Mitutoyo 511-201 Small Hole Bore Gauge 10-18.5mm

USD 151.00

Mechanical bore gauge body for 10-18.5mm internal diameter measurements. Features a 2-point self-centering design with carbide-tipped contact points.

SKU Mitutoyo-511-201 Category
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Mitutoyo 511-201 Small Hole Bore Gauge 10-18.5mm

Model Identifier 511-201
Official Part Number 511-201
GTIN Standard 4946368092393

Technical Overview

Mechanical bore gauge body for 10-18.5mm internal diameter measurements. Features a 2-point self-centering design with carbide-tipped contact points.

Key Features

  • 10 mm to 18.5 mm measuring range covers a broad span of small bore sizes with a single gauge body
  • Two-point contact system dynamically detects geometry issues such as ovality and taper
  • Carbide-tipped contact points and anvils provide superior abrasion and wear resistance
  • Standard 8 mm stem diameter accommodates various dial indicators or digital indicators
  • Includes 9 interchangeable alloy steel anvils and 1 spacer (0.5 mm thick) for precise incremental adjustments
  • Hollow grip structure reduces operator hand-to-gauge heat transfer by 50% to maintain measurement stability

None (Manual Mechanical Operation)

Technical Specification Matrix

ParameterValue
Measuring Range10 - 18.5 mm
Accuracy± 5 µm
Indication Stability2 µm
Measuring Depth100 mm
Stem Diameter8 mm
Measuring Force≤ 2 N
Stroke of Contact Point0.6 mm
Number of Anvils9 (Alloy Steel, Carbide-tipped)
Number of Spacers1 (0.5 mm thick)
Measurement SystemMetric
Contact Type2-Point Self-Centering Bridge
Indicator IncludedNo (Sold Separately)
Physical Weight (kg)0.31
Dimensions L x W x H (cm)24.13 x 13.97 x 5.08

Industrial Applications

1. Automotive Valve Guide & Small Cylinder Inspection

Utilizing the 2-point contact system to check the precise inner diameter of valve guides and minor engine cylinders within the 10-18.5 mm range during automotive manufacturing quality control.

Problem Solved

Detects ovality, taper, and concentricity errors down to ±5 µm accuracy, preventing engine valve seizure or compression loss in high-tolerance assemblies.

ovalitytapervalve guidescylinder borebore measurement

2. Precision Hydraulic Spool Valve Sleeve Metrology

Verifying the tight tolerances of hydraulic spool sleeves and valve blocks where small, deep bores require highly accurate dimension control.

Problem Solved

Allows quality inspectors to verify bore diameters up to 100 mm deep using a lightweight manual gauge with carbide-tipped anvils that resist frictional wear from hardened hydraulic steel alloys.

hydraulic sleevesspool valvesinternal diametercarbide-tippedwear resistance

3. Aerospace Micro-Bearing Housing Alignment

Verifying bearing housing IDs and journals prior to press-fit installation of micro-bearings on aircraft assembly floors.

Problem Solved

Eliminates thermal expansion errors during prolonged manual inspection. The 50% heat-shielding hollow grip ensures that human hand warmth does not expand the probe stem, maintaining 2 µm repeatability.

bearing housingpress-fit alignmentthermal isolationrepeatabilitymicron accuracy
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