Spi 31-470-8 Id Od Diameter Caliper Attachment 16 Pc

Product Description

The SPI 31-470-8 is a 16-piece inside and outside diameter attachment set designed for use with 6-inch dial or electronic calipers. The kit extends the measurement capability of a standard caliper by providing interchangeable insert pairs that allow technicians to accurately gauge both internal and external diameters across a range of thread pitches. The chrome-finished inserts are supplied in four pitch ranges, covering 0.60 mm through 4.00 mm pitch, making this set applicable across a broad spectrum of measurement tasks in tool rooms, machine shops, and quality control environments.

This attachment set is intended for precision measurement applications where a standard caliper jaw cannot access or accurately capture an inside or outside diameter directly. Typical use cases include measuring threaded features, bores, and cylindrical surfaces in manufacturing and inspection settings. The set is compatible with 6-inch dial calipers and 6-inch electronic calipers and is suited for use by machinists, metrologists, and skilled tradespersons who require repeatable, accurate diameter readings.

Key Features

• Includes 4 pairs of ID inserts and 4 pairs of OD inserts for versatile diameter measurement
• Covers four thread pitch ranges: 0.60-1.00 mm, 1.00-1.50 mm, 1.50-2.50 mm, and 2.50-4.00 mm
• Chrome finish on inserts for corrosion resistance and durability
• Compatible with standard 6-inch dial or electronic calipers
• 16-piece set includes instructions for proper use

Compatibility

Designed for use with 6-inch dial or electronic calipers as stated by the manufacturer.

Installation Notes

Installation and use of this attachment set is typically performed by machinists or quality control technicians in a shop environment. Before attaching inserts to the caliper, ensure the caliper jaws are clean and free of debris to maintain measurement accuracy. Follow the included instructions to seat each insert pair correctly for the intended pitch range. Do not force inserts onto the caliper jaws, as improper fitment can damage the caliper or produce inaccurate readings.