12-20mm Three Point Internal Bore Micrometer Sets - 3227 Series (Insize)

The Insize 3227 Series Internal Three-Point Bore Micrometer Set is a precision measuring tool designed to accurately gauge bore diameters inside cylinders, housings, and other recessed features. Its three-point contact delivers stable, repeatable readings in hard-to-reach bores, making it a reliable companion for engineers, machinists, inspectors, and maintenance technicians. This set is built for everyday use in workshops and on the shop floor, helping you achieve consistent tolerances with confidence.

With a measurement range up to 300 mm and a fine 0.005 mm graduation, the micrometer incorporates carbide measuring faces for exceptional wear resistance and a ratchet stop to ensure uniform measuring pressure. Supplied with setting rings and extension rods, it comes ready to expand your bore inspection capabilities and adapt to a variety of bore depths.

• Three-Point Internal Bore Contact: Engages the bore at three evenly spaced points to deliver true diameter readings with minimal deflection, even in awkward or deep bores.
• Carbide Measuring Faces with Ratchet Stop: Provides long-lasting wear resistance and consistent force, preventing overloading and ensuring repeatable, accurate measurements across many cycles.
• Complete Set with Setting Rings and Extension Rods: Includes all essential accessories for quick setup and flexible measurement coverage, stored in a rugged case for easy transport and organized use.

This bore micrometer set supports reliable, repeatable measurements that streamline quality checks, reduce downtime, and improve overall measurement confidence. Its durable construction and comprehensive accessory kit help you maintain tight tolerances across a range of parts and applications, making it a practical investment for any workshop aiming for precise, efficient bore inspection.