Spi 30-468-3 Caliper Groovemaster 6 Inch Calipers

Product Description

The SPI 30-468-3 is a Groovemaster caliper accessory designed to extend the capability of standard 6-inch vernier, dial, and digital calipers for internal groove measurement. Constructed from steel with a hard chrome coating, it delivers accurate bore and groove readings in precision measurement applications. The accessory achieves an accuracy of 0.0010 inches and reaches a groove depth of 0.2550 inches. A flange width of 0.04 inches allows it to enter narrow grooves. This tool is suited for machinists, toolroom technicians, and quality control professionals who need reliable internal groove data without a dedicated groove-measuring instrument.

The SPI 30-468-3 Groovemaster is used in machine shops, toolrooms, and production environments where internal groove dimensions must be verified. It attaches to compatible 6-inch vernier, dial, and digital calipers, converting a standard caliper into a groove-capable measuring tool. Typical applications include checking snap-ring grooves, retaining-ring seats, and similar internal features with a minimum bore diameter of 0.7250 inches and a maximum bore depth of 1.2500 inches.

Key Features

• Hard chrome coating resists wear and corrosion for extended service life
• Steel construction provides rigidity and dimensional stability during measurement
• Accuracy of 0.0010 inches suitable for close-tolerance work
• Groove depth capacity of 0.2550 inches covers common internal groove profiles
• Minimum bore diameter of 0.7250 inches accommodates a wide range of bore sizes
• Compatible with 6-inch vernier, dial, and digital calipers — no dedicated instrument required

Compatibility

Designed for use with 6-inch vernier, dial, and digital calipers as stated by the manufacturer.

Installation Notes

Installation and use of this accessory does not require electrical lockout but calipers should be zeroed and verified for calibration before attaching the Groovemaster. Ensure the caliper jaws are clean and free of burrs before mounting the accessory. Follow the caliper manufacturer's instructions for securing any jaw-mounted accessory to avoid measurement error or damage to the caliper beam.