This standard refers to the dimensional tolerances and related machining allowances of gray cast iron castings (see UNI 5007 and UNI 5330), cast in sand or earth, obtained with normal manufacturing processes and equipment (models, boxes 'soul).
UNI 7068-1983 history
1983UNI 7068-1983 Non-alloy gray iron castings are cast in molding sand or soil. Offset values without deviation and machining allowance specification
1972UNI 7068-1972 Non-alloy gray iron sand casting castings. Offset value without deviation specification