Inside Micrometers | McMaster-Carr

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Inside Measuring Length

220 Products

Measuring and Inspecting

Inside Hole Micrometers

Find the inside diameter of cylinders and rings

29 products

Bore Gauges

Insert into a hole and expand the contacts to measure diameter

120 products

Inside Hole Micrometer Handles

Screw into your micrometer head to extend its reach for measuring deep holes

1 product

Inside Hole Calipers

Measure hard-to-reach areas, such as internal grooves and slots

12 products

Bore Gauge Heads

Swap the head on your Mitutoyo electronic bore gauge for one with a different measuring range

19 products

Inside Hole Micrometer Spacing Collars

Replace the collar on your micrometer to connect extension rods

1 product

Inside/Outside Diameter Gauges

Mount your variance indicator to measure the diameter of rims, grooves, and shallow holes

2 products

Chamfer Gauges

Check the diameter of chamfered edges to make sure they're within tolerance

21 products

Countersink Gauges

Catch sizing errors in countersunk holes to keep fasteners from protruding and creating weak points

19 products