Mitutoyo - Spline Micrometers - Series 331


IP65 water/dust protection (Series 331)
The anvil and spindle have a small diameter for measuring splined shafts, slots, and keyways.
With Ratchet Stop for constant force.
With SPC output (Series 331)
With a standard bar except 0‐25mm and 0‐1" model.
Supplied in fitted plastic case.


Origin‐set, Zero‐setting,Data hold, Data output, inch/mm conversion (inch/mm models)
Alarm: Low voltage, Counting value composition error

SKU Description Range Inch/Metric Accuracy Mass Type Each
331-351-30 0-1in / 0-25.4mm Spline MicrometersDigital 0-1in/0-25.4mmInch/Metric±.0001330gA
331-352-30 1-2in / 25.4-50.8mm Spline MicrometersDigital 1-2in/25.4-50.8mmInch/Metric±.0001470gA
331-353-30 2-3in / 50.8-76.2mmSpline MicrometersDigital 2-3in/50.8-76.2mmInch/Metric±.0001625gA
331-354-30 3-4in / 76.2-101.6mm Spline MicrometersDigital 3-4in/76.2-101.6mmInch/Metric±.00015565gA
331-361-30 0-1in / 0-25.4mm Spline MicrometersDigital 0-1in/0-25.4mmInch/Metric±.0001330gB
331-362-30 1-2in / 25.4-50.8mm Spline MicrometersDigital 1-2in/25.4-50.8mmInch/Metric±.0001470gB
331-363-30 2-3in / 50.8-76.2mm Spline MicrometersDigital 2-3in/50.8-76.2mmInch/Metric±.0001625gB
331-364-30 3-4in / 76.2-101.6mm Spline MicrometersDigital 3-4in/76.2-101.6mmInch/Metric±.00015565gB
331-251-30 0-25mm Spline MicrometersDigital 0-25mmMetric±2µm330gA
331-252-30 25-50mm Spline MicrometersDigital 25-50mmMetric±2µm470gA
331-253-30 50-75mm Spline MicrometersDigital 50-75mmMetric±2µm625gA
331-254-30 75-100mm Spline MicrometersDigital 75-100mmMetric±3µm565gA
331-261-30 0-25mm Spline MicrometersDigital 0-25mmMetric±2µm330gB
331-262-30 25-50mm Spline MicrometersDigital 25-50mmMetric±2µm470gB
331-263-30 50-75mm Spline MicrometersDigital 50-75mmMetric±2µm625gB
331-264-30 75-100mm Spline MicrometersDigital 75-100mmMetric±3µm565gB
Set Descending Direction
per page

Additional Info

Technical Data:

Resolution*: 0.001mm or .00005"/0.001mm
Graduation**:0.01mm, .001" or .0001"
Flatness: 0.3im/.000012"
Parallelism: (2+R/100)im, R=max.range (mm)
[.00008"+.00004" (L/4")]
L=max. range (inch)
Measuring faces: Carbide tipped.
Display*: LCD
Battery*: SR44 (1pc) 938882
Battery life*: Approx. 1.2 years under normal use
Dust/water protection level*: IP65
*Digital models**Analog models

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