Section 2
Issue 1 Page 6
17 The majority of fastenings have washers
inserted between the nut and or bolt head and
the item being secured. Spring washers or lock
washers are usually placed next to the bolt head
or nut then the plain washer. As a general rule
the following washers are used as detailed:
• Plain washer. To protect the surface and
spread a load when attaching to a soft
material such as glass fibre or aluminium.
• To adjust the spacing of one component
to another use plain washers of
appropriate thickness and external
diameter.
• To present a uniform surface on which to
tighten a fastening onto a rough or
irregular surface.
• Spring washer. To lock a thread where
there is a possibility of the nut or bolt
working loose. Not used with a nyloc nut.
• Large diameter, thin plain washer. To
spread a load onto very thin material.
• Large diameter plain washer. To prevent
migration (sideways movement) of rubber
bushes.
• The large 1/2" plain chamfered washers
are often used in conjunction with the
metallistic suspension bushes. Where
this is the case the chamfered edge must
be fitted towards the bush to prevent
contact with the outer metal part of the
bush.
18 Particular care should be taken to ensure
that the correct fastening is being used, since it
is possible to use an overlong bolt only to find
that it is apparently missing when the only
remaining bolts are too short.
19 The majority of fasteners supplied by
Caterham are in polythene bags with an A4
sheet on a card insert, Fig 3 refers. The A4
sheet can be used to confirm that the contents
are correct. Each pack has a unique number,
located at the top RH corner and each item
within the pack can be identified by a number at
the bottom LH corner of the part number box.
Where fasteners are specified in the text, the
unique pack number will be stated the first time
it is required along with the description and the
Item Identification number in brackets. The next
time an item from that pack is required it will be
identified by description and the Item
Identification number only, for example:
• Bolt (fastener pack ZGB03, Item (2))
identifies the Bolt 12 mm x 40 mm. At a
later point in the text Setscrew (4)
identifies the setscrew 12 mm x 25 mm.
