Spi 13-215-9 Steel Precision Parallel Set 6x1-5/8x1/4 Inch

Product Description

The SPI 13-215-9 is a matched pair of four-face precision-ground steel parallels used for accurate workpiece setup and positioning in machining and grinding operations. Each parallel measures 6 inches long, 1-5/8 inches high, and 1/4 inch thick, with a parallelism tolerance of 0.0003 inches and squareness of 0.0005 inches. Manufactured from high-grade hardened tool steel at 50 Rc hardness, these parallels deliver the dimensional stability required for precision layout, milling, and surface grinding work. Machinists, toolmakers, and metrology technicians rely on this type of parallel for repeatable, accurate part positioning.

These parallels are suited for use in machine shops, tool rooms, and production environments where consistent workpiece elevation and alignment are critical. The four precision-ground faces allow the parallels to be used in multiple orientations, increasing versatility across setup tasks. The matched pair configuration ensures both parallels are within the same tolerance band, making them appropriate for operations where symmetry and consistent height are required on both sides of a workpiece.

Key Features

• Parallelism tolerance of 0.0003 inches for high-accuracy setups
• Squareness tolerance of 0.0005 inches across all faces
• Four precision-ground faces for multi-orientation use
• High-grade hardened tool steel construction at 50 Rc
• Sold as a matched pair within the same tolerance band
• Compact 1/4 inch thickness suits tight fixture and vise applications

Compatibility

Designed as a general-purpose precision parallel set compatible with standard milling vises, surface grinders, and machining fixtures that accommodate parallels 6 inches in length.

Installation Notes

Parallels should be installed by a qualified machinist or toolmaker following standard setup procedures for milling or grinding operations. Clean all mating surfaces before placing parallels in a vise or fixture to prevent debris from affecting accuracy. Handle with care to avoid nicks or burrs on the ground faces, which can compromise parallelism. Store the matched pair together to maintain traceability of the tolerance-matched set.