3406E & 3056 INDUSTRIAL ENGINE – Metric (ISO) Fasteners

Metric (ISO) Nuts and Bolts




Illustration 1	g00909614

Note: The following table has the recommended standard torque values for metric nuts and bolts for use on all Caterpillar 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 Caterpillar standard torque values and Perkins standard torque values are due to different classes of fasteners. Caterpillar uses class 10.9 fasteners. Perkins uses class 8.8 fasteners. The different class of fasteners have different tensile strengths.

Metric (ISO) Taperlock Studs

Note: The following table has the recommended standard torque values for metric taperlock studs for use on all Caterpillar equipment and Mitsubishi engines.

Table 3
Thread Size mm	Torque
M6	8 ± 3 N·m (71 ± 27 lb in)
M8	17 ± 5 N·m (150 ± 44 lb in)
M10	35 ± 5 N·m (26 ± 4 lb ft)
M12	65 ± 10 N·m (48 ± 7 lb ft)
M16	110 ± 20 N·m (80 ± 15 lb ft)
M20	170 ± 30 N·m (125 ± 22 lb ft)
M24	400 ± 60 N·m (300 ± 44 lb ft)
M30	750 ± 80 N·m (550 ± 60 lb ft)
M36	1200 ± 150 N·m (880 ± 110 lb ft)

Note: The following table has the recommended standard torque values for Metric taperlock studs for use on Perkins engines.

Table 4
Thread Size mm	Torque
M6	5 N·m (44 lb in)
M8	11 N·m (97 lb in)
M10	18 N·m (160 lb in)
M12	25 N·m (220 lb in)

Metric (ISO) Machine Screws




Illustration 2	g00908932

Table 5
Thread Size mm	Torque
M1.6	0.10 ± 0.01 N·m (0.9 ± 0.1 lb in)
M2	0.15 ± 0.01 N·m (1.3 ± 0.1 lb in)
M2.5	0.35 ± 0.05 N·m (3.1 ± 0.4 lb in)
M3	0.50 ± 0.05 N·m (4.4 ± 0.4 lb in)
M4	1.70 ± 0.25 N·m (15.0 ± 2.2 lb in)
M5	2.25 ± 0.25 N·m (19.9 ± 2.2 lb in)

Hex Button Head Screw and Set Screws




Illustration 3	g01186742

Table 6
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)