Spi 13-230-8 Steel Parallel Set 9x1x0.5 Inch Matched Pair

Product Description

The SPI 13-230-8 is a matched pair of four-face, precision-ground steel parallels used for workholding, setup, and inspection in machining and metalworking operations. Each parallel measures 9 inches long, 1 inch high, and 0.5 inches thick. The set holds a parallelism tolerance of 0.0003 inches and a squareness tolerance of 0.0005 inches across all four ground faces. Hardened to 50 Rc, these parallels resist wear and maintain dimensional stability under repeated use. Machinists, toolmakers, and quality technicians install these in milling vises, surface plates, and CMM setups.

These parallels are suited for precision metalworking environments including machine shops, toolrooms, and quality inspection departments. The matched-pair configuration allows technicians to support workpieces at consistent, equal heights during milling, grinding, or layout operations. The four-face ground design provides multiple reference surfaces, giving the user flexibility in orientation without sacrificing accuracy. Both pieces in the pair are ground to the same dimensions, making them interchangeable within the set.

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 per parallel for versatile orientation
• Hardened to 50 Rc for durability and wear resistance
• High-grade hardened tool steel construction
• Sold as a matched pair, ground to matching dimensions

Compatibility

Designed as a general-purpose precision parallel set for use in standard milling vises, surface grinders, surface plates, and inspection fixtures that accept parallels measuring 9 inches long, 1 inch high, and 0.5 inches thick.

Installation Notes

Installation is performed by machinists and toolmakers as part of workholding or inspection setup. Clean all mating surfaces before placing parallels in the vise or fixture to prevent debris from affecting accuracy. Do not hammer or pry parallels during setup, as impact can damage ground surfaces and compromise tolerances. Handle with care and store in a protective case or designated location to prevent corrosion and surface damage.