Spi 30-470-9 Groove Master Caliper Attachment Set 5 Pc

Product Description

The SPI 30-470-9 is a five-piece Groove Master attachment set designed to extend the measuring capability of standard 6-inch Vernier, dial, and digital calipers. Each attachment is machined from steel with a hard chrome finish for durability and corrosion resistance. The set measures internal grooves and bores with an accuracy of 0.001 inch across a measurement range of 0.200 to 6.000 inches. Overall length is 6 inches. Licensed machinists, tool and die technicians, and precision measurement professionals use this set when standard caliper jaws cannot access grooved or recessed features.

The 30-470-9 is suited for shop-floor and inspection-room applications where groove geometry must be verified on machined parts. The set covers groove depths of 1.75, 5.00, 6.50, 9.50, and 13.00 millimeters and minimum bore diameters of 5.00, 7.50, 15.00, and 18.00 millimeters. Minimum pitch is 0.60 millimeters and maximum pitch is 4.00 millimeters. This range of coverage makes the set appropriate for threading, snap-ring groove, and internal undercut verification across a variety of workpiece sizes.

Key Features

• Fits standard 6-inch Vernier, dial, and digital calipers without modification
• Hard chrome finish over steel construction for wear and corrosion resistance
• Accuracy of 0.001 inch across the full measurement range
• Measurement range of 0.200 to 6.000 inches
• Five attachments covering multiple groove depths and bore diameter ranges
• Pitch range of 0.60 to 4.00 millimeters accommodates a broad selection of groove profiles

Compatibility

Designed for use with 6-inch Vernier, dial, and digital calipers. Confirm your caliper jaw geometry and flange width of 0.65 inches before ordering to ensure proper fitment.

Installation Notes

Installation and removal of the attachments should be performed by a qualified metrology or machining professional familiar with precision measuring instruments. Ensure the caliper is zeroed and calibrated before attaching the Groove Master set. Do not overtighten any clamping mechanism, as doing so may affect caliper accuracy or damage the attachment. Store attachments in the provided case when not in use to protect finished surfaces.