Self-Locking Fasteners; Recommendations For Reuse; Figure 14: Self-Locking Fasteners - PREVOST H3-41 Maintenance Manual

SECTION 00 : GENERAL INFORMATION

5.3 SELF-LOCKING FASTENERS

A self-locking fastener is designed with an
interference fit between the nut and bolt threads.
This is most often accomplished by distortion of
the top thread of an all-metal nut or bolt or by
using a nylon patch on the threads. A nylon
insert or the use of adhesives may also be used
as a method of interference between nut and
bolt threads (Figure 14).

FIGURE 14: SELF-LOCKING FASTENERS

5.4 RECOMMENDATIONS FOR REUSE

Clean, rust-free self-locking fasteners may be
reused as follows:
a) Clean dirt and other foreign matter from
the fastener;
b) Inspect the fastener to ensure there is no
crack, elongation, or other sign of fatigue
or over tightening. If there is any doubt,
replace with a new self-locking fastener of
equal or greater strength;
c) Assemble parts and hand start fastener;
d) Observe that, before the fastener seats, it
develops torque per the chart in table two.
If there is any doubt, replace with a new
self-locking fastener of equal or greater
strength;
e) Tighten the fastener to the torque
specified in the applicable section of this
manual;
Fasteners which are rusty or damaged should
be replaced with new ones of equal or greater
strength
.
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PA1615 Maintenance Manual All Series
00004
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Section 00 revised September 2016