3208 Marine Engine Metric (ISO) Fasteners Caterpillar


Metric (ISO) Fasteners
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1.1. Metric (ISO) Nuts and Bolts
2.1. Metric (ISO) Machine Screws
3.1. Hex Button Head Screw and Set Screws

Metric (ISO) Nuts and Bolts



Illustration 1g00909614

Note: The following table has the recommended standard torque values for metric nuts and bolts for use on all AVSpare equipment and Mitsubishi engines.

Table 1
Thread Size
mm 
Torque 
M6  12 ± 3 N·m (105 ± 27 lb in) 
M8  28 ± 7 N·m (250 ± 62 lb in) 
M10  55 ± 10 N·m (41 ± 7 lb ft) 
M12  100 ± 20 N·m (75 ± 15 lb ft) 
M14  160 ± 30 N·m (120 ± 22 lb ft) 
M16  240 ± 40 N·m (175 ± 30 lb ft) 
M20  460 ± 60 N·m (340 ± 44 lb ft) 
M24  800 ± 100 N·m (590 ± 75 lb ft) 
M30  1600 ± 200 N·m (1180 ± 150 lb ft) 
M36  2800 ± 350 N·m (2060 ± 260 lb ft) 

Note: The following table has the recommended standard torque values for metric nuts and bolts for use on Perkins engines.

Table 2
Thread Size
mm 
Torque 
M6  5 N·m (44 lb in) 
M8  22 N·m (195 lb in) 
M10  44 N·m (32 lb ft) 
M12  78 N·m (60 lb ft) 
M14  124 N·m (90 lb ft) 
M16  177 N·m (130 lb ft) 
M18  200 N·m (150 lb ft) 
M20  400 N·m (300 lb ft) 
M24  790 N·m (580 lb ft) 

Note: The difference between AVSpare standard torque values and Perkins standard torque values are due to different classes of fasteners. AVSpare uses class 10.9 fasteners. Perkins uses class 8.8 fasteners. The different class of fasteners have different tensile strengths.

Metric (ISO) Machine Screws



Illustration 2g00908932

Table 3
Thread Size
mm 
Torque 
M2.5  0.40 ± 0.10 N·m (3.5 ± 0.9 lb in) 
M3  0.70 ± 0.15 N·m (6.2 ± 1.3 lb in) 
M4  1.70 ± 0.40 N·m (15.1 ± 3.5 lb in) 
M5  3.30 ± 0.70 N·m (29.2 ± 6.2 lb in) 

Hex Button Head Screw and Set Screws



Illustration 3g01186742

Table 4
Thread Size
mm 
Torque 
M3  .6 ± .1 N·m (5 ± 0.9 lb in) 
M4  2 ± .3 N·m (18 ± 3 lb in) 
M5  4 ± .5 N·m (35 ± 4 lb in) 
M6  6 ± 1 N·m (55 ± 9 lb in) 
M8  15 ± 2 N·m (135 ± 18 lb in) 
M10  30 ± 7 N·m (265 ± 62 lb in) 
M12  50 ± 10 N·m (37 ± 7 lb ft) 
M14  80 ± 15 N·m (60 ± 11 lb ft) 
M16  125 ± 20 N·m (90 ± 15 lb ft) 
M20  250 ± 40 N·m (185 ± 30 lb ft) 
M24  425 ± 50 N·m (310 ± 37 lb ft) 
M30  850 ± 100 N·m (620 ± 75 lb ft) 
M36  1500 ± 200 N·m (1100 ± 150 lb ft)