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	M2	M2.5	M3	M4	M5	M6	M8	M10	M12	M14	M16
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 Series								Approx Weight Per 1000 Pc.
Dia	M18	M20	M22	M24	M27	M30	M33	M36	M42	M48
Length	M18	M20	M22	M24	M27	M30	M33	M36	M42	M48
30mm	111	128
35mm	120	139	211
40mm	129	150	224	270
45mm	138	161	237	285		500
50mm	147	172	250	300		527
55mm	156	183	263	316		554		870
60mm	165	194	276	330		581		910
65mm	174	205	291	345		608		950
70mm	183	216	306	363		635		990		2040
80mm	203	241	336	399		690		1070		2180
90mm	223	266	366	435		745		1150		2320
100mm	243	291	396	471		800		1230		2460
110mm	263	316	426	507		855		1310		2600
120mm	283	341	456	543		910		1390		2740
130mm	303	366	486	579		965		1470		2880
140mm	323	391	516	615		1020		1550		3020
150mm	343	416	546	651		1080		1630		3160
160mm	363	441	576	687		1130		1710		3300
170mm	383	466	606	723		1185		1790		3445
180mm	403	491	636	759		1240		1870		3590
190mm	423	516	666	795		1295		1950		3730
200mm	443	541	696	831		1350		2030		3870
250mm		666	846	1011		1625		2330		4570
270mm		716	906	1083		1735		2490		4850
300mm		791	996	1191		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	1/8"	3/16"	1/4"	5/16"	3/8"	7/16"	1/2"	5/8"	3/4"	7/8"	1"
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

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