J121 Applications

Description | Features | Specifications | Applications

Dynamic fastener vibration test: the Junker test
Fastener dynamic vibration testing allows engineers to develop safer products and validate the choice of fasteners for new bolted joint designs. Quality control technicians certify fasteners against self-loosening and investigate failures. Sales and marketing teams reassure customers with convincing demonstrations and benchmarking data. Professors and trainers use the Junker test to compare the different locking solutions and teach on the effects of vibration and resonance.

How to validate the choice of bolt and nuts in a new bolted joints designs?
Engineers can confirm their choice of fasteners by performing vibration tests reproducing the dynamic forces during service conditions. Testing either the entire assembly or the bolted joint with its locking element allows engineers to validate that the selected bolts and nuts will handle the transverse forces sustained during use.
Discover how to validate new bolted joint designs with the dynamic vibration test

Bolted joint post-failure analysis
Vibration and resonance can cause fasteners to come loose, leading to equipment failures and dramatic accidents. Dynamic fastener vibration tests assess how dynamic forces lead to the loss of bolt preload and help solve and prevent fastener self-loosening.
How do threaded fasteners self-loosen?

How to prevent a bolt from loosening?
Locking threaded fasteners is essential to prevent the loss of preload and self-loosening of the fastener. Engineers designing new bolted joints, fasteners manufacturers and distributors rely on the dynamic vibration tests results to compare the relative performance of fastener locking solutions. A suitable vibration test procedure will provide repeatable and reliable data, and make it possible to select the safest fastener self-locking solution.
How to conduct rigorous Junker vibration tests

Meet OEM requirements on fasteners safety
Original equipment manufacturers (OEM) specify fasteners and locking solutions that will resist to vibration for the lifetime of the bolted joints. The Junker transverse vibration test has become the standard for assessing and comparing fasteners self-loosening behaviour. ISO 16130, DIN 65151 and DIN 25201-4 B standards describe differing vibration test procedures that will help certify fasteners for OEM supply.
Comparison chart between ISO 16130, DIN 25201-4 and DIN 65151 standards

The most convincing way to show fastener resistance to vibration
A compelling demonstration is worth a thousand words.
Fastener manufacturers and distributors can reassure customers with live demonstrations and compare the resistance to vibration of different locking elements. For your next product launch and tradeshow, rent a J121 Fastener Test Bench to convince customers with stunning demonstrations.

Adopt a ‘learning-by-doing’ approach for better fastener trainings
Keeping sales and engineering teams up-to-date is essential. Enhance the trainees experience with dynamic fastener tests and compare the performance of different fastener locking solutions in varying conditions.

Demonstrate vibration and loss of preload to engineering students
University professors teaching mechanical engineering can demonstrate the effects of vibration with fastener vibration tests. Hands-on practical sessions help students understand what factors influence the self-loosening behaviour of fasteners and what are the most effective fastener locking solutions.