https://www.sinostoneltd.com/black-studs/
Sunday, January 22, 2017
Black studs for welding | Leading mfg of black studs | Sino Stone
Black studs are one of shear studs with black coating, which are boring about 2~3 hours after produced by cold forging machine, the raw material and producing process are same as normal shear studs.
https://www.sinostoneltd.com/black-studs/
https://www.sinostoneltd.com/black-studs/
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