20-25mm 0.79-0.98" Three Point Internal Bore Micrometer - 3227 Series (Insize)

The Insize 3227 Series Three Point Internal Bore Micrometer is a precision tool designed for accurate inside measurements where bore walls are hard to reach with standard calipers. Its three‑point contact provides stable, repeatable readings across the bore, making it ideal for engine cylinders, hydraulic housings, and other small to medium internal diameters. Built for daily workshop use, this micrometer pairs robust construction with reliable performance.

• Three‑point internal bore measurement: Ensures stable, repeatable readings across the bore by distributing contact pressure evenly for more accurate internal diameters.
• Carbide measuring faces: Wear‑resistant tips that maintain accuracy over time, delivering long tool life in demanding machining environments.
• Ratchet stop with setting ring: Delivers consistent measuring force to prevent over‑tightening, while the included setting ring enables quick, repeatable zeroing and gauging.

Operating range and precision are designed to support tight tolerances with ease: 20–25 mm (0.79–0.98 in) working range, total capacity up to 300 mm, and a fine 0.005 mm graduation. The combination of carbide faces, a reliable ratchet mechanism, and a setting ring ensures you can achieve repeatable results day after day, making bore inspections faster and more dependable for professionals and serious hobbyists alike.