光滑(hua)(hua)限孔(kong)用量規，產品規格：各種(zhong)(zhong)光滑(hua)(hua)塞規IT6級(ji)以上（含6級(ji)）直徑(jing)1.6~320mm各種(zhong)(zhong)光滑(hua)(hua)環規，對表圈：直徑(jing)φ8-400mm度為±0.002。