87-100mm 3.43-3.94" Three Point Internal Bore Micrometer - 3227 Series (Insize)

The Insize 3227 three-point internal bore micrometer is a precision tool designed to accurately measure inside diameters with repeatable results. Suited for engineers, machinists, quality-control staff, and workshop enthusiasts, it uses a three-point contact to deliver consistent readings on bores, bushings, and cylindrical housings. Built with carbide measuring faces and a ratchet stop, it offers durability and controlled contact for reliable measurements, and it covers a wide range up to 300 mm with a fine 0.005 mm graduation. The instrument is supplied with a setting ring for quick, repeatable setup.

• Three-point contact for true bore readings: The three-point design provides stable, accurate contact inside the bore, improving roundness detection and reducing measurement errors on cylindrical parts.
• Durable carbide faces with ratchet stop: Carbide measuring faces resist wear for long-term accuracy, while the ratchet stop ensures a consistent measuring force for repeatable results.
• Wide range to 300 mm with precise 0.005 mm graduation: Combines broad measurement capability with fine resolution, and includes a setting ring to speed setup and ensure quick, repeatable checks.

This combination supports efficient bore inspection, helps reduce rework, and improves workflow across production and QC environments. With straightforward operation, durable construction, and dependable readings, the 3227 is a trustworthy choice for demanding internal bore measurements.