ISO 2491:1974廢止
Thin parallel keys and their corresponding keyways (Dimensions in millimetres)
出版：International Organization for Standardization
專家解讀視頻
Gives the material of the keys, gives the relation which should be observed between the diameter of shaft and the section of key, and is of general application for cylindrical shaft ends.
NFE 22 175:1987 - Similar
NFE 22 177:1987 - Similar
UNI 7510:1976 - Equivalent
NBN E 27 708:1974 - Identical
NBN E 27 709:1974 - Identical
PN 91/M-85002:1991 - Identical
KS B ISO 2491:2015 - Identical
KS B ISO 2491:2003 - Identical
