FIELD: measurement technology. SUBSTANCE: try square is intended to test angles of 90 deg. It is composed of base and rule placed in groove of base. Rule is attached to base by means of screw. Tightening effort increases thanks to making of axial nonround, for instance, hexagonal through hole for key. Presence of abrasive powder between surfaces of rule and base facing each other enables loading capability of try square to be enhanced. EFFECT: improved reliability of try square. 4 cl, 4 dwg
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