JIS B4648-2008《内六角扳手》

This Standard specifies the hexagon socket screw keys (hereafter referred to as
"screw keys").
Screw keys of this Standard shall be used for tightening of hexagon socket head
screws for property class specified in JIS B 1051 and _j.!.S__B___!0_54-!., and for tighten-
ing of hexagon socket set screws for property class specified in JIS B 1053 and JIS_B
1054-3.
NOTE ~ The International Standard corresponding to this Standard is as follows.
ISO 2936: 2001 Assembly tools for screws and nuts--Hexagon socket screw
keys (MOD)
In addition, symbols which denote the degree of correspondence in the
contents between the relevant International Standard and JIS are IDT
(identical), MOD (modified), and NEQ (not equivalent) according to ISO/
IEC Guide 21.