Couples de serrage dynamom.pdf

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General Instructions

00 00 Extract from company standard BMW N 600 02.0
The maximum tightening torques are:
Only applicable to shaft screws with metric standard and fine threads acc. to
DIN 13, sheet 13 and nuts with height of 0,8 x d acc. to DIN 934 and only for a µ
total = 0.125 (screws phosphatized, screws untreated or galvanized. Lubrication
condition: unlubricated and also oiled).
For cadmium-plated screws or nuts (µ total = 0.08 to 0.09) the tightening torque
with screw material at the same level of utilization ca. must be 30% less than
shown in the table.
The values specified in this table apply to all screw connections conforming to the
aforementioned conditions.
Not applicable when using a different surface or lubricant condition on the thread,
or if the height of the nut differs.
Not applicable to necked-down bolts, self-tapping screw connections or to
connections between parts made of different materials.
Maintaining specified tightening torques is vital for performing repair work to a
professional standard. This presupposes that the torque wrenches required for this
are subjected to a regular inspection. Approved torque testing equipment is listed
in the catalogue of workshop equipment planning documents.