SECTION 00: GENERAL INFORMATION
DOB 2490-2789
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X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
11
5.2 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 11).
FIGURE 11: SELF-LOCKING FASTENERS
00004
5.3 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
overtightening. 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.
5.4 SIX LOBED SOCKET HEAD
Six lobed socket head (Torx) fasteners are used
in some applications on vehicles covered in this
manual. The tools designed for these fasteners
are available commercially. However, in some
cases, if the correct tool is not available, a hex
socket head wrench may be used.
