Operation and Maintenance Manual Appendix
Standard tightening torques
8.4 Standard tightening torques
8.4.1 Screws pre-tightening, reuse and marking
NOTICE
Property damages by improper pre-tightening, turning angle or reuse of screws or nuts.
Improper pre-tightening, turning angle or reuse of screws or nuts could lead to the rupture of the
screw or nut and lead to property damages by malfunction, ejection, fall or tilting of components.
u Respect following pre-tightening, turning angle, reuse and marking specifications.
u In case of failure or damages, replace any threaded fastener immediately by the authorized
personnel.
Information
The values of the pre-tightening torque and the turning angle are specified in the maintenance
tasks.
Unless otherwise noted, use the standard torque values into the column of screws quality class
"8.8" to tighten screws and bolts.
The screws quality classes "10.9" and "12.9" are always indicated with the "Nm" symbol.
Pre-tightening torque and turning angle
Fig. 98: Pre-tightening marking and angles
u Tighten mounting bolt with the specified pre-tightening torque.
u Mark the specified turning angle on the screw head and on the component 1.
Information
One edge of hexagonal screw corresponds to 60°.
u On the socket key of the torque wrench 2, mark the initial position, aligned with the marking on
the component.
u Use the torque wrench to tighten until the marking of the initial position is aligned with the
marking on the component.
u Repeat process for the other screws, according to standard or described sequence.
KD83V16 33521030601_0_1 EN_US
2018-07
© 2018 by Kohler Co. All rights reserved.
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