10-12mm 0.39-0.47" Three Point Internal Bore Micrometer - 3227 Series (Insize)

The Insize 3227 Series Internal 3-Point Bore Micrometer is a precision tool designed to measure internal diameters with confidence. Its three-point contact and carbide measuring faces deliver stable, repeatable readings, even in busy workshop environments.

With a measurement range up to 300 mm and a fine 0.001 mm graduation, this micrometer provides the detail you need for precise bore checks. A ratchet stop ensures consistent measuring force, and it’s supplied with a setting ring and extension rods to reach deeper bores and streamline setup.

• Three-point bore contact for stability: Three evenly spaced contact points align with the bore axis, reducing measurement errors from bore eccentricity and delivering true internal readings.
• Carbide measuring faces for wear resistance: Carbide contacts resist wear and deformation, maintaining accuracy over many measurements and across tougher bore materials.
• Ratchet stop and included accessories for repeatable measurements: The ratchet stop provides consistent pressure, while the setting ring and extension rods extend reach and simplify setup for challenging bores.

This bore micrometer supports reliable quality control and efficient inspection workflows. The combination of fine 0.001 mm resolution, durable carbide faces, and practical accessories helps you achieve accurate, repeatable results across a range of internal dimensions, from routine checks to precise bore gauging in production and maintenance tasks.