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Dimensional Measuring Tools
Mitutoyo Series 103 Mechanical Outside Micrometer, 50 to 75 mm Range, 103-139-10
Mitutoyo

Mitutoyo Series 103 Mechanical Outside Micrometer, 50 to 75 mm Range, 103-139-10

Mfr. part no.
103-139-10
SKU
MT-103-139-10

Specifications

Series 103 Series
Product Type Mechanical Outside Micrometer
Measuring Range 50 to 75 mm
Graduation 0.01 mm
Accuracy ±2 µm
Compliance Standards EN ISO 3611
Measuring Face Carbide Tipped
Model OM-75

Key Features

  • Ratchet stop helps apply consistent measuring force.
  • Carbide-tipped measuring faces support regular industrial use.
  • Satin chrome sleeve and thimble provide clear manual reading.
  • Spindle lock helps hold the measured size during inspection.
  • Includes: Operating Instructions paperwork inside the box.
  • Made in Japan.

Description

Mitutoyo 103-139-10 / OM-75 is a Series 103 analogue outside micrometer for 50 to 75 mm outside measurement with 0.01 mm graduation. It uses carbide-tipped micro-lap measuring faces, a spindle lock, satin chrome thimble and sleeve, and a ratchet stop for repeatable measuring force during shaft, sleeve, spacer, thickness and machined part checks. The micrometer is supplied with box, key and setting standard, making it suitable for workshop inspection, maintenance stores, machining QC and tool room measurement.

Applications

  • Outside diameter checks on shafts, pins and turned parts.
  • Thickness measurement of washers, plates and machined components.
  • Tool room, inspection bench and mechanical maintenance use.

Documents

  • Mitutoyo-103-139-10 — Datasheet

    PDF, 606 KB

  • Mitutoyo-103 Series Outside Micrometers — Catalog

    PDF, 160 KB

Cross-reference

The closest equivalents from other brands, with the differences stated so you can check before you order.

Insize 3203-75A

Insize Series 3203 Outside Micrometer, 50–75 mm, 0.01 mm graduation

The Insize 3203-75A is an analogue outside micrometer for the 50–75 mm range with 0.01 mm graduation, featuring carbide-tipped measuring faces, a spindle lock, and a ratchet thimble for consistent measuring force. It has a satin chrome finish and is supplied with a setting standard and storage case. Widely distributed in the GCC and accepted in maintenance and workshop inspection roles.

Specifications of the Insize part

Measurement Range
50–75 mm
Graduation
0.01 mm
Measuring Faces
Carbide-tipped
Force Control
Ratchet thimble
Spindle Lock
Yes
Finish
Satin chrome
Includes
Setting standard, case

Starrett 436.1MXRL-75

Starrett 436 Series Outside Micrometer, 50–75 mm, 0.01 mm graduation

The Starrett 436 series is a precision analogue outside micrometer covering the 50–75 mm range with 0.01 mm graduation. It features hardened and ground carbide-tipped measuring faces, a satin chrome finish sleeve and thimble, and a ratchet thimble for consistent measuring force. Supplied with a setting standard and storage case, it is a direct workshop-grade substitute for the Mitutoyo 103-139-10.

Specifications of the Starrett part

Measurement Range
50–75 mm
Graduation
0.01 mm
Measuring Faces
Carbide-tipped
Thimble Finish
Satin chrome
Force Control
Ratchet stop
Includes
Setting standard, case

Tesa 00110103

Tesa Micromaster Outside Micrometer, 50–75 mm, 0.01 mm graduation

TESA 00110103 is an ISOMASTER analogue external micrometer, vernier model, 50–75 mm, reading to 0.01 mm. It is built to DIN 863 T1 / NF E 11-095 with tungsten carbide measuring inserts, a friction ratchet for repeatable measuring force, a locking screw on the spindle and a measuring force of up to 10 N. TESA publishes a maximum permissible error of 5 µm and a maximum permissible parallelism error of 3 µm at this size. ISOMASTER is TESA's analogue line; MICROMASTER is the separate digital line reading to 0.001 mm, and 00110103 does not belong to it. Two differences a buyer should note against the Mitutoyo 103-139-10 supplied here. First, the Mitutoyo is rated at ±2 µm maximum permissible error to EN ISO 3611 Class 1, a tighter figure than the 5 µm TESA publishes. Second, the Mitutoyo is supplied with box, spanner and a 50 mm setting standard, where TESA lists this micrometer with a measurement report and declaration of conformity.

Specifications of the Tesa part

Measurement Range
50–75 mm
Graduation
0.01 mm
Measuring Faces
Carbide-tipped
Force Control
Ratchet thimble
Spindle
Hardened, ground and lapped
Standard
ISO 3611

Mahr 4134002

Mahr Micromar 40 A Outside Micrometer, 50–75 mm, 0.01 mm graduation

The Mahr Micromar 40 A is a German-made analogue outside micrometer for the 50–75 mm range with 0.01 mm graduation. It features hardened carbide measuring faces, a friction thimble/ratchet for repeatable force, and a satin-finished sleeve and thimble. Widely accepted in metrology-grade workshop and QC environments as a like-for-like replacement for Mitutoyo Series 103 instruments.

Specifications of the Mahr part

Measurement Range
50–75 mm
Graduation
0.01 mm
Measuring Faces
Carbide-tipped
Force Control
Ratchet/friction thimble
Finish
Satin chrome
Standard
DIN 863

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