GB/T 6414-1999 Translated English of Chinese Standard (GBT 6414-1999, GB/T6414-1999, GBT6414-1999): Castings - System of dimensional tolerances and machining allowances
https://www.chinesestandard.net, 2017 M02 3 - 20 pages
This Standard specifies a system of tolerance grades and required machining allowance grades for the dimensions of castings. This Standard is applicable to the dimensions of cast metals and their alloys produced by various casting manufacturing processes.
Position of tolerance zone
Indication on drawings
Annex A informative Casting tolerances
Annex B informative Required machining allowance grades RMA
absolute value alloys Zinc alloys Annex applied to processes casting basic dimension castings Tolerance grade Copper alloys Zinc CT1 to CT15 dimension Figure dimension of castings dimension range Draft angle final machining Finished dimension foundry grades CT1 grades finer Grey iron S. G. individual tolerances International Standard Investment casting iron Copper alloys iron Malleable iron iron S. G. iron Largest overall dimension limit of size long series machining allowance grades machining allowances RMA Malleable iron Copper Maximum limit member bodies Metallic permanent mould mismatch Maximum mismatch necessary machining allowance normally be expected Pressure die casting processes and materials Raw casting basic raw castings Tolerance required machining allowance S. G. iron Malleable series and mass Steel Grey iron table B1 table by agreement Tapered features Technical Committee tolerance grades indicated tolerance zone tolerances and machining tolerances GB/T Unless otherwise specified Wall thickness Zinc alloys Light