Spi 98-452-6 Steel Parallel Set 6x5/8x1/8 Inch 4-face

Product Description

The SPI 98-452-6 is a hardened steel parallel sold as a matched pair, designed for precision layout, inspection, and machining setups. Each parallel measures 6 inches long, 5/8 inch high, and 1/8 inch thick. All four faces are precision ground to a squareness tolerance of 0.0005 inches per 1 inch, making these suitable for applications where accurate workpiece support and alignment are critical. The tool steel construction is hardened to 50 Rc, providing resistance to wear and deformation under repeated shop use. These parallels are a standard workholding accessory used by machinists, toolmakers, and quality technicians.

Four-face ground parallels in this size range are commonly used in milling, grinding, and surface plate inspection work. They support workpieces in vises or on magnetic chucks to establish consistent reference heights. The 6-inch length covers a wide range of part sizes in general machining environments. The 1/8-inch thickness allows use in tight vise setups where thicker parallels would not fit. This pair is appropriate for both production shops and tool-and-die operations requiring repeatable, high-accuracy workholding.

Key Features

• All four faces precision ground for consistent reference surfaces
• Squareness tolerance of 0.0005 inches per 1 inch
• Hardened to 50 Rc for wear resistance and long service life
• High-grade hardened tool steel construction
• Sold as a matched pair for balanced vise and chuck support
• 1/8-inch thickness suits tight-clearance vise setups

Compatibility

Designed as a standard OEM-style replacement and general-use parallel suitable for manual mills, surface grinders, and surface plate inspection setups requiring a 6-inch parallel in the 5/8-inch height range.

Installation Notes

Installation and use is performed by machinists and toolmakers in machine shop environments. Clean all contact surfaces before placing parallels in a vise or on a magnetic chuck to prevent debris from affecting accuracy. Handle with care to avoid nicking the ground faces, as surface damage will compromise the squareness tolerance. Store in a protective case or with a light coat of oil to prevent corrosion.