Fowler 52-236-005-1, 4 - 5" Inside Tubular Micrometer

Includes wrench and case Travel Tubular Inside Micrometers measure inside dimensions precisely and accurately. Features Carbide faced measuring tips are spherical to make positive point contact against the inside wall surface. Anvil and spindle are hardened and precision ground with microlap finish on ends. Spindle thread hardened, ground & lapped. Accuracy: .00024" Microfine graduations (.001") on a satin chrome finish permit easy reading. Positive locking nut Each micrometer can also be used as an adjustable linear standard bar within each range. Quick, easy zero adjustment on the sleeve. Meets or exceeds Federal accuracy specs. It is recommended for optimal accuracy that the inside micrometer be calibrated by a gage blocks or ring gage.