Spi MS170307042 Cylindrical Gage Block Jaws Pair

Product Description

The SPI MS170307042 is a pair of cylindrical jaws designed for use with rectangular gage blocks in precision measurement applications. Each jaw features a 0.25 inch radius profile and a 0.315 inch jaw thickness, with an overall length of 2.366 inches. Radius accuracy is held to 0.00003 inches per jaw, and pair accuracy is rated at 0.00004 inches. These jaws are sold as a set of two and are intended for metrology professionals, quality technicians, and tool room machinists who need repeatable, high-accuracy outside diameter and radius measurements using standard gage block assemblies.

These cylindrical jaws attach to rectangular gage blocks to extend their measurement capability to curved and cylindrical surfaces. Typical applications include inspection rooms, toolrooms, and manufacturing quality control environments where gage block setups must measure shaft diameters, bore references, or radius features. The pair format ensures matched accuracy across both contact points, which is critical for maintaining traceable measurement results in calibration and inspection workflows.

Key Features

• Cylindrical jaw profile with 0.25 inch radius for curved surface measurement
• Radius accuracy of 0.00003 inches per individual jaw
• Pair accuracy of 0.00004 inches for matched measurement performance
• 0.315 inch jaw thickness for stable contact and block attachment
• 2.366 inch overall length compatible with standard rectangular gage block sets
• Sold as a matched pair of 2 pieces

Compatibility

Designed for use with rectangular gage blocks as stated by the manufacturer. Specific gage block brand or series compatibility was not provided in the available product data.

Installation Notes

These jaws are installed by metrology technicians or quality control personnel familiar with gage block wringing and assembly procedures. Clean all mating surfaces thoroughly before attaching the jaws to the gage block to prevent contamination that could affect accuracy. Handle with lint-free gloves to avoid thermal expansion errors and surface corrosion from skin contact. Store in a protective case when not in use to preserve the precision-ground jaw surfaces.