J1237_202111 Metric Thread Rolling Screws

This SAE Standard has been revised. In this current revision, the significant changes from the previous 2017 revision include: reducing and limiting the maximum core hardness limit of Type 2 screws to 36 HRC; revising the hydrogen embrittlement testing requirements and methods (3.7.4 and 4.9) to reflect up-to-date understanding and practices related to hydrogen embrittlement; and revising the unthreaded underhead distance to establish more definitive measuring points and prevent rolling into the fillet radius.