The document applies to internal micrometers for dimensions up to 500 mm, with a maximal measuring range of 25 mm and a scale interval and a resolution of 0,01 mm respectively. It specifies the most important dimensional, functional and quality characteristics of internal micrometers and their testing.#,,#
DIN 863-4:1999 history
1999DIN 863-4:1999-04 Verification of geometrical parameters - Micrometers - Part 4: Internal micrometers; concepts, requirements, testing
1999DIN 863-4:1999 Verification of geometrical parameters - Micrometers - Part 4: Internal micrometers; concepts, requirements, testing
1970DIN 863-4:1981 Verification of geometrical parameters - Micrometers - Part 4: Internal micrometers; concepts, requirements, testing