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Simple Test Technique to Determine Type of Fastener Loosening

Bolted joints are extremely reliable through the life of the product, as long as the bolt remains tight. Unfortunately, bolts often loosen when placed in service, and they can become a source of reliability problems. Understanding whether a bolt loosened due to self-loosening, relaxation or a combination of both is critical for making the right design changes or choosing the best thread locking method. Fortunately, a simple torque stripe can used to detect if a bolt loosened and if so, the type of loosening that occurred.

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