Mitutoyo 511-714-20 Dial Bore Gauge, 100-160mm

Technical Overview

Precision 2-point dial bore gauge with 100-160mm range, 0.01mm resolution, and ±2µm accuracy. Features carbide-tipped contacts and a thermal-insulated grip.

Key Features

Self-centering 2-point inside measuring instrument via a pendulum centering bridge.
Wide measuring range of 100 mm to 160 mm with high accuracy of ±2 µm and repeatability of 0.5 µm.
Hollow-structured thermal-insulated grip reduces operator hand heat transfer by up to 50% for improved dimensional stability.
Equipped with highly durable carbide-tipped contact points and anvils for excellent abrasion resistance.
Expanded plunger stroke of 1.6 mm ensures reliable performance without compromising accuracy.
Supplied with 13 interchangeable anvils and 4 spacers (0.5 mm thick) to facilitate small-step fine-tuning.
Includes a rugged, analog Mitutoyo 2046AB dial indicator with clear 0.01 mm graduations.

Technical Specification Matrix

Parameter	Value
Measuring Range	100 - 160 mm
Graduation	0.01 mm
Accuracy	±2 µm
Repeatability	0.5 µm
Adjacent Error	1 µm
Stroke of Contact Point	1.6 mm
Measuring Depth	150 mm
Dial Indicator Model	2046AB
Number of Anvils	13
Number of Spacers	4 (0.5 mm thickness)
Measuring Force	5 N or less
Guide Force	10 N or less
Contact Point Material	Carbide
Physical Weight (kg)	0.48
Dimensions L x W x H (cm)	28.2 x 5 x 3

Industrial Applications

1. Automotive Cylinder Bore Inspection

Rebuilders and manufacturers of large automotive or marine engines use the bore gauge to measure engine block cylinder bores (typically around 100–160 mm) for wear, taper, and ovality.

Problem Solved

Prolonged holding of conventional steel bore gauges causes thermal expansion of the tool, leading to measurement drift. The 511-714-20's hollow-structured grip reduces thermal transfer by 50%, maintaining ±2 µm accuracy throughout consecutive cylinder inspections.

Cylinder BoreTaper MeasurementOvalityThermal IsolationEngine Rebuilding

2. Hydraulic Cylinder Manufacturing and Quality Control

High-pressure hydraulic cylinders require extremely tight internal diameter tolerances to prevent fluid bypass under pressure. Quality control engineers use this gauge to inspect honed cylinder bodies prior to piston assembly.

Problem Solved

Measuring deep bores up to 150 mm (expandable with rods) requires highly stable, repeatable centering. The pendulum guide structure and 0.5 µm repeatability of the 511-714-20 ensure concentric, uniform tolerance checks along the entire stroke of the hydraulic bore.

Hydraulic CylindersBore HoningInternal Diameter TolerancesPendulum Centering BridgeRepeatability

3. Heavy Machinery Bearing Housing Validation

Heavy industrial gearboxes and rotating machinery rely on press-fit bearings mounted in housing bores between 100 mm and 160 mm. Machinists use this gauge to verify the bore diameter is within specified limits before press-fitting.

Problem Solved

Standard steel contacts wear down quickly when measuring abrasive cast iron or hard steel housings, altering the baseline calibration. The carbide-tipped measuring faces of this gauge resist wear, ensuring long-term measurement consistency and preventing loose-fit bearing failures.

Bearing HousingPress-Fit TolerancesCarbide Contact PointsWear ResistanceMetrology Validation