Spi 13-204-3 Steel Parallel 6in X 1-1/4in X 1/2in

Product Description

The SPI 13-204-3 is a precision-ground steel parallel designed for use in machining, inspection, and setup work. Measuring 6 inches long, 1-1/4 inches high, and 1/2 inch thick, this parallel features four precision-ground faces with a parallelism tolerance of 0.0003 inches and a squareness tolerance of 0.0005 inches. Manufactured from high-grade hardened tool steel with a Rockwell hardness rating of 50 Rc, it delivers the dimensional consistency that machinists and toolroom professionals require for accurate workholding and part setup. Sold as a matched pair.

Steel parallels of this type are standard toolroom equipment used in milling, grinding, and inspection applications. They support workpieces in vises, on surface plates, and in fixtures to establish a precise reference plane. The 6-inch length and 1-1/4-inch height make this pair well suited for general-purpose setup work in both production and job-shop environments. Machinists, tool and die makers, and quality control technicians are the primary users of this type of parallel.

Key Features

• Four precision-ground faces for versatile orientation in the setup
• Parallelism tolerance of 0.0003 inches for repeatable accuracy
• Squareness tolerance of 0.0005 inches
• High-grade hardened tool steel construction at 50 Rc hardness
• Sold as a matched pair for consistent workholding setups

Compatibility

Designed as a general-purpose precision parallel compatible with standard milling vises, surface plates, and fixturing setups where a 6-inch length, 1-1/4-inch height, and 1/2-inch thickness are appropriate.

Installation Notes

Parallels should be cleaned of chips and debris before each use to prevent measurement error or workpiece tipping. Handle with care to avoid dropping, which can damage ground surfaces or alter tolerances. Store in a protected case or on a padded surface to preserve the precision-ground faces between uses.