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Locknut Trouble Shooting
Tech Support
Locknut Trouble Shooting
Locknut Application and Technology FAQ
What is the finish of the mating Bolt?
The performance
characteristics of the assembly are highly dependent on plating’s.
What is the grade or class of the mating bolt?
The mating
bolt grade or class should be equivalent to the Locknut grade or class.
Example:
Grade A Nut = Grade 2 Bolt
Grade B/F = Grade 5 Bolt
Grade C/G
Nut = Grade 8 Bolt
What is the locknut rundown length?
A long rundown length can
lead to high prevailing torque or galling issues.
What is the speed of the installation?
High-speed
installation can lead to high prevailing torque or galling issues. (IFI 100/107
recommends 30-rpm max for testing purposes.)
Is additional lubrication added during final application
assembly?
Additional wax, oil or other chemicals added during
assembly can lead to reduced or increased prevailing torque and changes in clamp
load.
Application Troubleshooting
When an application complaint involves product quality or performance, the following
list of questions should be considered in an effort to understand the reason and scope
of the problem being experienced. Information in RED provides insight to
industrial standards and good practices. Supplying this information to Aztech QA will
allow us to assist effectively.
Who is the locknut supplier? What
is the lot number? Part number?
How do you describe the problem
condition?
How many parts in the lot have been used?
Evaluated?
How many or what percentage of parts have the
problem condition described in the complaint?
Products processed to industrial standards have an allowance for
limited quantities of non-conforming parts.
What is the grade or
class of the mating bolt?
The mating part grade or
class should be equivalent to the locknut grade or class as indicated in the following
table.
Nut Grade | Bolt Grade | Nut Class | Bolt Class | |
A | 2 | 8 | 8.8 | |
B | 5 | 9 | 9.8 | |
C | 8 | 10 | 10.9 |
What is the finish of the mating part?
Each plating type has a unique friction characteristic and when
combined with the mating part plating friction characteristics, a variety of locking
torque spreads can result. The locking product has been manufactured and tested
with mating parts plated as required by the applicable locking
specification.
What is the speed of the
installation?
High speed installation can lead to
high prevailing torque or galling issues. IFI 100/107 recommends 30 rpm max for
testing purposes, as parts increase in diameter over 1” they should be assembled
progressively slower.
Has the assembly process or mating part
changed recently?
Changing the application,
mating part supplier, plating or installation speed can change the characteristics of
the assembly.
How far down the mating part is the locknut
installed?
A long rundown length, (over an inch),
can lead to unpredictable prevailing torque or galling
issues.
Is additional lubrication added during final application
assembly?
Additional wax, oil or other compounds
added before or during assembly can lead to reduced or increased prevailing torque
and/or clamp load.
Are documented test reports, pictures or
drawings of the nut and mating part available?
Can you send
Aztech examples of the parts that are in question along with mating parts?
What
is the urgency to evaluate and resolve the complaint? Should a backup order be placed
now?
Who should be contacted for follow-up regarding this issue?