Spi 13-212-6 Steel Parallel 6x1x0.25 Inch Precision Ground

Product Description

The SPI 13-212-6 is a hardened steel parallel designed for precision machining and inspection setups. Measuring 6 inches long, 1 inch high, and 0.25 inches thick, this four-face precision-ground parallel delivers a parallelism tolerance of 0.0003 inches and a squareness tolerance of 0.0005 inches. Hardened to 50 HRC, the tool resists wear and maintains dimensional stability under repeated use. It is sold as a matched pair, making it suitable for applications that require balanced workpiece support across a vise or fixture plate. Machinists and toolroom professionals rely on this type of parallel for accurate part positioning during milling, grinding, and inspection operations.

This parallel is used in machine shop and toolroom environments where consistent, repeatable workpiece elevation is required. Typical applications include supporting parts in milling vises, aligning workpieces on surface plates, and setting up precision grinding operations. The matched-pair format is standard practice for balanced clamping setups in both production and maintenance machining contexts. Suited for use in job shops, manufacturing facilities, and maintenance repair operations.

Key Features

• Four-face precision ground for consistent contact on all sides
• Parallelism tolerance of 0.0003 inches for high-accuracy setups
• Squareness tolerance of 0.0005 inches
• Hardened to 50 HRC for long-term wear resistance
• High-grade hardened tool steel construction
• Sold as a matched pair for balanced vise and fixture setups

Compatibility

Designed as a general-purpose precision parallel compatible with standard machinist vises, surface plates, and fixture setups requiring 6-inch length, 1-inch height, and 0.25-inch thickness dimensions.

Installation Notes

Installation and use of precision parallels is typically performed by machinists and toolroom technicians. Clean all mating surfaces before placing parallels to prevent debris from affecting setup accuracy. Handle with care to avoid nicks or burrs that could compromise ground surfaces. Store in a protective case when not in use to maintain surface integrity.