I've recently specified some 1.25" SA-574 (Gr. 4037, 4042, 5137M, 51B37M, 4140, OR 4340) socket head screws for a project that needs to meet Sec. VIII-1. According to Figure UHT-6.1, the bolting must meet 15 mils of lateral expansion. This is inline with Interpretation VIII-1-10-20.
My supplier has tried numerous heat treatments (at MDMT = -20F) and keeps coming short (although close) of meeting the lateral expansion requirements. This is a reputable shop that manufactures code compliant products regularly.
Have any of you specified this bolting for a Section VIII-1 applications? Is this bolting basically not used in Section VIII applications? Did you have any trouble meeting the lateral expansion requirements? Any thoughts or suggestions?
My supplier has tried numerous heat treatments (at MDMT = -20F) and keeps coming short (although close) of meeting the lateral expansion requirements. This is a reputable shop that manufactures code compliant products regularly.
Have any of you specified this bolting for a Section VIII-1 applications? Is this bolting basically not used in Section VIII applications? Did you have any trouble meeting the lateral expansion requirements? Any thoughts or suggestions?