光(guang)(guang)滑(hua)限孔用(yong)量規，產品規格：各(ge)種(zhong)光(guang)(guang)滑(hua)塞規IT6級以上（含6級）直(zhi)(zhi)徑1.6~320mm各(ge)種(zhong)光(guang)(guang)滑(hua)環規，對表圈：直(zhi)(zhi)徑φ8-400mm度為(wei)±0.002。