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Digital Outside Micrometers for Small Holes, Grooves, and Keyways
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Find the outer dimensions of grooves in pins and other small parts, then quickly view your readings. The anvil and spindle are as thin as a pencil point to slip into narrow spaces where standard ones won't fit.
With an LCD display, these micrometers give instant measurements—no need to read scales. Swap between inch and metric or set the position to zero, all with the press of a button. You don't need to reset the zero point since they retain their position when turned off, also known as absolute (ABS) positioning.
Mitutoyo—The go-to for machinists and engineers. Every part is made within a Mitutoyo automated factory and tested in-house in Japan. The spindle glides as you turn the thimble with a weighty, silky-smooth feel.
Calibration Certificate—Choose these micrometers when precision measurements are required for quality control or by regulation. The certificate is traceable to NIST, so you can be confident your measurements are correct and consistent.
Ratchet-Stop Thimble—Best for consistent, repeatable measurements. The spindle stops extending the moment it reaches your part, so it won’t overtighten. Hear and feel a satisfying click that confirms you’ve applied the right amount of pressure.
Measuring Range | Accuracy | Measuring Increments | Outside Micrometers with Calibration Certificate | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Inch | Metric, mm | Inch | Metric | Inch | Metric, mm | Thimble Type | Spindle Point Angle | Throat Dp. | Frame Material | Measuring Functions | Mfr. Model No. | Each | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Mitutoyo | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Without SPC Data Output | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
0" to 1" | 0 to 25.4 | ±0.0001" | ±0.0025 mm | 0.00005" | 0.001 | Ratchet Stop | 15° | 1.26" | Cast Iron | Zero-Position Memory (ABS) | 342-351-30 | 00000000 | 0000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() Outside Micrometer for Grooves and Keyways with NIST Certificate and LCD Display, Mitutoyo 342-351-30 EachDelivers tomorrow 7-9 am | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||