Hobson Technical Hex Bolts Size Chart
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1Hex Bolts
Tensile / Yield / Shear Strength
Tightening Torque
HEX BOLTS - RECOMMENDED TIGHTENING TORQUE
CLASS 8.8
Tensile
Proof
Shear
Size
Pitch
Stress Area Core Area
Recommended Tightening Torque
Strength
Strength
Strength
(mm)
(mm²)
(mm²)
(kN)
(kN)
(kN)
Plain (Nm) Zinc (Nm) HDG (Nm)
M6
1.00
20.1
17.9
16.1
11.7
8.6
9.1
6.4
19.1
M8
1.25
36.6
32.8
29.3
21.2
15.7
22.1
15.5
46.4
M10
1.50
58.0
52.3
46.4
33.6
25.1
43.7
30.6
91.8
M12
1.75
84.3
76.2
67.4
48.9
36.6
76.3
53.4
160.2
M14
2.00
115.0
104.7
92.0
66.7
50.3
121.4
85.0
254.9
M16
2.00
157.0
144.0
125.6
91.1
69.1
189.4
132.6
397.8
M18
2.50
192.0
175.0
159.4
115.2
84.0
269.6
188.7
566.1
M20
2.50
245.0
225.0
203.3
147.0
108.0
382.0
268.0
803.0
M22
2.50
303.0
281.0
251.5
181.8
134.9
520.0
364.0
1092.0
M24
3.00
353.0
324.0
293.0
211.8
155.5
661.0
463.0
1388.0
967.0
677.0
2030.0
M27
3.00
459.0
427.0
381.0
275.4
205.0
M30
3.50
561.0
519.0
465.6
336.6
249.1
1313.0
919.0
2757.0
M33
3.50
694.0
647.0
576.0
416.4
310.6
1786.0
1250.0
3751.0
2294.0
1606.0
4818.0
M36
4.00
817.0
759.0
678.1
490.2
364.3
M39
4.00
976.0
912.0
810.1
585.6
437.8
2969.0
2078.0
6235.0
M42
4.50
1120.0
1050.0
929.6
672.0
504.0
3670.0
2568.0
7705.0
M48
5.00
1470.0
1380.0
1220.1
882.0
662.4
5504.0
3853.0
11558.0
M56
5.50
2030.0
1910.0
1684.9
1218.0
916.8
8867.0
6207.0
18621.0
13379.0
9365.0
28095.0
M64
6.00
2680.0
2520.0
2224.4
1608.0
1209.6
Note:
The tightening torque values given in the above table serve only as a guide. A k factor of 0.2 has been used which assumes
threads are plain finish, burr free with a light oil coating. It should be noted that these figures are based on the first tightening of
single assemblies in isolation.
Please refer to AS4100 for correct tightening methods of AS1252, as the above figures do not apply.
v.1.5
August 2007
Quality Fasteners Since 1935
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