S0309000
Page 4
Standard Torques
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TORQUE VALUES FOR STANDARD U.S. FASTENERS
Recommended torque, in foot pounds, for all Standard Application Nuts and Bolts, provided:
1. All thread surfaces are clean and lubricated with SAE-30 engine oil. (See Note.)
2. Joints are rigid, that is, no gaskets or compressible materials are used.
3. When reusing nuts or bolts, use minimum torque values.
NOTE:
Multiply the standard torque by:
0.65 when finished jam nuts are used.
0.70 when Molykote, white lead or similar mixtures 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.
0.90 when hardened surfaces are used under the nut or bolt head.
NOTE:
When reusing bolts and nuts in service, use minimum torque values.
TYPE
S.A.E.
GRADE
DESCRIPTION
BOLT HEAD
MARKING
1 1 OR 2
WILL HAVE NO MARKINGS IN THE CENTER OF THE
HEAD.
Low or Medium Carbon Steel Not Heat Treated.
55
WILL HAVE THREE RADIAL LINES.
Quenched and Tempered Medium Carbon Steel.
88
WILL HAVE 6 RADIAL LINES.
Quenched and Tempered Special Carbon or Alloy Steel.
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