Vibration can loosen a bolted joint when preload, surface condition or locking method is mismatched. This guide gives a practical review sequence for equipment buyers and maintenance teams.
Start with the Joint
Record the clamped materials, joint thickness, bolt diameter, strength class and tightening method. Check whether the joint is subject to transverse motion, repeated impact or temperature cycling. The locking part should support a sound joint design rather than compensate for insufficient preload.
Use the fastener product catalog to shortlist compatible bolt, nut and washer combinations, then compare the bolt and nut grade guide before requesting a quotation.
Choose a Locking Approach
- Prevailing-torque nuts suit assemblies where the nut must resist rotation after installation.
- Serrated or wedge-locking washers require matching contact surfaces and an agreed installation method.
- Thread-locking compounds need a defined application process and service-temperature check.
Confirm the applicable DIN, ISO, GB or customer standard, and ask the supplier to state the locking component and finish on the order acknowledgement.
Define Inspection and Installation
Include the target preload or torque method, lubricant condition, tightening sequence and inspection frequency in the work instruction. For critical joints, agree how torque, tension or loosening performance will be verified.
For a broader failure review, read our spring-washer failure analysis. Send the drawing, joint loads and service environment through the technical enquiry form so the specification can be checked before production.