2 - 1
Section 1 General Information
9803/8550
Section 1
2 - 1
Issue 2*
Torque Settings
Use only where no torque setting is specified in the text. Values are for dry threads and may be within three per cent of the
figures stated. For lubricated threads the values should be REDUCED by one third.
UNF Grade 'S' Bolts
Bolt Size Hexagon (A/F) Torque Settings
in (mm) in Nm kgf m lbf ft
1
/4 (6.3)
7
/16 14 1.4 10
5
/16 (7.9)
1
/2 28 2.8 20
3
/
8 (9.5)
9
/
16 49 5.0 36
7
/16 (11.1)
5
/8 78 8.0 58
1
/2 (12.7)
3
/4 117 12.0 87
9
/
16 (14.3)
13
/
16 170 17.3 125
5
/8 (15.9)
15
/16 238 24.3 175
3
/4 (19.0) 1
1
/8 407 41.5 300
7
/8 (22.2) 1
5
/16 650 66.3 480
1 (25.4) 1
1
/2 970 99.0 715
1
1
/4 (31.7) 1
7
/8 1940 198.0 1430
1
1
/2
(38.1) 2
1
/4
3390 345.0 2500
Metric Grade 8.8 Bolts
Bolt Size Hexagon (A/F) Torque Settings
in (mm) in Nm kgf m lbf ft
M5 (5) 8 7 0.7 5
M6 (6) 10 12 1.2 9
M8 (8) 13 28 3.0 21
M10 (10) 17 56 5.7 42
M12 (12) 19 98 10 72
M16 (16) 24 244 25 180
M20 (20) 30 476 48 352
M24 (24) 36 822 84 607
M30 (30) 46 1633 166 1205
M36 (36) 55 2854 291 2105
Note: All bolts used on JCB machines are high tensile and must not be replaced by bolts of a lesser tensile specification.
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