工(gong)字(zi)型(xing)平(ping)尺(chi)按(an)/T7977－99制造(zao)，材料為HT250，工(gong)作面采(cai)用(yong)(yong)刮研(yan)或(huo)jingmi磨削工(gong)藝，工(gong)字(zi)型(xing)平(ping)尺(chi)用(yong)(yong)于機(ji)(ji)床檢(jian)驗中檢(jian)驗不(bu)平(ping)度和(he)不(bu)直(zhi)度兩(liang)個是(shi)配合塊規、千分(fen)尺(chi)、水(shui)平(ping)儀(yi)等儀(yi)器檢(jian)測不(bu)同(tong)高(gao)度兩(liang)導(dao)軌(gui)的平(ping)行和(he)不(bu)連接導(dao)軌(gui)的水(shui)平(ping)，并(bing)可以配合直(zhi)角尺(chi)，檢(jian)驗只用(yong)(yong)直(zhi)角尺(chi)無法檢(jian)驗的兩(liang)機(ji)(ji)件的垂直(zhi)度的量具。

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