USER'S AND
MAINTENANCE
MANUAL
Date:
01/31/2020
Code
MAN D185T4F-DB
ENG
Air Compressor : D185T4F-DB
Revision 03
Copyright © 2014, ROTAIR S.P.A. - All rights reserved
.
This manual is intellectual property of ROTAIR S.P.A.
Its full or partial reproduction is forbidden under any form, on any support and by any means, without the
written authorization by ROTAIR S.P.A.
Page
46/59
13.3 Torque values for screws and bolts
For the correct tightening of screws and bolts on the machine
,
please observe the t
orque
values
corresponding to the class of coupling illustrated in the table below.
We recommend the use of torque wrenches for tightening the screws and bolts on the machine.
Torques not binding N.m (Newton meters)
These pairs are reference values for normal metric threads according
to DIN ISO 261 and measures supporting heads according to DIN EN
ISO 4762, DIN ISO EM 4032, DIN EN ISO 4014 and DIN 931-2, 6912,
7984 and 7990. With these values obtains an exploitation of 90% of
the yield strength of the screws, on the basis of a coefficient of
friction equal to 0.14 (screw new, untreated, not lubricated).
Important: In extreme cases, e.g. screws lubricated with MOS2 and
coupling elements cadmium-plated on both sides, the value of torque
should be reduced by about 20%.
Couples test sockets for hexagonal screws
Tightening values for classes of coupling
according to DIN 267
