工(gong)字(zi)型平尺(chi)按/T7977－99制造，材料為HT250，工(gong)作面采(cai)用刮研或jingmi磨削(xue)工(gong)藝(yi)，工(gong)字(zi)型平尺(chi)用于機床檢(jian)(jian)驗(yan)中檢(jian)(jian)驗(yan)不(bu)(bu)平度(du)和不(bu)(bu)直(zhi)度(du)兩個(ge)是(shi)配合(he)塊(kuai)規、千分尺(chi)、水平儀等儀器檢(jian)(jian)測不(bu)(bu)同高度(du)兩導(dao)軌(gui)的平行(xing)和不(bu)(bu)連接導(dao)軌(gui)的水平，并(bing)可以配合(he)直(zhi)角尺(chi)，檢(jian)(jian)驗(yan)只用直(zhi)角尺(chi)無(wu)法檢(jian)(jian)驗(yan)的兩機件(jian)的垂直(zhi)度(du)的量具。

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