Description
Condition
New old stock (Gauge Body Set / Indicator Not Included).
This bore gauge as new, unused item supplied in its original manufacturer packaging. It comes complete with the gauge stem, the full set of 9 interchangeable anvils (10mm–18.5mm), the spacer, and the adjustment tools. Please Note: This is the “Body Only” kit (Model 511-201) and is supplied without a dial indicator. This allows you to fit your preferred indicator—whether it’s a standard analogue model (like the 2046S) or a high-resolution digital model (like the 543 series)—depending on your specific tolerance requirements.
Need a Dial Indicator?
We stock a wide range of compatible Mitutoyo Dial and Digital Indicators. [Browse our Indicator Section here] to complete your bore gauge set with the perfect display for your needs.
Product Overview
The Mitutoyo 511-201 is a specialized “Small Hole” Bore Gauge designed for high-precision internal measurement in the delicate 10mm to 18.5mm range. Unlike standard bore gauges that start at 18mm or 35mm, this model features a miniature measurement head specifically engineered to enter tight bores while maintaining the rigidity required for accurate inspection.
The gauge features a self-centring bridge mechanism that automatically aligns the contact points across the true diameter of the bore, eliminating alignment errors. The interchangeable anvil system allows you to cover the entire 8.5mm span with just one tool. It is equipped with carbide-tipped contact points, ensuring high durability and wear resistance even when measuring abrasive materials like cast iron cylinder liners or valve guides.
Brand Information
Mitutoyo Corporation (est. 1934) is the global standard for dimensional metrology. Their Series 511 Bore Gauges are the most trusted instruments for internal diameter measurement in the world. By offering the 511-201 as a “component” set, Mitutoyo allows professional machinists to customize the resolution of the tool—pairing it with a 0.01mm dial for general work or a 0.001mm digital indicator for aerospace-grade tolerances.
Specifications
| Feature | Specification |
| Model | 511-201 (CG-18A) |
| Measuring Range | 10mm – 18.5mm |
| Measuring Depth | 100mm |
| Anvils Included | 9 pcs (10mm to 18mm steps) |
| Spacers | 1 pc (0.5mm) |
| Contact Points | Carbide Tipped |
| Accuracy | 5µm (Wide Range) / 2µm (Repeatability) |
| Stem Diameter | 8mm (Standard Mount) |
| Included | Body, Anvils, Spanner, Case (No Indicator) |
Keywords
Mitutoyo, 511-201, small bore gauge, 10-18mm gauge, cylinder gauge, ID measurement, valve guide gauge, blind hole gauge, CG-18A, machinist tools.
