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Sanfeng 331-251 Digital Spline Micrometer
Spline micrometer（331Series)
characteristic:
- Meets IP65 dust/water protection standard (331 series)
- The anvil and spindle both come with a small diameter measuring head, which can be used to measure spline shafts, grooves, and keyway grooves
- The measuring surface has a hard alloy head
- The ratchet locking device can maintain a constant force measurement
- Equipped with a reference pole (excluding 25mm type)
- 331 series with SPC data output
Measurement surface:
- Flatness: 0.3um (0.00012 ″)
- Parallelism: （2＋L/100）um[（.00008＋.00004（L/4））″]
Imperial/metric systemDigital display type
Metric typeDigital display type
| measuring range | Item number | number | Resolution | accuracy | remarks |
| 0-25mm | 331-251 | SPM-25MJ | 0.001mm | ±2um | Type A |
| 0-25mm | 331-261 | SPM2-25MJ | 0.001mm | ±2um | Type B |
| 25-50mm | 331-252 | SPM-50MJ | 0.001mm | ±2um | Type A |
| 25-50mm | 331-262 | SPM2-50MJ | 0.001mm | ±2um | Type B |
| 50-75mm | 331-253 | SPM-75MJ | 0.001mm | ±2um | Type A |
| 50-75mm | 331-263 | SPM2-75MJ | 0.001mm | ±2um | Type B |
| 75-100mm | 331-254 | SPM-100MJ | 0.001mm | ±3um | Type A |
| 75-100mm | 331-264 | SPM2-100MJ | 0.001mm | ±3um | Type B |
Note: Type A anvil/mandrel size 3mm, Type B anvil/mandrel size 2mm
| measuring range | Item number | number | Resolution | accuracy | remarks |
| 0-1" | 331-351 | SPM-1"MJ | .00005" | ±.0001" | Type A |
| 0-1" | 331-361 | SPM2-1"MJ | 0.001mm | ±.0001" | Type B |
| 1"-2" | 331-352 | SPM-2"MJ | .00005" | ±.0001" | Type A |
| 1"-2" | 331-362 | SPM2-2"MJ | 0.001mm | ±.0001" | Type B |
| 2"-3" | 331-353 | SPM-3"MJ | .00005" | ±.0001" | Type A |
| 2"-3" | 331-363 | SPM2-3"MJ | 0.001mm | ±.0001" | Type B |
| 3"-4" | 331-354 | SPM-4"MJ | .00005" | ±.0001" | Type A |
| 3"-4" | 331-364 | SPM2-4"MJ | 0.001mm | ±.0001" | Type B |
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