Flexxaire Fan Caterpillar

Torque Specifications (Flexxaire Fan)

Usage:

General Information on Torques

Exceptions to these torques are given in the Service Manual, if necessary.

Prior to installation of any hardware, ensure that components are in near new condition. Bolts and threads must not be worn or damaged. Threads must not have burrs or nicks. Hardware must be free of rust and corrosion. Clean the hardware with a noncorrosive cleaner. Do not lubricate the fastener threads except for the rust preventive. The rust preventive should be applied by the supplier of that component for purposes of shipping and storage. Other applications for lubricating components may also be specified in the Service Manual.

When you are tightening a fastener, a certified torque wrench must be used at all times. Two torque values exist in the tables that follow. The “Dry” values are for fasteners without adhesive. The “Wet” values are for fasteners with adhesive.

Torques for Metric Fasteners

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Table 1
Metric Nuts and Bolts
Thread Size Metric	Torque
	Grade 10.9		Grade 8.8
	Dry	Wet	Dry	Wet
M6	14 N·m (10 lb ft)	10 N·m (7.5 lb ft)	-	-
M8	34 N·m (25 lb ft)	26 N·m (19 lb ft)	23 N·m (17 lb ft)	18 N·m (13 lb ft)
M10	61 N·m (45 lb ft)	46 N·m (34 lb ft)	42 N·m (31 lb ft)	32 N·m (24 lb ft)
M12	108 N·m (80 lb ft)	81 N·m (60 lb ft)	76 N·m (56 lb ft)	57 N·m (42 lb ft)
M14	169 N·m (125 lb ft)	127 N·m (94 lb ft)	118 N·m (87 lb ft)	88 N·m (65 lb ft)
M16	285 N·m (210 lb ft)	217 N·m (160 lb ft)	196 N·m (145 lb ft)	149 N·m (110 lb ft)
M20	542 N·m (400 lb ft)	407 N·m (300 lb ft)	-	-
M24	1003 N·m (740 lb ft)	752 N·m (555 lb ft)	-	-
M30	2169 N·m (1600 lb ft)	-	-	-
M36	3660 N·m (2700 lb ft)	-	-	-

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Table 2
Metric Studs
Thread Size Metric	Torque
Thread Size Metric	Dry	Wet
M6	8 N·m (6 lb ft)	-
M8	18 N·m (13 lb ft)	-
M10	35 N·m (26 lb ft)	-
M12	65 N·m (48 lb ft)	-
M16	108 N·m (80 lb ft)	-
M20	169 N·m (125 lb ft)	-
M24	406 N·m (300 lb ft)	-
M30	746 N·m (550 lb ft)	-
M36	1193 N·m (880 lb ft)	-

Torques for Standard Fasteners

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Table 3
Inch Nuts and Bolts (UNF)
Thread Size Inch	Torque
	Grade 8
	Dry	Wet
#8	2.2 N·m (1.6 lb ft)	1.6 N·m (1.2 lb ft)
#10	4.6 N·m (3.4 lb ft)	3.5 N·m (2.6 lb ft)
1/4	19 N·m (14 lb ft)	14 N·m (10 lb ft)
5/16	38 N·m (28 lb ft)	28 N·m (21 lb ft)
3/8	61 N·m (45 lb ft)	46 N·m (34 lb ft)
7/16	99 N·m (73 lb ft)	73 N·m (54 lb ft)
1/2	136 N·m (100 lb ft)	103 N·m (76 lb ft)
9/16	192 N·m (142 lb ft)	144 N·m (106 lb ft)
5/8	305 N·m (225 lb ft)	230 N·m (170 lb ft)
3/4	563 N·m (415 lb ft)	420 N·m (310 lb ft)
7/8	861 N·m (635 lb ft)	644 N·m (475 lb ft)
1	1261 N·m (930 lb ft)	949 N·m (700 lb ft)

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Table 4
Inch Nuts and Bolts (UNC)
Thread Size Inch	Torque
	Grade 8
	Dry	Wet
#8	2.0 N·m (1.5 lb ft)	1.5 N·m (1.1 lb ft)
#10	4 N·m (3 lb ft)	3.1 N·m (2.3 lb ft)
1/4	16 N·m (12 lb ft)	12 N·m (9 lb ft)
5/16	34 N·m (25 lb ft)	26 N·m (19 lb ft)
3/8	54 N·m (40 lb ft)	41 N·m (30 lb ft)
7/16	88 N·m (65 lb ft)	68 N·m (50 lb ft)
1/2	129 N·m (95 lb ft)	98 N·m (72 lb ft)
9/16	172 N·m (127 lb ft)	129 N·m (95 lb ft)
5/8	271 N·m (200 lb ft)	203 N·m (150 lb ft)
3/4	502 N·m (370 lb ft)	373 N·m (275 lb ft)
7/8	780 N·m (575 lb ft)	583 N·m (430 lb ft)
1	1152 N·m (850 lb ft)	868 N·m (640 lb ft)

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Table 5
NPT and NPTF Threaded Joints
Size inch	Threads per Inch	Torque⁽¹⁾
Size inch	Threads per Inch	Dry⁽²⁾	Wet
1-16	27	11 N·m (8 lb ft)	11 N·m (8 lb ft)
1/8	27	16 N·m (12 lb ft)	16 N·m (12 lb ft)
1/4	18	20 N·m (15 lb ft)	24 N·m (18 lb ft)
3/8	18	35 N·m (26 lb ft)	45 N·m (33 lb ft)
1/2	14	45 N·m (33 lb ft)	60 N·m (44 lb ft)
3/4	14	60 N·m (44 lb ft)	74 N·m (55 lb ft)
1	11.5	74 N·m (55 lb ft)	89 N·m (66 lb ft)

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⁽¹⁾	Use 50% of the recommended torque when either portion of the threaded connector is nonferrous.
⁽²⁾	Adhesive refers to either the thread lock compound or the thread sealant.