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Metric Low-Strength Steel Spring-Stop Locknuts—Class 6

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Metric Low-Strength Steel Spring-Stop Locknuts—Class 6 Metric Low-Strength Steel Spring-Stop Locknuts—Class 6 These locknuts, also known as Fuji locknuts, maintain their holding power with reuse longer than nylon-insert locknuts. They have a spring ring that creates tension as you tighten the nut, keeping them in place.