Mitutoyo 511-201 Small Hole Bore Gauge, Range 10-18.5mm (Without Dial Gauge)
The Mitutoyo 511-201 is a small hole bore gauge covering the 10–18.5 mm range, designed for precise internal diameter measurement of bores, holes, and grooves that are too small for a standard bore gauge or inside micrometer. Supplied without a dial gauge (sold separately), this gives you the flexibility to pair it with your preferred indicator — whether a Mitutoyo 2046A or any dial indicator with an 8 mm stem.
The 511 series uses a self-centring split-anvil design with 9 interchangeable carbide-tipped anvils and 1 spacer to cover the full 10–18.5 mm range in precise increments. Simply select the correct anvil for your bore size, insert the gauge, and read the measurement directly from the dial indicator. It's the fast, reliable way to check bore diameters, bushing IDs, and reamed holes to micrometre accuracy on the shop floor.
✦ Key Features
10–18.5 mm Measuring Range — Covers a wide band of small bore sizes with a single gauge body, eliminating the need for multiple dedicated gauges.
9 Carbide-Tipped Anvils + 1 Spacer — Interchangeable anvils let you set the gauge precisely for each bore diameter. Carbide tips resist wear from repeated contact with hardened bore surfaces.
Self-Centring Split-Anvil Design — The anvils automatically centre in the bore, ensuring you capture the true diameter (not a chord) on every measurement.
8 mm Stem — Accepts Standard Indicators — Supplied without a dial gauge so you can mount your preferred indicator. Compatible with the Mitutoyo 2046A, 2046S, or any indicator with a standard 8 mm stem.
Compact & Lightweight — Designed for single-hand operation in production environments where speed and repeatability matter.
📐 Technical Specifications
| Model | 511-201 |
| Range | 10–18.5 mm |
| Anvils | 9 (carbide-tipped) |
| Spacers | 1 |
| Stem Diameter | 8 mm |
| Dial Gauge | Not included (sold separately) |
| Recommended Indicator | Mitutoyo 2046A (10 mm range, 0.01 mm graduation) |
| Origin | Mitutoyo (Japan) |
🏭 Applications
Bore & Hole Measurement — Check drilled, reamed, and bored holes in the 10–18.5 mm range for diameter accuracy and roundness.
Bushing & Bearing ID Inspection — Verify internal diameters of bushings, bearings, and press-fit bores during incoming inspection and assembly.
Hydraulic & Pneumatic Cylinders — Measure cylinder bore diameters for fit and clearance during manufacture and overhaul.
Tool & Die Making — Check die bores, ejector pin holes, and guide pin bores to drawing tolerances.
Production Line QC — Fast, repeatable bore checking on the production floor — the self-centring design requires minimal skill to get accurate readings.
Why Buy from San Tools?
✅ Authorised Mitutoyo Distributor — Genuine product with full manufacturer warranty.
✅ In Stock in Dubai — Ships same-day from our Al Quoz warehouse.
✅ Matching Dial Indicators Available — Pair with the Mitutoyo 2046A dial indicator for a complete bore gauging setup.
✅ Free UAE Delivery — On orders over AED 500.
✅ Expert Support — 38 years matching the right measuring solution to the right application.
Frequently Asked Questions
Does this bore gauge come with a dial indicator?
No. The 511-201 is sold without a dial gauge, giving you the flexibility to pair it with your preferred indicator. We recommend the Mitutoyo 2046A (sold separately on this store).
How do I set the gauge to my bore size?
Select the anvil that brings the gauge closest to your target bore diameter. Set the indicator to zero against a ring gauge or micrometer at the nominal size, then insert the bore gauge into the workpiece to read deviation directly.
Can I use a digital indicator instead of an analog dial?
Yes. Any indicator with a standard 8 mm stem will fit — including Mitutoyo digital indicators like the 543 series.
What bore sizes does the full 511 series cover?
The Mitutoyo 511 series covers bores from 6 mm up to 160 mm across multiple models. Contact us for other ranges.