Operation and Maintenance Manual Appendix
Standard tightening torques
Screws marking
Information
Except components listed below, and otherwise noted,
u Marking on screws or nuts to track their reuse is not required.
Fig. 100: Examples of markings on screws and HP pipe nut.
Some nuts and screws are marked to track their reuse. For:
– Fuel and HP injections pipes,
– Cutting rings,
If 2 punchs appears,
u Replace pipe or system after each untightening.
If none or 1 punch appears,
u Add one punch after each untightening.
8.4.2 Standard torques for hexagonal / cylinder / external hexalobular
heads
For hexagonal screws in accordance with:
– ISO 4014
– ISO 4017
– ISO 8765
– ISO 8676
For cylinder head screws in accordance with ISO 4762.
For screws with external hexalobular heads in accordance with DIN 34800.
Values for a mean friction factor of μ = 0.12 (without lub.)
Threads Nm ft/lb Nm ft/lb Nm ft/lb
8.8 10.9 12.9
M4 3 2.21 4 2.95 5 3.69
M5 6 4.43 8 5.9 10 7.38
M6 10 7.38 14 10.33 17 12.54
M7 16 11.8 23 16.96 27 19.91
M8 23 16.96 34 25.08 40 29.5
M10 46 33.93 68 50.15 79 58.27
KD83V16 33521030601_0_1 EN_US
2018-07
© 2018 by Kohler Co. All rights reserved.
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