Spi 13-197-9 16 Piece Parallel Set 6 Inch 52-58 Rc

Product Description

The SPI 13-197-9 is a 16-piece hardened parallel set designed for precision machining, grinding, and milling setups. Each parallel measures 6 inches in length and 1/2 inch thick, with heights ranging from 7/8 inch to 1-3/4 inch in 1/8-inch increments. The set is hardened to 52-58 RC for durability and resistance to wear under repeated clamping and fixture loads. Parallelism is held to 0.0003 inch across the full length, making this set suitable for applications where consistent workpiece elevation and squareness are critical. The set is supplied as 8 matched pairs and comes furnished in a fitted carrying case. Machinists, tool and die makers, and precision grinders are the primary users.

This parallel set is used in machine shop environments for supporting workpieces in vises, on magnetic chucks, and in fixture setups on milling machines and surface grinders. The range of heights — 7/8 inch through 1-3/4 inch — allows the user to elevate a part precisely to clear clamps, expose features for cutting, or achieve consistent datums across multiple setups. Each parallel includes two drilled holes to aid in removal from tight vise jaws using a punch or pin. The set is suited for both production and toolroom use in residential, commercial, and industrial machine shops.

Key Features

• 16 pieces supplied as 8 matched pairs in 1/8-inch height increments from 7/8 inch to 1-3/4 inch
• Uniform 6-inch length and 1/2-inch thickness across all parallels in the set
• Parallelism accuracy held to 0.0003 inch for reliable, repeatable setups
• 52-58 RC hardness for long service life and resistance to nicking and wear
• Two drilled holes in each parallel for easy removal from vise jaws with a punch or pin
• Furnished in a fitted case for organized storage and protection

Compatibility

Designed as a general-purpose parallel set compatible with standard milling vises, magnetic chucks, and fixture plates in typical machine shop and toolroom applications.

Installation Notes

Parallels should be placed on clean, burr-free vise jaws or chuck surfaces before seating the workpiece to ensure accurate height transfer. Inspect mating surfaces and remove any chips or debris prior to use, as contamination will affect setup accuracy. No power tools are required for setup; standard hand tools and a pin punch for removal are typical. Parallels should not be used as cutting guides or subjected to direct tool contact, as this can compromise their ground surfaces and parallelism tolerances.