工(gong)字型平尺(chi)(chi)按/T7977－99制造(zao)，材(cai)料為HT250，工(gong)作(zuo)面采用(yong)刮研或jingmi磨削工(gong)藝，工(gong)字型平尺(chi)(chi)用(yong)于機床檢(jian)驗(yan)中檢(jian)驗(yan)不(bu)(bu)平度(du)和不(bu)(bu)直度(du)兩個是(shi)配(pei)合塊規、千分尺(chi)(chi)、水(shui)平儀等儀器(qi)檢(jian)測(ce)不(bu)(bu)同高度(du)兩導軌的平行和不(bu)(bu)連接(jie)導軌的水(shui)平，并可以配(pei)合直角(jiao)尺(chi)(chi)，檢(jian)驗(yan)只用(yong)直角(jiao)尺(chi)(chi)無(wu)法檢(jian)驗(yan)的兩機件的垂直度(du)的量(liang)具(ju)。

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