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Socket Head / Allen Bolts

Socket Head/Allen Bolt is a bolt with a hexagonal socket in its head that is designed to be used with an Allen wrench. The Allen bolt is integral to the crank and remains in it when the crank is removed from the spindle.
The primary advantage of Allen bolts is that they are perfect if you have a bolt that’s down inside a narrow opening. You can stick the Allen key down into the hole and do up the bolt.
A socket cap screws are machine screws with a cylindrical barrel-shaped head containing a hexagonal socket. The head has a smaller diameter than most other machine screw heads, typically just 1.5 times the nominal thread diameter. Socket cap screws may also be referred to as a socket head cap screw, a cap head socket screw, or a hex socket head screw.
Socket Head/Allen Bolt is often used with the head recessed within a counterbored hole, leaving the end of the head flush with the surface of the part being fastened. This produces a clean appearance and leaves no protrusions that could catch or be damaged, making them popular in sporting equipment such as bicycles.




SOCKET HEAD CAP SCREWS | ALLEN BOLTS - DIN 912



d1 M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M14 M16
d2 3.8 4.5 5.5 7 8.5 10 13 16 18 21 24
b 16 17 18 20 22 24 28 32 36 40 44
k 2 2.5 3 4 5 6 8 10 12 14 16
s 1.5 2 2.5 3 4 5 6 8 10 12 14
t min 1 1.1 1.3 2 2.5 3 4 5 6 7 8


d1 M18 M20 M22 M24 M27 M30 M33 M36 M42 M48
d2 27 30 33 36 40 45 50 54 63 72
b 48 52 56 60 66 72 78 84 69 108
k 18 20 22 24 27 30 33 36 42 48
s 14 17 17 19 19 22 24 27 32 36
t min 9 10 11 12 13.5 15.5 18 19 24 28



Metric Series Approx Weight Per 1000 Pc.
Dia M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M14 M16
Length
3mm   0.16                  
4mm 0.18 0.35                  
5mm 0.20 0.38 0.67 1.42              
6mm 0.22 0.41 0.71 1.50 2.20 3.96          
8mm 0.26 0.47 0.80 1.70 2.45 4.33          
10mm 0.30 0.53 0.88 1.80 2.70 4.70 10.3        
12mm 0.36 0.59 0.96 1.95 2.95 5.07 10.9 10.9      
14mm 0.39 0.65 1.06 2.10 3.20 5.44 11.5        
16mm 0.42 0.71 1.16 2.25 3.45 5.75 12.1 20.9      
18mm 0.46 0.77 1.24 2.46 3.73 6.14 12.8 21.9      
20mm 0.50 0.83 1.36 2.65 4.01 6.53 13.4 22.9 32.1    
22mm   0.90 1.48 2.80 4.39 6.90 14.2 23.9 33.9    
25mm   0.98 1.61 3.15 4.78 7.59 15 25.4 35.7 48 71.3
30mm     1.86 3.65 5.55 8.30 16.9 27.9 39.3 53 77.8
35mm     2.11 4.15 6.32 9.91 18.9 30.4 42.9 58 84.4
40mm     2.36 4.65 7.09 11.0 20.9 32.9 46.5 63 91.0
45mm     2.61 5.15 7.86 12.1 22.9 36.1 50.1 68 97.6
50mm     2.86 5.65 8.63 13.2 24.9 39.3 54.5 73 106
55mm     3.11 6.15 9.40 14.3 26.9 42.5 58.9 78 114
60mm     3.36 6.65 10.17 15.4 28.9 45.7 63.4 84 122
65mm     3.61 7.15 10.94 16.6 31.0 48.9 67.8 90 130
70mm     3.86 7.65 11.71 17.6 33.0 52.1 71.3 96 138
75mm           18.7 35.0 55.3 75.8 102 146
80mm       8.65 13.25 19.8 37.0 58.5 80.2 108 154
90mm       9.65   22.0 40.6 64.9 89.1 120 170
100mm       10.15   24.2 45 71.2 98 132 186
110mm           26.0 49 77.4 107 144 202
120mm           28.6 53 83.6 116 156 218
130mm           30.8 57 89.8 125 168 234
140mm           33.0 61 96.0 134 180 250
150mm           35.2 65 102.2 143 192 266
160mm             69 105.3 148 204 282
170mm             73 108.1 152 216 298
180mm             77 111.5 157 228 314
190mm             81 114.6 161 240 330
200mm             85 117.7 166 252 346
250mm                 188 312 426
270mm                 197 336 458
300mm                 211 372 506



