工(gong)字(zi)型(xing)平(ping)(ping)(ping)尺按(an)/T7977－99制造，材料(liao)為HT250，工(gong)作面采用(yong)刮(gua)研(yan)或(huo)jingmi磨(mo)削(xue)工(gong)藝，工(gong)字(zi)型(xing)平(ping)(ping)(ping)尺用(yong)于(yu)機床檢(jian)(jian)(jian)驗中檢(jian)(jian)(jian)驗不(bu)(bu)平(ping)(ping)(ping)度(du)和(he)不(bu)(bu)直度(du)兩個是配合(he)塊規、千分尺、水(shui)平(ping)(ping)(ping)儀等儀器檢(jian)(jian)(jian)測不(bu)(bu)同高(gao)度(du)兩導軌的(de)平(ping)(ping)(ping)行和(he)不(bu)(bu)連(lian)接導軌的(de)水(shui)平(ping)(ping)(ping)，并可以(yi)配合(he)直角尺，檢(jian)(jian)(jian)驗只用(yong)直角尺無(wu)法檢(jian)(jian)(jian)驗的(de)兩機件(jian)的(de)垂直度(du)的(de)量具。

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