20-50mm Three Point Internal Bore Micrometer Sets - 3227 Series (Insize)

The Insize 3227 Three-Point Internal Bore Micrometer Set is a precision instrument designed to measure inside bores with stable, repeatable readings. Ideal for engineers, machinists, and quality-control professionals, it helps verify internal diameters in cylinders, housings, and fittings where bore accuracy matters.

With a carbide measuring face and a ratchet stop, this internal bore micrometer is built to withstand demanding workshop use and deliver durable, wear-resistant performance. The set covers a range with a graduation of 0.005 mm and includes setting rings and extension rods for flexible measurement depths, so you can tackle a variety of bore sizes without changing instruments. Measurements up to 300 mm are supported, making it suitable for a broad spectrum of components.

• Wide measurement range up to 300 mm: Enables accurate internal bore checks across common sizes without swapping tools, speeding up setups and measurement cycles.
• Carbide measuring faces for long wear life: Provides exceptional durability against wear, preserving accuracy through repeated measurements in busy shops.
• Complete kit with setting rings and extension rods: Includes everything needed to measure deep and varied bores, increasing versatility and reducing downtime.

This bore micrometer set helps you streamline bore gauging, deliver repeatable results, and maintain high-quality tolerances across automotive, hydraulic, and industrial components. The comfortable, consistent feel of the ratchet stop ensures reliable measurements, while the carbide faces resist wear in dirty environments, giving you confidence in every reading.