Mitutoyo 137-201 Inside Micrometer, 50 - 150mm

Mitutoyo Series 137 metric inside micrometers measure inside diameters from 50mm up to 1000mm. You screw extension rods onto a micrometer head to reach the size you need, and the rods are spring-mounted in protective sleeves. Toolrooms, quality control teams and machinists use them to check bores, cylinders and gaps.

Every model has a graduation of 0.01mm and a measuring span of 13mm. Graduation is the smallest step marked on the scale. Accuracy is a separate figure: it is the biggest error Mitutoyo allows, so do not read a fine graduation as a promise of that accuracy. The ranges differ in how many rods you get: 50 - 150mm has 3, 50 - 300mm has 5, 50 - 500mm has 6 and 50 - 1000mm has 8. Pick the largest bore you need to check.

Where this product is used

• Measuring bores, cylinders and gaps from 50mm up to 1000mm
• Toolroom and quality control inspection of inside diameters
• Machine shop and maintenance checks on large bores

Features

• Four ranges: 50 - 150mm, 50 - 300mm, 50 - 500mm and 50 - 1000mm
• Graduation of 0.01mm and a measuring span of 13mm
• Spindle feed error of 3µm
• Accuracy of ±(3+n+L/50)µm, where n is the number of rods and L the length measured in mm
• Rods are spring-mounted in protective sleeves
• Satin chrome thimble and sleeve 15mm in diameter
• Supplied in a fitted plastic case
• Carbide-tipped versions are sold under other codes

Key specifications

Choosing the right option