materials used to from the lock become distorted after the initial installation and
removal. Discard and replace self-locking fasteners after removing them. Do not
replace self-locking fasteners with standard fasteners.
Washers
The two basic types of washers are flat washers and lock washers. Flat washers
are simple discs with a hole to fit a screw or bolt. Lock washers are used to prevent a
fastener from working loose. Washers can be used as spacers and seals. Or can help
distribute fastener load and prevent the fastener from damaging the component
As with fasteners. When replacing washers make sure the replacement washers
are of the same design and quality
Cotter Pins
A cotter pin is a split metal pin inserted into a hole or slot to prevent a fastener
from loosening. In certain applications, such as the rear axle on an UTV or motorcycle,
the fastener must be secured in this way. For these applications. A cotter pin and
castellated (slotted) nut is used.
To use a cotter pin, first make sure the diameter is correct for the hole in the
fastener. Aster correctly tightening the fastener and aligning the holes, insert the cotter
pin through the hole and bend the ends over the fastener, Unless instructed to do so,
never loosen a tightened fastener to align the holes. If the holes do not align. Tighten
the fastener enough to achieve alignment
Cotter pins are available in various diameters and lengths. Measure the length
from the bottom of the head to the tip of the shortest pin
Snap Rings and E-clips
Snap rings (Figure 1) are circular-shaped metal
retaining clips. They secure parts in place on parts
such as shafts. External type snap rings are used to
retain items on shafts. Internal type snap rings secure
parts within housing bores. In some applications. in
addition to securing the component(s). snap rings of
varying thicknesses also determine endplay. These are
usually called selective snap rings.
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