Spi 30-463-4 Caliper Attachment Set 3 Pc 6 Inch

Product Description

The SPI 30-463-4 is a three-piece caliper attachment set designed to extend the measurement capability of standard 6-inch vernier, dial, and digital calipers. The set enables groove depth and bore depth measurements that a plain caliper jaw cannot reach on its own. Attachments are machined from steel with a hard chrome finish for durability and corrosion resistance. Accuracy is rated at 0.001 inches, making this set appropriate for precision layout and inspection work. Maximum measurement capacity follows the host caliper at 6 inches overall. Licensed machinists, tool-and-die technicians, and quality-control inspectors are the primary users.

This attachment set is suited for shop-floor and inspection bench applications where internal groove dimensions and bore depths must be measured without a dedicated groove micrometer. The three attachments cover a range of groove depths and bore sizes: groove depths of 0.05, 0.07, and 0.2 inches, and maximum bore depths of 0.4, 0.625, and 1.0 inches. Flange widths of 0.015 and 0.025 inches allow the attachments to enter narrow grooves. The set is designed for use with 6-inch vernier, dial, and digital calipers.

Key Features

• Three-piece set covering multiple groove depths and bore depth ranges in a single kit
• Rated accuracy of 0.001 inches for precision measurement work
• Steel construction with hard chrome finish for wear and corrosion resistance
• Flange widths of 0.015 and 0.025 inches for access to narrow grooves
• Maximum bore depths of 0.4, 0.625, and 1.0 inches across the three attachments
• 6-inch overall length matches standard 6-inch caliper travel

Compatibility

Designed for use with 6-inch vernier, dial, and digital calipers.

Installation Notes

Attachment sets of this type are mounted and removed by machinists or metrology technicians familiar with caliper operation. Ensure the caliper jaws and attachment contact surfaces are clean and free of chips or burrs before fitting an attachment. Zero or re-datum the caliper after each attachment change to confirm accurate readings. Follow your shop's calibration and inspection procedures when using attachments for production or quality-control measurements.