Mitutoyo 122-101-10 Blade Micrometer

Technical Overview

Analogue blade micrometer with 0-25mm range, 0.01mm graduation, ±3µm accuracy, and 0.75mm Type A hardened steel blade for narrow groove measurements.

Key Features

Blade-shaped anvil and spindle designed for measuring groove diameters of shafts, keyways, and other hard-to-reach features
Non-rotating spindle design prevents workpiece damage and torque-induced misalignment
Equipped with a Ratchet Stop for constant measuring force (3 to 8 N)
Satin chrome finish on the thimble and sleeve for glare-free readability
Hardened steel Type A blades with 0.75 mm thickness
Heat shield included as standard to minimize thermal expansion during manual handling
Supplied in a protective fitted plastic storage case

Technical Specification Matrix

Parameter	Value
Measuring Range	0 - 25 mm
Graduation	0.01 mm
Accuracy	±3 µm
Parallelism	3 µm
Measuring Force	3 - 8 N
Blade Type	Type A (Hardened Steel)
Blade Thickness	0.75 mm
Spindle Type	Non-Rotating Spindle
Spindle Pitch	0.5 mm
Thimble Diameter	18 mm
Scale Finish	Satin chrome finish
Standard Accessories	Spanner (301336)
Physical Weight (kg)	0.26
Dimensions L x W x H (cm)	13.8 x 5 x 1.8

Industrial Applications

1. Rotary Shaft Retaining Ring Groove Inspection

In electric motor and gearbox assembly, shafts feature narrow machined grooves for circlips or retaining rings. The 0.75 mm Type A blade of the 122-101-10 is thin enough to fit directly into retaining ring grooves as narrow as 1.0 mm, allowing quality control teams to verify the critical root diameter within a 0-25 mm range.

Problem Solved

Standard flat-anvil micrometers cannot physically fit into narrow shaft grooves, while vernier calipers lack the high sub-micron accuracy (±3 µm) and parallelism required to guarantee a uniform groove bottom.

groove diametershaft inspectionretaining ringType A bladeroot diameter

2. Machined Keyway Depth and Bottom Profile Quality Control

During the machining of keyways on drive shafts for coupling torque transmission, ensuring consistent slot depth and bottom thickness is crucial. The non-rotating spindle design of this micrometer prevents the blade anvil from twisting or gouging the keyway slot walls as the measurement is taken.

Problem Solved

Standard rotating spindles cause rotational friction that can mar precision-machined keyway sidewalls and introduce measurement errors due to axial twist or skew.

keyway slotnon-rotating spindledrive shaftsprecision alignmentdamage-free

3. Splined Shaft Pitch Diameter and Root Groove Inspection

In automotive drivetrain manufacturing, splined shafts transfer high torque. Standard micrometers cannot reach the root diameter of splined grooves due to interference with the teeth. The 122-101-10 blade micrometer bypasses the spline peaks, measuring the root diameter directly with a constant force of 3-8 N provided by the ratchet stop.

Problem Solved

Ensures consistent measurement force between different operators to eliminate variance in tight tooth gaps, verifying correct gear matching and preventing drivetrain failures.

splined shaftroot diameterpitch diameterratchet stopconstant force