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SAE J121M

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SAE J121M 2013 Edition, January 1, 2013 Decarburization in Hardened and Tempered Metric Threaded Fasteners
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Description / Abstract: This SAE Recommended Practice covers methods for measuring, classifying, and specifying decarburization in the threaded section of hardened and tempered steel bolts, screws, studs, and similar parts. It is not intended to cover products which are specifically carburized to achieve special properties.