Spi 31-472-4 Inside Outside Diameter Caliper Attachment 8 Pc

Product Description

The SPI 31-472-4 is an 8-piece inside and outside diameter attachment set designed for use with 6-inch dial or electronic calipers. The set expands the measurement capability of a standard caliper, allowing technicians to take accurate ID and OD readings across a range of thread pitches. It includes four pairs of OD inserts along with instructions. Chrome finish on the inserts provides corrosion resistance and durability in shop environments. At 0.25 pounds, the complete set is compact and easy to store in a toolbox or instrument case. This accessory is well suited for machinists, tool-and-die workers, and precision measurement technicians.

This attachment set is intended for use in precision measurement applications where standard caliper jaws are insufficient for accurate inside or outside diameter readings. It is appropriate for machine shops, manufacturing facilities, and maintenance environments where thread pitch measurement and bore gauging are routine tasks. The four pitch ranges covered by the insert pairs make this a versatile accessory for general-purpose metrology work with 6-inch dial or electronic calipers.

Key Features

• 8-piece set includes four pairs of OD inserts and instructions
• Compatible with 6-inch dial or electronic calipers
• Covers four thread pitch ranges: 0.60 to 1.00 mm, 1.00 to 1.50 mm, 1.50 to 2.50 mm, and 2.50 to 4.00 mm
• Chrome finish for corrosion resistance and wear durability
• Lightweight at 0.25 pounds for easy handling and storage

Compatibility

Designed for use with 6-inch dial or electronic calipers. Specific caliper brand or model compatibility is not stated by the manufacturer for this attachment set.

Installation Notes

Installation and removal of caliper attachments should be performed by a qualified machinist or metrology technician. Before attaching or removing inserts, ensure the caliper is zeroed and clean of debris to maintain measurement accuracy. Follow the included instructions for proper insert seating to avoid damage to the caliper jaw faces. Do not force inserts onto caliper jaws that are not dimensionally compatible with this accessory.