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21. STANDARD TIGHTENING TORQUES
21.2.1 GRADE 5 AND 8 NON-PHOSPHATE
COATED HARDWARE
Recommended
torque for all Standard Application
Nuts and Bolts, provided; all thread surfaces are clean and
lubricated with SAE-30 engine oil or joints are rigid, that is, no gaskets or compressible
materials are used. When
reusing nuts or bolts, use minimum torque values.
THREAD
GRADE 5
N*m
Ibffi
I
I
1/4NC
8
6
9/16NC
1
114
I
84
3/4NC
1
278
I
205
3/4NF
312
240
7/8NC
414
305
7/8NF
1
454
I
334
I-1/8NF
1
929
I
685
I-1/4NC
1166
860
I-1/4NF
1295
955
I-1/2NF
2291
1690
I-3/4NC
3213
2370
2NC
I
4813
I
3550
Multiply the standard torque by 0.65 when finished jam nuts are used, 0.7 when Molykote, white lead or similar mixture
are used as lubricants, 0.75 when parkerized bolts or nuts are used, 0.85 when cadmium plated bolts or nuts and zinc
bolts w/waxed zinc nuts are used or 0.9 when hardened surfaces are used under the nut or bolt head. The General
Torque must be used in all cases where SPECIAL TORQUES are not given. Values listed in this manual are lubricated
(wet) threads; values should be increased l/3 for non-lubricated
(dry) threads.
3-l 6
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