Spi 13-209-2 Steel Parallel Set 6x5/8x1/4 Inch

Product Description

The SPI 13-209-2 is a matched pair of four-face precision-ground steel parallels used for workholding, setup, and inspection tasks in machine shops and tool rooms. Each bar measures 6 inches long, 5/8 inches high, and 1/4 inches thick. Parallelism is held to 0.0003 inches and squareness to 0.0005 inches across all four precision-ground faces. The bars are manufactured from high-grade hardened tool steel at 50 Rc hardness, providing the rigidity and wear resistance required for repeatable, accurate setups in milling, grinding, and surface plate work.

These parallels are suited for use in precision machining environments where consistent workpiece elevation and alignment are critical. Typical applications include supporting workpieces in vises during milling operations, elevating parts for surface grinding clearance, and checking flatness or height during inspection. The matched-pair configuration ensures both bars perform identically, making them reliable for use together in tandem setups. They are appropriate for use in tool and die, maintenance and repair, and general metalworking operations.

Key Features

• Four-face precision-ground construction for maximum versatility in setup orientation
• Parallelism of 0.0003 inches for consistent, repeatable workholding accuracy
• Squareness of 0.0005 inches across ground faces
• High-grade hardened tool steel at 50 Rc hardness for long-term wear resistance
• Sold as a matched pair for reliable tandem use
• Compact 6 inch x 5/8 inch x 1/4 inch profile fits standard milling vises

Compatibility

Designed as a general-purpose precision parallel set for use with standard milling vises, surface grinders, and inspection surface plates in metalworking and tool room environments.

Installation Notes

Installation and setup of precision parallels should be performed by qualified machinists or tool room technicians. Clean all mating surfaces and the parallels thoroughly before use to prevent debris from affecting setup accuracy. Do not use parallels as striking tools or clamp them beyond their rated contact area, as this can induce distortion and compromise ground surfaces. Store in a protective case or dedicated slot block when not in use to preserve ground face integrity.