Fowler 52-243-220-1 2" - 20" Inside Micrometer

2" - 20" Inside Micrometer

Fowler extension rod type Inside Micrometers have a wide measuring range-any one single micrometer can replace many bar type inside micrometers.

Includes:

• inside micrometer head and a series of fully hardened and lapped extension rods of different lengths all with carbide measuring faces
• wrench
• case

Features:

• Anvil and spindle are hardened and precision ground with microlap finish on ends.
• Spindle thread hardened, ground & lapped.
• Microfine graduations on satin chrome.
• Positive locking nut on spindle.
• It is recommended that the inside micrometer with a rod be calibrated by a micrometer or ring gage.
• Coiled spring pressure contact type rods are each marked with appropriate length.
• Quick, easy zero adjustment on the sleeve.
• Accuracy = .00005" x (3 + L"/2)
• Meets or exceeds Federal accuracy specs.
• Reference standard included with set.