Spi 13-238-1 Steel Parallel Set 12x3x1.5 Inch

Product Description

The SPI 13-238-1 is a matched pair of precision steel parallels used for workholding and setup in machining operations. Each parallel measures 12 inches long, 3 inches high, and 1.5 inches thick. The pair is ground to a parallelism tolerance of 0.0003 inches, making them suitable for demanding layout, inspection, and milling setups where consistent, repeatable part support is critical. Machinists and tool-and-die professionals rely on matched parallel sets to support workpieces in vises, on surface plates, and in fixture assemblies. The steel construction provides the hardness and stability required for frequent shop use.

Matched parallel sets like the SPI 13-238-1 are used in general machining shops, tool rooms, and precision manufacturing environments. They are most commonly set under workpieces held in milling vise jaws to establish a consistent reference height and ensure the part sits flat and level during cutting or inspection. The 3-inch height and 1.5-inch thickness make this pair well suited for larger workpieces that require solid, stable support. These parallels are sold as a matched pair per package.

Key Features

• Ground to 0.0003-inch parallelism tolerance for precision setup work
• 12-inch length accommodates larger workpieces and long-span vise setups
• 3-inch height provides substantial lift for workpiece clearance in milling vises
• 1.5-inch thickness delivers a stable, rigid base that resists tipping or rocking
• Steel construction offers hardness and durability suitable for repeated shop use
• Sold as a matched pair to ensure consistent height reference across both supports

Compatibility

Designed as a general-purpose matched parallel set for use in standard machining vises, surface plates, and fixture setups where a 12-inch by 3-inch by 1.5-inch parallel is required.

Installation Notes

Place the parallels on a clean, burr-free vise or fixture surface before seating the workpiece to avoid rocking or inaccurate reference. Inspect parallel surfaces for nicks or debris before each use, as surface contamination directly affects setup accuracy. Store parallels as a matched pair to preserve the ground tolerance relationship between the two pieces.