S.N Malhotra Industries

DIN 7991 - Hexagon socket countersunk head cap screws

Current norm: DIN EN ISO 10462
Equivalent norms: ISO 10642; UNI 5933;

Legend:

b – length of the thread (at least)
l – length of bolt
d – the nominal diameter of the thread
k – head height
e – the diameter of the circumscribed circle (not less than)
ds – diameter of the screw shank
t – groove depth
dk – head diameter
s – size of the internal hexagon

Makings:

Steel: 8.8, 10.9, 12.9
Stainless: A2, A4
Plastic: –
Non Ferrous: –
Thread: 6g

Notes:

Table according to DIN 7991:

dimensions in mm
Thread dM3M4M5M6M8M10M12(M14)M16(M18)M20(M22)M24
P0,50,70,811,251,51,75222,52,52,53
a
0
90°60°
bl?125mm12141618222630343842465054
125<l?200mm24283236404448525660
l>200mm4549535761656973
capprox.0,20,30,30,30,40,50,50,50,50,50,511
dknominal=max.681012162024273033363639
 min.5,77,649,6411,5715,5719,4823,4826,4829,4832,3835,3835,3838,38
damax.3,64,75,76,89,211,213,715,717,720,222,424,426,4
dsnominal=max.345681012141618202224
min.2,863,824,825,827,789,7811,7313,7315,7317,7319,6721,6723,67
emin.2,32,873,444,585,726,869,1511,4311,4313,7213,721616
kmax.1,72,32,83,34,45,56,577,588,513,114
rmin.0,10,20,20,30,50,51111111,6
snominal22,534568101012121414
min.2,022,523,024,025,026,028,02510,02510,02512,03212,03214,03214,032
max.2,12,63,14,125,146,148,17510,17510,17512,21212,21214,21214,212
tnominal=max.1,21,82,32,53,54,44,64,85,35,55,98,810,3
min.0,951,52,052,253,24,14,34,555,25,68,449,87


Thread dM3M4M5M6M8M10M12
llengths ls and lg
nominalmin.max.ls min.lg max.ls min.lg max.ls min.lg max.ls min.lg max.ls min.lg max.ls min.lg max.ls min.lg max.
87,718,293,24,45,26,3      
109,7110,293,24,45,26,38,2    
1211,6512,353,24,45,26,38,210  
1615,6516,353,24,45,26,38,210  
2019,5820,423,24,45,26,38,21011,8
2524,5825,4210,5134,45,26,38,21011,8
3029,5830,4215,51812,5165,26,38,21011,8
3534,535,5  17,52115196,38,21011,8
4039,540,5  22,526202417228,21011,8
5049,550,5    3034273221,72816,52411,8
6059,460,6        31,73826,53421,2530
7069,470,6          36,54431,2540


Thread d(M14)M16(M18)M20(M22)M24
llengths ls and lg
nominalmin.max.ls min.lg max.ls min.lg max.ls min.lg max.ls min.lg max.ls min.lg max.ls min.lg max.
2019,5820,42            
2524,5825,4213          
3029,5830,421313,5        
3534,535,51313,515,516    
4039,540,51313,515,51620,6  
5049,550,51313,515,51620,623
6059,460,6162613,515,51620,623
7069,470,62636223215,5281620,623
8079,480,63646324225,53821,53420,623
9089,390,7  425235,54831,54427,54023
10099,3100,7    45,55841,55437,5503146
7069,470,6          36,544