方箱按JB/T3411.56-99标准制造，材料HT200，用于零部件平行度、垂直度的检验和划线，万能方箱用于检验或划精密工件的任意角度线。精度分为1、2、3三个等级。规格:(mm)100 ---- 600。主要用于零部件的平行度、垂直度等的检验和划线。方箱是用或钢材制成的具体6个工作面的空腔正方体，其中一个工作面上有V型槽。方箱检定的环境条件：常温、常湿。对于刮制方箱除检定平面度外，还要用涂色法检定接触斑点。Side box requires face can not have rust, scratches, cracks, dents and other defects affecting the measure performance, non-face should be clean sand painting, edge chamfering. There should be signs in the side wall inside, and marked with standard dimensions, level serial number, manufacturer name.
Square box test method: For a side length of 315mm and below the square box, test boxes were seized when the side face of the ends of each block to place the amount of 1mm, knife lip ruler on the amount of block work surface, then in its The amount to be discreet office block test plug, equivalent block group had just squeezed at both ends of the size and volume when the block size to be discreet on the difference between the two ends of the deviation between. This test should be in square boxes face vertical, horizontal and diagonal direction on several sections. Various locations in the measured error in the same direction in a straight line when whichever is maximum, when the error is inconsistent whichever direction the maximum difference being difference with the largest absolute value and negative, for the inspected surface plane of the plane.

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