Starrett 51452 Four Face Tool Steel Parallel 6 X 3/4 X 3/8 in

Product Description

The STARRETT 51452 is a four-face precision parallel machined from a special grade of tool steel. All four faces are accurately ground to close limits, providing reliable reference surfaces for setup, inspection, and layout work in machine shops and tool rooms. The parallel measures 6 inches long, 3/4 inch high, and 3/8 inch thick, with a squareness tolerance of 0.0005 inches per 1 inch. Sold as a matched pair, the 51452 is used by machinists, toolmakers, and metrologists who require consistent, repeatable workholding and inspection references.

Four-face parallels are a standard tool in precision machining environments. They are used on surface plates, in milling vises, on grinders, and in inspection fixtures where flat, square reference surfaces are critical. The matched-pair format allows the user to support workpieces at uniform height on both sides of a vise or fixture. This size range suits general-purpose milling, grinding, and inspection setups in both job-shop and production environments.

Key Features

• All four faces precision ground to close tolerances for consistent reference surfaces
• Squareness of 0.0005 inches per 1 inch
• Manufactured from a special grade of tool steel for durability and stability
• Sold as a matched pair for balanced workpiece support
• Compact 6 inches x 3/4 inches x 3/8 inches profile suits a wide range of vise and fixture setups

Compatibility

Designed as a general-purpose precision parallel for use in machine shop vises, surface plate inspection setups, and grinding fixtures requiring a four-face ground reference standard.

Installation Notes

Parallels are placed, not fastened — clean the contact surfaces and remove burrs or chips before seating the parallel in a vise or on a surface plate. Handle ground surfaces with care to avoid nicks that would affect accuracy. Store parallels protected from moisture to prevent corrosion of the tool steel surfaces.