125-150mm 4.92-5.91" Three Point Internal Bore Micrometer - 3227 Series (Insize)

The Insize 3227 Series three-point internal bore micrometer is the reliable tool you reach for when measuring inside holes and cylinders with precision. Designed for the 125–150 mm bore range, it’s suited for engineers, machinists, maintenance technicians, and serious hobbyists who value consistent results and fast setup.

Built for repeated use, this micrometer uses two sets of interchangeable jaw s, carbide measuring faces, and a ratchet stop to deliver durable, ware-resistant performance. It features a precise 0.005 mm graduation and includes extension rods to access deeper bores, making it a versatile choice for everyday workshop tasks.

• Two jaw sets for flexible bore range: Quickly adapt the tool to different internal sizes by swapping jaws, enabling accurate measurements across multiple bore diameters with one instrument.
• Carbide faces with ratchet stop: Hardened contact surfaces resist wear and provide repeatable readings by maintaining consistent pressure during each measurement.
• Extension rods included: Reach into deeper bores without removing the micrometer, reducing downtime and boosting measurement efficiency.

This internal bore micrometer helps streamline your workflow by delivering dependable, repeatable results in fewer steps. The three-point contact design minimizes measurement error, while the durable carbide faces and built-in ratchet stop protect accuracy over time. With extension rods and precise 0.005 mm graduations, you’ll measure quickly, confidently, and with less rework—whether you’re in a busy production line or a hands-on workshop.