Accud
Accud Dial Bore Gauge — 50–160mm
Part No: AC-251-160-11 | Barcode: 9346967024842 | Series: Accud 251 Dial Bore Gauges
The Accud AC-251-160-11 is a 50–160mm dial bore gauge for fast, accurate inside-diameter inspection of cylinder bores, bearing housings and machined bores. The self-centring contact system pivots against the bore wall and reads the diameter differential on a 0.01mm dial — the workshop standard for engine rebuild and precision bore work.
50–160mm Range
0.01mm Graduation
Self-Centring Contacts
Carbide Contact Tips
Setting Ring Calibration
Compatible Work
Cylinder Bores
Bearing Housings
Hydraulic Bores
Machined Bores
Engine Rebuild
Key Features & Benefits
- Self-centring contact system — three-point contact automatically locates true bore centre; no operator-dependent rocking or fishing for the max diameter.
- Carbide contact tips — resist wear from repeated measurement in cast-iron and hardened bore walls.
- 0.01mm dial graduation — clear dial reads differential from a zeroed setting ring; ideal for taper and out-of-round checks.
- Interchangeable anvil rods — six or more anvil sizes cover the full 50–160mm range; swap for the target bore nominal.
- Setting ring calibration — zero the gauge against a known reference ring before measurement; catches wear or thermal drift before it affects readings.
- Essential for engine rebuild — the standard tool for checking cylinder taper, out-of-round, and wear beyond service limits.
When to Use the AC-251-160-11
Reach for the AC-251 when you need to inspect a cylinder bore or bearing housing for roundness, taper or wear — engine rebuild, hydraulic cylinder recondition, or precision machined-bore QC. Pair it with an outside micrometer: set the mic to the nominal bore, use it to zero the bore gauge setting ring, then the bore gauge reads deviations directly. For bores below 50mm, step down to a telescopic gauge set (AC-951); for larger, the AC-352 inside micrometer.
Pro Tip: Always zero the bore gauge at the same temperature as the work — a 10°C difference between setting ring and workpiece can shift the reading by 0.01mm per 100mm of bore. Let tool and part sit together for ten minutes before measurement on precision work; the handful of minutes saves scrapping a re-bored cylinder for being “0.02mm out” that was really thermal error.
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