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SAE J 121-1997 (SAE J121-1997)

Decarburization in Hardened and Tempered Unified Threaded Fasteners

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.

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