Fayat Group BOMAG BW 226 BVC-5, Руководство по обслуживанию

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Nut height below 0,5 d (d = nominal dimension).
Identification in clock system
For small nuts
Ä
Fig. 37 the clock system can be used for identifi-
cation.
n
The 12 o'clock position is identified by a dot or the manufactur-
er's symbol.
n
The strength class is identified by a dash (b).
1.3.1.1.10 Identification of UNF-threads
Identification of UNF-threads
Studs (1)
At the outmost end a short end of the component is reduced to its
core diameter.
Nuts (2).
An uninterrupted series of stamped in circles parallel to the axis of
the nut on a hexagon area.
Screws (3)
The screw head is marked with a stamped in, round cavity.
1.3.1.2 Tightening torques
The values specified in the table apply for screws:
n black oiled
n with surface protection A4C
n with surface protection DACROMET
DACROMET is a surface protection that mainly
consists of zinc and aluminium in a chromium
oxide matrix. DACROMETIZATION provides excel-
lent corrosion protection for metal surfaces by
applying a mineral coating with metallic-silver
appearance.
The difference between Withworth and UNF/UNC
threads is the fact that UNF and UNC threads have
60° flanks, as the metric ISO-thread, whereas
Withworth has a flank of only 55°.
Fig. 37: Identification of nuts in clock
system
Fig. 38
General – Maintenance and repair
BW 226 BVC-5 / BW 226 DI-5 50