Mitutoyo CHM-20MX Digimatic Crimp Height Micrometer

USD 357.96

IP65-rated digimatic micrometer with a 0-20mm range, ±3µm accuracy, and pointed spindle to verify electrical contact terminal crimping height.

SKU Mitutoyo-342-271-30 Category
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Mitutoyo CHM-20MX Digimatic Crimp Height Micrometer

Model Identifier CHM-20MX
Official Part Number 342-271-30
GTIN Standard 4946368689166

Technical Overview

IP65-rated digimatic micrometer with a 0-20mm range, ±3µm accuracy, and pointed spindle to verify electrical contact terminal crimping height.

Key Features

  • IP65 water and dust protection level permits reliable use in harsh manufacturing environments exposed to cutting oil or coolants.
  • Specialized pointed spindle and flat blade anvil geometry enables exact positioning to measure electrical terminal crimp height.
  • Integrated Ratchet Stop mechanism ensures constant measuring force for highly repeatable, user-independent measurement values.
  • Integrated Digimatic SPC data output enables swift statistical process control and automated record-keeping.
  • Large, high-contrast LCD screen with easy-to-read character layout showing instant millimeter readings with 0.001 mm resolution.
  • Multi-functional system includes Origin-set, Zero/ABS setting, Data hold, and Function lock to prevent accidental calibration changes.

Powered by a single SR44 silver oxide battery (Part No. 938882) with approximately 2.4 years of battery life under normal use.

Technical Specification Matrix

ParameterValue
Measuring Range0 - 20 mm
Resolution0.001 mm
Accuracy±3 µm
Ingress Protection RatingIP65
Anvil TypeBlade
Spindle TypePointed (30-degree)
Measuring Force3 to 10 N (Ratchet Stop)
BatterySR44 (1 pc., 938882)
Battery LifeApprox. 2.4 years
Sensor TypeElectromagnetic induction rotary encoder
Data OutputYes (Digimatic SPC output)
Physical Weight (kg)0.27
Dimensions L x W x H (cm)15.8 x 6.1 x 2.6

Industrial Applications

1. Automotive Wiring Harness Quality Control

Verifying the physical compression height of wire terminal connections in automotive wiring harnesses to prevent high resistance or loose connections.

Problem Solved

Standard flat micrometers cannot seat correctly between terminal crimp ears. The CHM-20MX's blade anvil and pointed spindle accurately isolate the crimped area, and the ±3 µm accuracy verifies correct compression without damaging the surrounding metal.

Crimp HeightWiring Harness±3 µm AccuracyAutomotive Electronics

2. High-Volume Connector Manufacturing Line Testing

Performing automated or manual SPC inspection on high-speed contact crimping machines directly on the manufacturing shop floor.

Problem Solved

Tooling wear causes the crimp process to drift. The IP65 design allows inspectors to operate the micrometer near coolant-heavy tooling machines, and the SPC data output facilitates instant transfer to automated tracking software to detect calibration drift early.

SPC Data OutputIP65 ProtectionTool DriftStatistical Process Control

3. Aerospace Cable Assembly Integrity Verification

Validating critical aviation electrical connections where compliance with strict structural and electrical contact standards is required.

Problem Solved

Visual inspect-gauges do not provide exact dimensional depth. This micrometer delivers numeric proof down to 0.001 mm. The built-in function lock prevents operators from accidentally changing origin parameters during batch tests, maintaining calibration safety.

0.001 mm ResolutionFunction LockAerospace AssemblyContact Validation
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