Name: Mitutoyo 511-921-20 Dial Bore Gage Set - INOSAKI
SKU: Mitutoyo-511-921-20
Price: 560.00 USD
Availability: InStock

Technical Overview

Precision metric dial bore gage set with 18-150mm range, 0.01mm resolution, and ±2µm accuracy for internal diameter measurement.

Key Features

Mechanical measurement technology.
Carbide-tipped contact points ensure high durability and wear resistance.
Measures in metric units.
Includes interchangeable anvils and spacers for a wide measurement range.
Features large, newly designed grips to reduce heat transfer from the operator.
The included dial indicator is fully protected by a rugged cover.
Gage stem diameter is 8mm.
Automatically self-centres via a centring bridge.
Two-point contact system effectively detects geometry anomalies like roundness and taper.
Optional extension rods are available for measuring deep holes.
Supplied in a fitted plastic case for protection and organization.

Technical Specification Matrix

Parameter	Value
Technology	Mechanical
Contact Point Material	Carbide Tipped
Units	Metric
Accuracy	± 2µm (0.002mm)
Repeatability	0.5µm (0.0005mm)
Adjacent Error	1µm
Stem Diameter	8mm
Measuring Range	18-150mm
Graduation	0.01mm
Number of Anvils	26 (with 50mm Sub Anvil)
Number of Spacers	10
Measuring Depth	100/150mm
Included Dial Indicator Model	2046AB / 2046SB
Dial Gage Protective Cover	Yes (21DZA000)
Stroke of Contact Point	1.2 mm (for 18-60mm range) / 1.6 mm (for 50-400mm range, general bore gage spec)
Type	Standard Type Dial Bore Gage
Physical Weight (kg)	0
Dimensions L x W x H (cm)	0 x 0 x 0

Industrial Applications

1. High-Precision Engine Cylinder Inspection

The Mitutoyo 511-921-20 is ideal for critical internal diameter measurement of engine cylinders during manufacturing or rebuilds. Its 18-150mm range and ±2µm accuracy ensure precise validation of bore dimensions.

Problem Solved

Prevents engine performance degradation, excessive oil consumption, and premature wear by ensuring cylinder bores meet tight manufacturing tolerances for optimal piston and ring fit.

Bore diameter measurementEngine cylinder quality controlConcentricity checkTaper measurementPrecision machining validation

2. Hydraulic/Pneumatic Valve Body Quality Control

This bore gage can be used to verify the exact internal diameters within hydraulic or pneumatic valve bodies, where precise dimensions are essential for proper sealing and fluid flow control. The 0.5µm repeatability is crucial for consistency.

Problem Solved

Ensures reliable operation and prevents leaks, pressure loss, or functional failures in fluid power systems caused by incorrectly sized internal passages or sealing surfaces.

Valve bore measurementFluid power componentsSealing surface inspectionFlow control validationHydraulic manifold assessment

3. Bearing Housing Manufacturing Tolerance Verification

Utilizing its 18-150mm range and high accuracy, the Mitutoyo 511-921-20 is perfectly suited for confirming the precise internal diameter specifications of bearing housings during their production.

Problem Solved

Mitigates risks of premature bearing failure, excessive friction, vibration, or reduced operational life resulting from an improper fit between the bearing and its housing.

Bearing housing diameterFit and tolerance analysisRotational component inspectionMechanical assembly precisionInner diameter validation