t 1.2 1.8 2.3
e 2.3 2.87 3.44
s 2 2.5 3
k max. 1.7 2.3 2.8
d1 6 8 10
Length (mm) A2 A4 A2 A4 A2 A4 A2 A4 A2 A4
S026 S028 S026 S028 S026 S028 S026 S028 S026 S028
3 100
4 100
5 100 100
6 100 100 100 100 100 100
8 100 100 100 100 100 100 100
10 100 100 100 100 100 100
12 100 100 100 100 100 100
16 100 100 100 100 100 100
18 100
20 100 100 100 100 100 100
25 100 100 100 100 100 100
30 100 100 100 100 100
35 100 100 100 100
40 100 100 100 100
50 100

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Diameter M6 M8 M10 M12 M16
b up to 125 18 22 26 30 38
b up to 200 24 28 32 36 44
t 2.5 3.5 4.4 4.6 5.3
e 4.58 5.72 6.86 9.15 11.43
s 4 5 6 8 10
k max. 3.3 4.4 5.5 6.5 7.5
d1 12 16 20 24 30
Length (mm) A2 A4 A2 A4 A2 A4 A2 A4 A2 A4
S026 S028 S026 S028 S026 S028 S026 S028 S026 S028
8 100
10 100 100
12 100 100 100
14 100
16 100 100 100 100 100 100
18 100
20 100 100 100 100 100 100 100
25 100 100 100 100 100 100 100 100
30 100 100 100 100 100 100 100 100 50
35 100 100 100 100 100 100 100 100
40 100 100 100 100 100 100 100 50
45 100 100 100 100 100
50 100 100 100 100 100 100 100 100 50
60 100 100 100 100 100 50 50 50
80 50
90 50
100 100 50
Order Number -> 7991-A2 M10x20 = S026-010-0020

*90° Countersink For Diameter M2 to M20 / 60° Countersink for Diameter M22 and Over

NOTE
Limited Use:
Flat head countersunk socket cap screws DIN 7991 are not intended for high strength application. The purpose of having them produced with a strength of the property class 10.9 is to increase the wear resistance of the sockets.

Tightening Procedure:
Insert the key into the socket and apply the torque on the nut while holding the key. Should however, the torque be applied on the screw itself it should be reduced accordingly.

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