Metric SeriesApprox Weight Per 1000 Pc.
DiaM18M20M22M24M27M30M33M36M42M48
Length
30mm111128        
35mm120139211       
40mm129150224270      
45mm138161237285 500    
50mm147172250300 527    
55mm156183263316 554 870  
60mm165194276330 581 910  
65mm174205291345 608 950  
70mm183216306363 635 990 2040
80mm203241336399 690 1070 2180
90mm223266366435 745 1150 2320
100mm243291396471 800 1230 2460
110mm263316426507 855 1310 2600
120mm283341456543 910 1390 2740
130mm303366486579 965 1470 2880
140mm323391516615 1020 1550 3020
150mm343416546651 1080 1630 3160
160mm363441576687 1130 1710 3300
170mm383466606723 1185 1790 3445
180mm403491636759 1240 1870 3590
190mm423516666795 1295 1950 3730
200mm443541696831 1350 2030 3870
250mm 6668461011 1625 2330 4570
270mm 7169061083 1735 2490 4850
300mm 7919961191 1900 2730 5270


SOCKET HEAD CAP SCREWS | ALLEN BOLTS - BS 2470


d1 1/8" 3/16" 1/4" 5/16" 3/8" 7/16" 1/2" 5/8" 3/4" 7/8" 1"
d2 5.5 7.6 9.5 11.1 14.2 15.8 19.0 22.2 25.4 28.5 33
b 19 22 25 28 32 35 38 45 50 60 65
k 3.1 4.7 6.3 7.9 9.5 11.0 12.7 15.9 19.0 22.0 25.0
s 3/32" 5/32" 3/16" 7/32" 5/16" 5/16" 3/8" 1/2" 9/16" 9/16" 5/8"


Inch Series - BSW | UNC Approx Weight Per 1000 Pc.
Dia 1/8" 3/16" 1/4" 5/16" 3/8" 7/16" 1/2" 5/8" 3/4" 7/8" 1"
Length
1/4" 1.82 2.82                  
3/8" 2.09 3.00 5.45                
1/2" 2.36 3.36 6.82 10.46              
5/8" 2.69 3.68 7.73 11.36 18.18            
3/4" 3.05 4.00 8.18 12.27 19.55   42.27        
1" 3.55 5.00 9.09 13.64 22.73 31.82 47.73 70.91      
1.1/4" 3.89 5.45 10.00 15.91 26.36 36.36 53.36 78.18 128.18    
1.1/2" 4.22 6.36 12.27 18.18 30.91 40.46 59.69 86.82 138.64    
1.3/4"   6.82 13.18 20.00 32.73 44.55 63.64 92.27 153.18    
2"   7.73 14.55 22.73 36.36 46.71 69.55 103.15 166.36 240.00 347.73
2.1/4"   8.32 15.90 24.55 39.55 48.86 76.36 110.00 176.82 256.36 370.45
2.1/2"   9.09 17.27 27.27 41.82 57.27 81.82 126.36 187.27 273.64 393.64
2.3/4"   10.00 18.18 29.55 43.64 58.00 87.73 127.73 195.46    
3"   10.64 19.09 31.36 47.73 65.91 92.27 135.00 217.27 310.00 434.07
3.1/4"     20.50 33.18 52.27 67.73 95.46 149.09 229.55    
3.1/2"     22.00 35.91 53.64 73.64 102.27 156.36 237.73 343.64 478.64
4"     25.00 41.82 60.46 81.82 113.64 177.73 274.55 378.18 531.82
4.1/2"       45.00 69.55   127.27 195.46 295.46 420.00 583.18
5"       49.77 77.27   140.91 216.36 329.55 454.55 606.82
5.1/2"       53.41 80.50   151.82 237.73 349.09 500.00 672.73
6"       57.14 89.00   164.55 252.27 380.91 527.27 725.00
6.1/2"         96.00   176.36 270.45 407.73 568.18 775.00
7"         101.00   188.18 288.18 434.55 609.09 823.64
7.1/2"             200.00 306.36 460.00    
8"         114.86   211.82 324.09 506.82 645.46 922.73
9"         128.68   235.46 360.00 579.09 709.09 1021.82
10"         142.00   259.09 395.91 632.73 768.18 1120.46
12"             307.27 507.82 740.00 881.82 1318.18