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All calculations
in this section are based on SAE Grade 8 strength values. Fasteners
of this strength or greater are recommended for all applications of
bearings with significant tilting moment loading. Fasteners should be
tightened to provide prestress of 75-80% of proof load. For applications
subject to repetitive loading, the active fastener length should be
at least 4 times diameter. Coarse thread fasteners are recommended.
Avon Bearings recommends that fasteners be identified with means of
traceability to the manufacturer as well as the standard SAE grade code.
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| Washers |
Avon
Bearings recommends that
hardened steel flat washers be used under all bolt heads
and nuts.
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| Nuts |
Nuts should
be of the same quality and grade as bolts.
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| Compressive
Mountings |
| All designs
on this site presume that the bearings is mounted in compression.
If bearing is to be mounted in tension, please refer to Avon
Engineering, and note that in addition to requiring additional
fasteners, substantial
changes in internal geometry may be required for tension mounted
applications. |
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This table provides
maximum recommended
fastener load values for each of the following conditions:
Fatigue
Loading - A
consistently high moment loading applied day in and day
out. Examples
of fatigue loading would be industrial machine tool and other
dynamic applications.
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Intermittent
Loading -
An occasional high moment loading applied at inconsistent intervals,
such as truck mounted cranes. This load rating should be limited
to 20,000 cycles. If the bearing bolts are to be subjected to
more than 20,000 cycles, fatigue load rating should be utilized.
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| Maximum
Loading - Under
this loading, a one time test load can be undertaken. This
load
will cause the fastener material to approach its stress limit
or the beginning of joint separation to occur. CAUTION:
THIS LOADING SHOULD NEVER BE EXCEEDED. |
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