Loctite when placing racing seat with seat bracket?
01-27-2017, 06:08 AM
#11
Lock washers
The typical helical spring washer shown in figure 14 is made
of slightly trapezoidal wire formed into a helix of one coil so
that the free height is approximately twice the thickness of the
washer cross section. They are usually made of hardened
carbon steel, but they are also available in aluminum, silicon,
bronze, phosphor-bronze, stainless steel, and K-Monel.
The lockwasher serves as a spring while the bolt is being
tightened. However, the washer is normally flat by the time
the bolt is fully torqued. At this time it is equivalent to a solid
flat washer, and its locking ability is nonexistent. In summary,
a lockwasher of this type is useless for locking.
The typical helical spring washer shown in figure 14 is made
of slightly trapezoidal wire formed into a helix of one coil so
that the free height is approximately twice the thickness of the
washer cross section. They are usually made of hardened
carbon steel, but they are also available in aluminum, silicon,
bronze, phosphor-bronze, stainless steel, and K-Monel.
The lockwasher serves as a spring while the bolt is being
tightened. However, the washer is normally flat by the time
the bolt is fully torqued. At this time it is equivalent to a solid
flat washer, and its locking ability is nonexistent. In summary,
a lockwasher of this type is useless for locking.
Last edited by SlowTeg; 01-27-2017 at 06:11 AM.
01-27-2017, 12:42 PM
#12
There are two ways fasteners are locked in place: preventing the threads from loosing tension from vibration and preventing the bolt from turning. Safety wire and cotter pins are ways of preventing a bolt from turning, Nyloc nuts and Loctite are ways to prevent the tension from dropping from vibration. Serrated flange nuts and bolts dig into the items them are fastening. Connecting rod bolts don't use anything. However, they are torqued until the bolt has specific tension measured by its elongation. The helical washers provide a little force opposite the direction of rotation to loosen, but the force is minimal, and when the bolt is torqued non-directional.
The NASA manual also covered other washers:
Tooth (or Star) Lockwashers
Tooth lockwashers (fig. 15) are used with screws and nuts
for some spring action but mostly for locking action. The teeth
are formed in a twisted configuration with sharp edges. One
edge bites into the bolthead (or nut) while the other edge bites
into the mating surface. Although this washer does provide
some locking action, it damages the mating surfaces. These
scratches can cause crack formation in highly stressed
fasteners, in mating parts, or both, as well as increased
corrosion susceptibility.
Belleville Washers
Belleville washers (fig. 12) are conical washers used more
for maintaining a uniform tension load on a bolt than for
locking. If they are not completely flattened out, they serve
as a spring in the bolt joint. However, unless they have
serrations on their surfaces, they have no significant locking
capability. Of course, the serrations will damage the mating
surfaces under them. These washers can be stacked in
combinations as shown in figure 13 to either increase the total
spring length (figs. 13(
The NASA manual also covered other washers:
Tooth (or Star) Lockwashers
Tooth lockwashers (fig. 15) are used with screws and nuts
for some spring action but mostly for locking action. The teeth
are formed in a twisted configuration with sharp edges. One
edge bites into the bolthead (or nut) while the other edge bites
into the mating surface. Although this washer does provide
some locking action, it damages the mating surfaces. These
scratches can cause crack formation in highly stressed
fasteners, in mating parts, or both, as well as increased
corrosion susceptibility.
Belleville Washers
Belleville washers (fig. 12) are conical washers used more
for maintaining a uniform tension load on a bolt than for
locking. If they are not completely flattened out, they serve
as a spring in the bolt joint. However, unless they have
serrations on their surfaces, they have no significant locking
capability. Of course, the serrations will damage the mating
surfaces under them. These washers can be stacked in
combinations as shown in figure 13 to either increase the total
spring length (figs. 13(
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