Mitutoyo 422-230-30 Digimatic Blade Micrometer

Technical Overview

Professional 0-25mm digital blade micrometer featuring a 0.75mm Type A blade, non-rotating spindle, ±3µm accuracy, LCD display, and SPC data output.

Key Features

Non-rotating spindle design eliminates torsion on workpieces, preventing deformation and marking on delicate materials [1.1.9]
Narrow Type A blade profile (0.75 mm thickness) allows precise measurement of keyways, grooves, and hard-to-reach recesses
ABSOLUTE (ABS) linear encoder technology stores origin point settings and eliminates overspeed errors
Integrated SPC data output functionality facilitates real-time data transfer to metrology software
Ratchet stop mechanism provides a constant measuring force of 3 to 8 N for highly repeatable measurements
Satin chrome-finished sleeve and laser-etched thimble paired with a high-contrast 7.5 mm height LCD display

Technical Specification Matrix

Parameter	Value
Measuring Range	0 - 25 mm
Resolution	0.001 mm
Accuracy	±3 µm
Parallelism	3 µm
Blade Type	Type A (hardened steel)
Blade Thickness	0.75 mm
Blade Depth (b)	11.0 mm
Spindle Type	Non-rotating
Display Type	LCD (7.5 mm character height)
Measuring Force	3 - 8 N
Battery Type	SR44 (1 pc., No. 938882)
Battery Life	Approx. 2.4 years under normal use
Data Output	Yes (SPC compatibility)
IP Rating	IP54
Physical Weight (kg)	0.37
Dimensions L x W x H (cm)	23 x 2.9 x 3.7

Industrial Applications

1. Automotive Transmission Shaft Keyway Inspection

Quality control of precision-machined automotive transmission shafts requires verifying keyway groove depths. The 0.75 mm thin Type A blade easily slips into tight grooves, while the non-rotating spindle prevents damage to the newly machined keyway walls.

Problem Solved

Standard flat-faced micrometers cannot fit inside keyway grooves to measure root diameter, whereas standard rotating-spindle micrometers can twist and score precision-ground surfaces. The non-rotating blade design resolves both issues.

keyway measurementnon-rotating spindleType A bladegroove diameter

2. Robotic Gearbox Shaft Circlip Groove Verification

In robotic joint gearboxes, retaining ring (circlip) grooves must meet exact width and depth tolerances to prevent failure. This micrometer with ±3 µm accuracy and 0.001 mm resolution provides precise dimensional confirmation of the groove root diameter.

Problem Solved

Unintended variances in circlip groove depth can lead to snap rings popping out under high axial load. The high-resolution measurement ensures tight tolerance limits are verified before gearbox assembly.

circlip groovegroove root diameterhigh-resolution measurementrepeatable accuracy

3. Aerospace Micro-Turbine Spline Measurement

Measuring the minor diameter of external splines on small aerospace engine components requires a fine contact tip. The 0.75 mm blade can seat correctly between narrow splines to take high-accuracy measurements, with results logged instantly via SPC output.

Problem Solved

Standard micrometers are too bulky to fit between the teeth of fine splines. Manual tracking of measurements is slow and prone to transcription errors, which is completely bypassed using SPC digital integration.

spline diameternarrow spacingSPC data outputabsolute encoder