Precision Three-Point Internal Micrometer 6-50mm – Self-Centering Bore Gauge with Carbide Tips & Setting Ring

Self-centering 3-point for accurate measurement of internal diameters and through hole measurements (6-50mm).
measurement can be taken closer to the buttom of the blind bore and can be taken into a deep hole with an extension rod
Features self-centering carbide tips, ratchet thimble, and includes calibration ring. Resolution: 0.001mm (<12mm), 0.005mm (>12mm).

Product Description:

Three-Point Internal Micrometer 6-50mm – Precision Bore Measurement with Self-Centering Design

Experience exceptional accuracy in internal diameter measurements with our professional three-point internal micrometer. Specifically designed for both blind and through holes, this micrometer features a self-centering mechanism that ensures perfect alignment and reliable measurements. The carbide-tipped measuring contacts (excluding 6-12mm models) provide excellent wear resistance, while the included calibration ring guarantees ongoing accuracy. With resolution up to 0.001mm and ratchet thimble for consistent measuring force, this tool is ideal for precision machining, quality control, and manufacturing applications.

Technical Specifications:

Model Number (Silver)	Model Number (Black)	Measuring Range	Accuracy	Setting Ring	L1 Dimension	A Dimension	Extension Rod
H-315-04-050	H-315-04-150	12-16mm	0.004mm	Φ16mm	80mm	0.5mm	150mm
H-315-05-050	H-315-05-150	16-20mm	0.004mm	Φ16mm	80mm	0.5mm	150mm
H-315-06-050	H-315-06-150	20-25mm	0.004mm	Φ25mm	90mm	0.5mm	150mm
H-315-07-050	H-315-07-150	25-30mm	0.004mm	Φ25mm	90mm	0.5mm	150mm
H-315-08-050	H-315-08-150	30-40mm	0.004mm	Φ40mm	97mm	0.5mm	150mm
H-315-09-050	H-315-09-150	40-50mm	0.005mm	Φ40mm	97mm	0.5mm	150mm

Resolution:

0.001mm for measurements under 12mm
0.005mm for measurements over 12mm

Additional Features:

Ratchet thimble for consistent measuring force
Self-centering three-point design for automatic alignment
Carbide measuring faces (on models above 12mm)
Includes precision calibration ring
Suitable for both blind and through holes

Key Features:

Self-Centering Design: Three-point contact ensures automatic alignment and accurate measurements
Carbide-Tipped Contacts: Exceptional wear resistance for long-term accuracy (on models above 12mm)
Precision Calibration: Includes setting ring for easy verification and calibration
Dual Resolution: 0.001mm resolution for small diameters, 0.005mm for larger measurements
Ratchet Mechanism: Provides consistent measuring force for repeatable results
Blind Hole Capability: Specifically designed to measure both blind and through holes
Professional Accuracy: Maintains precision up to 0.004mm across most ranges

Applications:

Precision machining and tool rooms
Quality control and inspection departments
Automotive engine cylinder measurement
Hydraulic cylinder and pneumatic tube inspection
Mold and die manufacturing
Aerospace component measurement
Mechanical engineering and research

Additional Information:

Note: Models measuring 6-12mm feature steel measuring faces, while all larger models include carbide-tipped contacts for enhanced durability.

Available in Two Finishes:

Silver finish models (H-315-XX-050)
Black finish models (H-315-XX-150)