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Mitutoyo Inside Hole Micrometers
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Measure the inside diameter of cylinders and rings. These micrometers have a plain thimble for smooth, continuous adjustment without a ratchet or friction stop. Experienced machinists often prefer them because they can judge the pressure needed to ensure a precise fit. To measure a wider range of sizes, attach the included extension rods to the micrometer head. The larger the range, the more extension rods and head travel you get. However, accuracy will be looser.
Mitutoyo Inside Hole Micrometers for Grooved Surfaces
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Reach into bores to measure the precise size and location of grooves. These micrometers have two discs on their measuring spindle to find a groove’s edge. Slide the spindle into your bore, press the discs against the wall and into the groove, and twist the thimble to measure the distance between the two discs. A speeder knob moves the measuring spindle more quickly toward or away from your groove, without turning the thimble repeatedly. When the spindle touches the groove you’re measuring, it will stop tightening, but the speeder knob will continue turning with a clicking sound. The spindle doesn’t rotate, so the contact points won’t spin or slip out of a groove.
Measuring Range | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Inside Lg. | Outside Lg. | Accuracy | Measuring Increments | Material | Overall Lg. | Mfr. Model No. | Each | |||
Ratchet-Stop Thimble—Nonrotating Spindle | ||||||||||
| 0.055" to 1.05" | 0" to 1" | ±0.0004" | 0.001" | Steel | 9 1/2" | 146-232 | 5556N11 | 0000000 | ||
| 1.05" to 2.05" | 1" to 2" | ±0.0004" | 0.001" | Steel | 9 1/2" | 146-233 | 5556N12 | 000000 | ||
| 2.05" to 3.05" | 2" to 3" | ±0.0004" | 0.001" | Steel | 9 1/2" | 146-234 | 5556N13 | 000000 | ||
| 3.05" to 4.05" | 3" to 4" | ±0.0004" | 0.001" | Steel | 9 1/2" | 146-235 | 5556N14 | 000000 | ||
Mitutoyo Digital Inside Hole Micrometers
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With an LCD screen, these micrometers make it easy to read inside diameter measurements taken from cylinders and rings. Place the micrometer inside your bore, then turn the thimble until the spindle makes contact with both sides. For an accurate reading, stop turning as soon as you feel resistance on the thimble.
Distance Measured Range | Accuracy | Measuring Increments | Material | No. of Extension Rods | Extension Rod Dia. | No. of Heads | Head Travel | Batteries Included | Mfr. Model No. | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
303 Series—Plain Thimble | |||||||||||||
| 8" to 40"; 204 mm to 1,016 mm | ±0.0015", ±0.040 mm | 0.0001", 0.001 mm | Steel | 6 | 5/8" | 1 | 1" | Yes | 339-303 | 5609N11 | 000000000 | ||
