Spi 98-455-9 Steel Parallel Set 6x1x0.125 Inch

Product Description

The SPI 98-455-9 is a matched pair of hardened steel precision parallels used for workholding, setup, and inspection in machining and metrology applications. Each parallel measures 6 inches long by 1 inch high by 0.125 inches thick and is precision ground on all four faces. Manufactured from high-grade hardened tool steel with a hardness of 50 Rc, these parallels maintain a squareness tolerance of 0.0005 inches per 1 inch, making them suited for exacting setups on surface plates, milling machines, and grinding fixtures. Machinists, toolmakers, and precision metrology technicians rely on four-face ground parallels for repeatable, accurate part positioning.

These parallels are used in machine shops, toolrooms, and quality control environments where consistent workpiece elevation and alignment are required. Common applications include supporting workpieces in vises for milling or grinding operations, establishing reference datums on surface plates, and verifying squareness during inspection. The matched-pair format ensures interchangeability and consistent stack height when used together.

Key Features

• Precision ground on all four faces for consistent contact and accurate referencing
• High-grade hardened tool steel construction at 50 Rc hardness for wear resistance
• Squareness tolerance of 0.0005 inches per 1 inch for tight-tolerance setups
• Sold as a matched pair for interchangeable use and consistent stack height
• Compact 0.125-inch thickness suits narrow vise setups and confined workholding situations

Compatibility

Designed as a standard-format precision parallel compatible with common milling vises, grinding fixtures, and surface plate setups requiring 6-inch length, 1-inch height, and 0.125-inch thickness.

Installation Notes

Precision parallels are typically handled and positioned by machinists and toolmakers; no power tools or fasteners are required for use. Clean mating surfaces on the vise, fixture, or surface plate before placing parallels to avoid debris affecting height accuracy. Store parallels in a protective case or pouch when not in use to prevent nicking the ground faces. Handle with care to avoid dropping, as impact can affect ground surface integrity and dimensional accuracy.