6-12mm Three Point Internal Bore Micrometer Sets - 3227 Series (Insize)

The Insize 3227 6-12 mm Internal Bore Micrometer Set is designed for precise internal diameter measurements across a range of parts. Its three-point contact design, ratchet stop, and carbide measuring faces deliver repeatable readings quickly, making it ideal for quality control, machining, and assembly work.

With a measurement range up to 300 mm when using the included extension rods and setting rings, this set provides versatility for small bores and larger cavities alike. The 0.001 mm graduation ensures fine, easily readable increments for tight tolerances.

• Three-Point Alignment: Centers the measurement on the bore with three contact points to minimize eccentric errors and deliver true bore sizes, time after time.
• Carbide Measuring Faces: Durable, wear‑resistant faces stand up to repeated measurements on metal bores, helping maintain accuracy longer between servicing.
• Extended Range with Accessories: Supplied with setting rings and extension rods to cover a wide range—from standard 6–12 mm bores up to 300 mm overall—while preserving precise 0.001 mm graduations.

This set provides a reliable, repeatable bore measurement solution that can speed up inspections, reduce rework, and improve overall accuracy across production runs.