JIS B0251-2008《米制粗牙螺纹极限量规》

This Standard specifies the limit gauges used for the dimensional inspection of metric
screw threads specified in JIS B 0205-2 (hereafter referred to as "limit gauges for screw
threads"), and gauges used for checking and setting of them (hereafter referred to as
"check gauges and setting gauges") (The limit gauges for screw threads, the check gauges
and the setting gauges are collectively referred to as "gauges" simply).
Other inspection methods, for example, the measurement by the indicating instru-
ment may be used; however, the inspection using gauges specified in this Standard
always takes precedence.
This Standard aims to specify the means to discriminate the workpiece threads
within the permissible limit sizes from others.
The following principles shall apply to ensure the interchangeability of the workpiece
threads and to avoid disputes between the manufacturer and the purchaser.
a) The manufacturer shall not deliver any workpiece thread whose thread sizes (for