Tightening torques for Nord Lock lock washers
Several Nord Lock bolt securing systems are used on the
SBE to generate safely lock bolted joints. Regarding the
fact that different sizes and metric grades are applied
detailed information from Nord Lock is given in the annex
(refer to „Third Party Documents“) to generate safe
maintenance by the user.
If the tightening torque needed to fasten a screw/nut is not
explicitly written in this manual, please check the screw/
nut head an refer to the annex in order to find the required
fastening torque:
The metric grade and make of the bolt can be seen on top
of the bolt/nut.
Fig. 31: Bolt head marking
On FORUM Handling Tools Pipe Handling Equipment
the metric grades 8.8, 10.9 and 12.9 are used and
the tightening torques can be found in „Third Party
Documents“.
WARNING Please pay extra attention to the method
of tightening as the tightening torques may vary on the
methods.
INFO
As a result from tests the NORD LOCK washers
were safely secured even after reuse 30 times.
Only a limited part of the clamp load was lost
due to normal settlements between contact
surfaces. The cam edges of the washers got
rounded off but were still intact after the
reuse test. The best thing to do is to make
ocular inspection of the washers during every
maintenance. Make sure that the cams (cam
tops) look good and that the teeth are not worn
off. Lubricate the joint and the mating surfaces
if possible so that the friction conditions do not
change. When reassembling, care should be
taken that the two washer halves are mated
correctly. If all these criteria are met, the washers
can be safely reused.
5.3
Drawing, Parts Break Down
and Spare Parts
INFO
Please contact the FORUM Handling Tools
Technical Support or one of the authorized
service companies (refer to „X Contact
worldwide“ on page 11) to order replacement
parts or in the event of any questions.
Operation Maintenance Manual
07-2018
PN 691250-Z-BC-D - Revision: 04
Solid Body Elevator
27
SE
RV
ICE
