MASSEY FERGUSON 1843S Workshop Service Manual page 13

Bolt Size Grade 2
Nm Lbf ft
5/16-18 15 11
3/8-16 27 20
7/16-14 43 32
1/2-13 66 49
9/16-12 95 70
5/8-11 130 97
3/4-10 235 170
7/8-9 225 165
1-8 340 250
Standard Bolt Identification
Grade 2
No Marks
4283392M1
Grade 5 Grade 8
Nm Lbf ft Nm Lbf ft
24 17 33 25
42 31 59 44
67 49 95 70
105 76 145 105
150 110 210 155
205 150 285 210
360 265 510 375
585 430 820 605
875 645 1230 910
Grade 5 Grade 8
3 Marks 6 Marks
General Information
Bolt Size Class 5.8
Nm Lbf ft
M 5 x 0.8 4 3
M 6 x 1 7 5
M 8 x 1.25 17 12
M 10 x 1.5 33 24
M 12 x 1.75 58 42
M 14 x 2 92 68
M 16 x 2 145 105
M 18 x 2.5 195 145
M 20 x 2.5 280 205
M 24 x 3 480 355
Identify metric bolts by the class number stamped on the bolt
head or nut. Higher numbers indicate higher strength.
Class 8.8 Class 10.9
Nm Lbf ft Nm Lbf ft
6 5 9 7
11 8 15 11
26 19 36 27
52 39 72 53
91 67 125 93
145 105 200 150
225 165 315 230
310 230 405 300
440 325 610 450
760 560 1050 780
01-9