Design engineers who build custom inspection fixtures often utilize micrometer heads as adjustable stops or measuring probes. JIS B 7420 provides the necessary geometric dimensions (mounting thread sizes, stem diameters) required to design the fixture correctly. Attempting to design a fixture without the standard risks machining holes that do not fit the equipment.
The standard, most recently revised in 1997, is aligned with international guidelines such as . It is designed to ensure that parts produced in mechanical engineering meet specific tolerance grades, typically from IT6 to IT16 as defined in JIS B 0401. jis b 7420 pdf
JIS B 7420 also defines the gauge plane – a specific location along the taper where the diameter is measured. If you ignore the gauge plane, your tool will either bottom out or wobble. Design engineers who build custom inspection fixtures often