175-200mm 6.89-7.87" Three Point Internal Bore Micrometer - 3227 Series (Insize)

The Insize 3227 Series Three Point Internal Bore Micrometer is designed for precise measurements of internal diameters across a broad range. With a three-point contact design, carbide measuring faces for wear resistance, and a built-in ratchet stop, this tool delivers repeatable readings in demanding workshop environments. Includes extension rods for extra reach and two sets of interchangeable jaws to cover multiple measuring ranges without swapping instruments. The graduation is 0.005 mm for fine, reliable checks on every part.

• Interchangeable jaw sets for flexible measuring ranges: Two jaw sets let you cover different bore sizes quickly, reducing downtime and keeping measurement workflows efficient.
• Carbide measuring faces for long wear life: Durable carbide surfaces resist wear and provide stable, repeatable measurements over years of use.
• Ratchet stop for consistent measuring force: Maintains uniform contact pressure, protecting surfaces and delivering repeatable results every time.

With its durable construction and thoughtful features, this micrometer helps you speed up bore checks, reduce rework, and maintain high quality across batches. Extension rods are included to reach deeper bores, and there is an optional setting ring (6312) that can simplify pre-setting for production runs—making the 3227 series a versatile choice for precision measurement in engineering, manufacturing, and QA workflows.