Mitutoyo 511-711-20 Dial Bore Gauge Set

Technical Overview

Mechanical instrument for inside diameter measurement. Offers 18-35mm range, 0.01mm graduation, 100mm probing depth, ±2µm accuracy, and 0.5µm repeatability.

Key Features

Extended plunger stroke of 1.2 mm for broader measurement range without affecting stated accuracy.
Ergonomic, hollow-structured grip reduces operator hand thermal transfer by 50% to minimize measurement drift.
Highly durable and abrasion-resistant carbide-tipped ball contact points on both the plunger and interchangeable anvils.
Fast, automatic self-centering via an integrated centering bridge for quick and reliable bore alignment.
Comprehensive analog inspection kit includes 9 anvils, 2 spacers, a dial protective cover, and a 2046AB dial indicator.

Technical Specification Matrix

Parameter	Value
Measuring Range	18 - 35 mm
Graduation	0.01 mm
Accuracy	±2 µm
Repeatability	0.5 µm
Adjacent Error	1 µm
Probe Depth	100 mm
Measuring Force	4 N or less
Guide Force	6 N or less
Stroke of Contact Point	1.2 mm
Stem Diameter	8 mm
Dial Indicator Model	2046AB
Dial Protection Cover Model	21DZA000
Contact Point Material	Carbide Tipped
Number of Anvils	9
Number of Spacers	2
Physical Weight (kg)	0.33
Dimensions L x W x H (cm)	28.2 x 5.7 x 3.5

Industrial Applications

1. Automotive Cylinder Bore Metrology

Inspecting internal cylinders in small combustion engines (such as motorcycle or small industrial motors) to verify wear patterns and ensure perfect sizing before installing pistons and rings.

Problem Solved

Uneven cylinder wear can result in cylinder ovality and taper, leading to oil blow-by and power loss. The 2-point contact design and ±2 µm accuracy allow machinists to quickly map the entire bore profile to identify geometric anomalies.

Cylinder OvalityEngine RebuildingTaper DetectionPiston Clearance

2. Precision Hydraulic Valve Sleeve Calibration

Checking inside diameter clearances of tight-tolerance hydraulic control valves and manifold sleeves to prevent high-pressure fluid bypass.

Problem Solved

Thermal expansion from handling can distort sub-micron clearances of small hydraulic sleeves during physical inspection. The hollow-structured grip reduces hand heat transfer by 50%, enabling stable, repeatable 0.5 µm measurements throughout deep-pocket sleeves.

Hydraulic ValvesSleeve Bore InspectionHollow-Structured GripFluid Bypass Prevention

3. Aerospace Bushing and Bearing Seat Verification

Qualifying the inside diameters of press-fit bushings and bearing housings in landing gear and flight control actuators.

Problem Solved

Abrasive aerospace alloys quickly degrade standard measurement tips, skewing measurements. The carbide-tipped ball contacts provide extreme wear resistance and continuous calibration accuracy for tight press-fit assemblies.

Bearing Seat InspectionPress-Fit BushingsCarbide Contact PointsAerospace Quality Control