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Snap Ring External 0.551" Stainless Steel pack of 100 pcs is an essential fastener for any project. Item thickness of 0.035" and free diameter of 0.509" . For groove depth of 0.016" , groove width of 0.039" , groove diameter of 0.519". It´s finished is plain and have a hardness between HRC 42 ÷ 52. Model is SH-55 SS.