Section 1 - General Information
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9803-6530
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Torque Settings
Introduction - Zinc Plated Fasteners and Dacromet Fasteners
Some external fasteners on machines are assembled
using an improved type of corrosion resistant finish. This
type of finish is called Dacromet and replaces the original
Zinc and Yellow plating used on earlier machines.
The two types of fasteners can be readily identified by
colour and part number suffix as follows:
Note:
As the Dacromet fasteners have a lower torque
setting than the Zinc and Yellow fasteners, the torque
figures used must be relevant to the type of fasteners.
Note:
A Dacromet bolt should not be used in conjunction
with a Zinc and Yellow plated nut, as this could change the
torque characteristics of the torque settings further. For
the same reason, a Dacromet nut should not be used in
conjunction with a Zinc and Yellow plated bolt.
Note:
All bolts used on JCB machines are high tensile and
must not be replaced by bolts of a lesser tensile
specification.
Note:
Dacromet bolts, due to their high corrosion
resistance are used areas where rust could occur.
Dacromet bolts are only used for external applications.
They are not used in application such as gearbox and
engine joint seams or internal applications.
Fastener Type
Colour
Part Number
Zinc and Yellow
Golden finish
‘Z’ (e.g. 1315/3712Z)
Dacromet
Mottled silver finish
‘D’ (e.g. 1315/3712D)
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