Accud
Accud Mechanical Outside Micrometer — 0-25mm
Part No: AC-321-001-01 | Barcode: 9346967024965 | Series: Accud 321 Outside Micrometers
The Accud AC-321-001-01 is a mechanical outside micrometer covering 0-25mm at 0.01mm graduation with ±4µm accuracy. Tungsten-carbide measuring faces, ratchet stop and setting standard supplied — the bench workhorse for precision outside measurement that never runs out of battery.
0-25mm Range
0.01mm Graduation
±4µm Accuracy
Carbide Faces
Ratchet Stop
Setting Standard Included
Compatible Work
Steel & Alloys
Hardened Steel
Aluminium
Non-Ferrous
Precision Turning
Key Features & Benefits
- 0.01mm thimble graduation — clear graduations on the thimble for reading to 10µm; standard workshop precision for fit and tolerance work.
- Tungsten-carbide measuring faces — stand up to repeated contact on hardened steel without wearing the faces out of flatness.
- Ratchet stop — applies consistent measuring pressure at the spindle so readings don’t vary with operator grip.
- Setting standard included — verify zero against the supplied standard before critical readings; catches frame wear or bump damage.
- Battery-free mechanical scale — no electronics to fail; a well-maintained micrometer reads accurately for decades.
- Locking clamp — lock the spindle at a dimension for transfer to another caliper or part, or for teaching apprentices to read a mic.
When to Use the AC-321-001-01
Reach for the AC-321-001-01 mechanical mic for everyday outside measurement in the 0-25mm range — shaft diameters, turned parts, stock thicknesses. For coolant environments or when sub-micron resolution matters, step up to the IP65 digital AC-313. For quick comparative checks without fine resolution, a caliper is faster but not as accurate.
Pro Tip: Use the ratchet stop every time, even for a quick read — hand pressure through the thimble varies by operator and grip, and the difference can be 0.01–0.02mm on a small part. The ratchet standardises pressure and makes your readings repeatable across the day.
Product Specifications
| Part No. | Type | Range | Resolution | Accuracy | Barcode |
|---|---|---|---|---|---|
| AC-313-001-02 | Digital IP65 | 0-25mm | 0.001mm | ±2µm | 9346967028970 |
| AC-321-001-01 ★ | Mechanical Outside | 0-25mm | 0.01mm | ±4µm | 9346967024965 |
| AC-321-002-01 | Mechanical Outside | 25-50mm | 0.01mm | ±4µm | 9346967024972 |
| AC-321-003-01 | Mechanical Outside | 50-75mm | 0.01mm | ±4µm | 9346967024989 |
| AC-321-003-03 | Mechanical Outside Set | 0-75mm (3pc) | 0.01mm | ±4µm | 9346967024996 |
| AC-352-024-01 | Tubular Inside Set | 50-600mm | 0.01mm | (3+n+L/50)µm | 9346967024934 |
| AC-391-006-01 | Depth | 0-150mm | 0.01mm | ±3µm | 9346967024958 |
★ You are viewing the highlighted variant. Other sizes in this series are also available.
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