• Wide range of inside measurements possible by combining extension rods and anvils with the micrometer head.
  • Two types of measuring faces are available; with or without carbide tip. (No. 337- 101/301/302/102/303/304 only available with carbide )
  • The sleeve is rotated to adjust the index line position when setting to a length standard.

Extension Rod Tubular Inside Micrometers

  • An inside length standard is required for accurately setting the
  • Order No. 337-101/301/302/102/303/304 features:
  • IP65 (water-proof) protection level that enables use in the presence of cutting
  • A large-character LCD
  • Storage of 2 preset values for use when setting to an inside length
  • A function lock that prevents accidental changing of the reference setting during
  • An output port for measurement data that enables inclusion in a statistical process control or networked measurement Refer to page A-3 for details.
  • Ability to use Interface Input Tools that enable conversion of measurement data to keyboard signals that are then directly input to cells in off-the-shelf spreadsheet software such as Excel. Refer to page A-5 for details.

Extension Rod Tubular Inside Micrometers



Order No. Range Resolution Micrometer head stroke Extension rods Display unit
Qty Size
Digimatic (LCD)
337-101 200 – 225mm 0.001mm 25mm 200 – 225mm
337-301 200 – 1000mm 6 25,50,100 (2pcs),200,300mm
337-302 200 – 1500mm 7 25, 50, 100, 200, 300 (3pcs) mm


Order No. Range Resolution Micrometer head stroke Extension rods Display unit
Qty Size (inch)
Digimatic (LCD)
337-102 8” – 9” .0001″/ 0.001mm 1” 8 – 9″
337-303 8” – 40” 6 1”, 2”, 4” (2 pcs.), 8”, 12”
337-304 8” – 60” 7 1”, 2”, 4”, 8”, 12” (3 pcs.)


Extension Rod Tubular Inside Micrometers

IP Codes
Level 6: Dust-proof.

No ingress of dust allowed. Level 5: Protected against water jets.
Water projected in jets against the enclosure from any direction shall have no harmful effects.

Technical DataExtension Rod Tubular Inside Micrometers
Accuracy ±(3 + number of rods + maximum measurement length/50) µm (fraction rounded up)

Excluding quantizing error (only for Digimatic)


(for 337-101/301/302/102/303/304)

Zero-setting Origin restoration Data hold

2-point Preset Function lock

Automatic power ON/OFF Error alarm

Data output

Battery and scale type

(for 337-101/301/302/102/303/304)

SR44 (1 pc), 938882, for initial operational checks (standard accessory)

Battery life: Approx. 1.2 years under normal use Scale type: Electromagnetic induction-type rotary encoder

Optional accessories
Refer to page A-21 for details. Connecting cables with IT/DP/MUX, etc.

1m: 05CZA662
2m: 05CZA663

USB Input Tool Direct (2m): 06ADV380B
Connecting cables  for U-WAVE-T For standard (160mm): 02AZD790B
For foot switch: 02AZE140B