Mitutoyo 389-251-30 Sheet Metal Micrometer

USD 399.75

IP65 digital micrometer with 160mm throat, 0-25mm range, 0.001mm resolution, and ±4µm accuracy. Perfect for high-accuracy sheet material thickness inspection.

SKU Mitutoyo-389-251-30 Category
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Mitutoyo 389-251-30 Sheet Metal Micrometer

Model Identifier 389-251-30
Official Part Number 389-251-30
GTIN Standard 4946368689180

Technical Overview

IP65 digital micrometer with 160mm throat, 0-25mm range, 0.001mm resolution, and ±4µm accuracy. Perfect for high-accuracy sheet material thickness inspection.

Key Features

  • Deep frame design with 160 mm throat depth for measuring thickness of sheets at deep locations [1.1.4].
  • IP65 dust and water protection allows use in environments exposed to cutting oil or coolants.
  • Equipped with constant-force ratchet stop mechanism (3-8 N) for repeatable measurements.
  • Carbide-tipped measuring faces provide exceptional wear resistance and durability.
  • Absolute (ABS) electromagnetic rotary sensor prevents overspeed errors and preserves origin setting.
  • Supports SPC Digimatic data output for streamlined digital metrology data management.

1 x SR44 Silver Oxide Button Cell Battery (approx. 2.4 years battery life under normal use)

Technical Specification Matrix

ParameterValue
Measuring Range0 - 25 mm
Resolution0.001 mm
Accuracy±4 µm
Throat Depth160 mm
Anvil/Spindle ConnectionFlat-Flat (Type A)
IP RatingIP65
Measuring Force3 - 8 N
Flatness of Measuring Faces0.6 µm
Parallelism of Measuring Faces3 µm
Battery Type1x SR44 (Silver Oxide Button Cell)
Battery LifeApprox. 2.4 years under normal use
Spindle Pitch0.5 mm
Spindle Diameter6.35 mm
Thimble & Sleeve FinishSatin Chrome
Physical Weight (kg)0.84
Dimensions L x W x H (cm)28 x 18 x 3.5

Industrial Applications

1. Quality Assurance in Precision Metal Stamping

In metal stamping operations, checking the consistency of sheet metal blanks at various points from the edges is critical to prevent forming defects. The deep 160mm throat depth of the micrometer allows inspectors to verify the thickness of large metal sheets deep into the center, rather than just at the perimeter.

Problem Solved

Avoids measurement limitation of standard shallow outside micrometers that can only reach 25-50mm from the sheet edge.

Sheet Metal StampingThickness MeasurementThroat DepthCarbide-Tipped Faces

2. Production Inspection in Automotive Press Shops

In automotive stamping lines, components are continuously coated in lubricants and drawing compounds. The IP65 rating of the 389-251-30 ensures that exposure to oil mist, coolant splashes, and particulate matter does not damage the sensitive digital electronics or cause inaccurate readings.

Problem Solved

Prevents sensor ingress failure and electronic measurement drifting in environments high in lubricants and fluids.

Automotive Press ShopIP65 ProtectionCoolant-ProofSPC Data Output

3. Thickness Control in Extruded Plastic and Rubber Sheet Manufacturing

Continuous plastic extrusion lines require periodic manual thickness auditing of wide sheets. Using a digital micrometer with a flat-flat anvil configuration and constant-force ratchet stop (3-8 N) allows the operator to perform high-precision thickness measurements (down to 1 µm resolution) without compressing or deforming soft plastic or rubber materials.

Problem Solved

Eliminates user-induced measurement variation on soft materials by maintaining a highly stable, low constant measuring force.

Plastic ExtrusionConstant Force RatchetResolution 0.001mmRubber Sheet Inspection
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