DIN 7991-10.9 Flat Head Countersunk Socket

Socket Cap Screws

10.9 Grade

*Flat Head Countersunk

S025 - 7991-10.9 Bare Steel
S029 - 7991-10.9 Zinc Plated

DIN 7991

DIN 7991 Technical Drawing
M2 - M8 M10 - M24
Diameter M2 M2.5 M3 M4 M5 M6 M8
b up to 125 --12 14 16 18 22
b up to 200 -----24 28
t 0.75 0.8 1.2 1.8 2.3 2.5 3.5
e --2.3 2.87 3.44 4.58 5.72
s 1.3 1.5 2 2.5 3 4 5
k max. 1.2 1.5 1.7 2.3 2.8 3.3 4.4
d1 4 5 6 8 10 12 16
Length (mm) Bare Zinc Bare Zinc Bare Zinc Bare Zinc Bare Zinc Bare Zinc Bare Zinc
S025 S029 S025 S029 S025 S029 S025 S029 S025 S029 S025 S029 S025 S029
Order Number -> 7991-10.9 Bare 3x20 = S025-003-0020 | 7991-10.9 Bare 8x100 = S025-008-0100

NOTE

Limited Use:
Flat head countersunk socket cap screws DIN 7991 are not intended for high strength application. The purpose of producing them 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.
5 100  100  100          
6 100  100  100  100        
8 100  100  100 100 100 100 100 100 100    
10 100  100  100 100 100 100 100 100 100 100 100  
12   100  100 100 100 100 100 100 100 100 100 100
14       100 100 100  100 100 100  
16   100  100 100 100 100 100 100 100 100 100 100
18           100    
20     100 100 100 100 100 100 100 100 100 100
22               
25     100 100 100 100 100 100 100 100 100 100
28               
30     100  100 100 100 100 100 100 100 100
35       100 100 100 100 100 100 100 100
40       100 100 100  100 100 100 100
45       100  100  100 100 100 100
50         100  100 100 100 100
55           100  100  
60           100  100 100
65           100    
70           100  100 100
80           100  100  
90             100  
100             100  

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Diameter M10 M12 M14 M16 M18 M20 M24
b up to 125 26 30 34 38 42 46 54
b up to 200 32 36 40 44 48 52 60
t 4.4 4.6 4.8 5.3 5.5 5.9 10.3
e 6.86 9.15 11.43 11.43 13.72 13.72 16
s 6 8 10 10 10 12 14
k max. 5.5 6.5 7 7.5 8 8.5 14
d1 20 24 27 30 33 36 39
Length (mm) Bare Zinc Bare Zinc Bare Zinc Bare Zinc Bare Zinc Bare Zinc Bare Zinc
S025 S029 S025 S029 S025 S029 S025 S029 S025 S029 S025 S029 S025 S029
Order Number -> 7991-10.9 Bare 10x20 = S025-010-0020 | 7991-10.9 Bare 24x100 = S025-024-0100

NOTE

Limited Use:
Flat head countersunk socket cap screws DIN 7991 are not intended for high strength application. The purpose of producing them 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.
16 100              
20 100 100 100 100           
25 100 100 100            
30 100 100 100 100 50  50        
35 100  100 100   50    25    
40 100 100 100 100 50  50    25    
45 100  100  50  50    25    
50 100 100 100  50  50  25  25    
55 100  50    50    25    
60 100  50  50  50  25  25    
70 100  50  50  25    25  10  
80 50  50  50  25  25  25  10  
90 50  50    25  25  25  10  
100 50  50    25  25  25  10  
110           25  10  
120       25    25  10  
140       25    25    

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