Starrett 51449 Four Face Tool Steel Parallel 6x3/4x1/4 in

Product Description

The STARRETT 51449 is a four-face precision parallel machined from a special grade of tool steel and sold as a matched pair. All four faces are accurately ground to close limits, giving machinists and tool-and-die professionals a reliable reference surface for setup work, inspection, and milling operations. The parallel measures 6 inches in length, 3/4 inches in height, and 1/4 inches in thickness. Squareness is held to 0.0005 inches per 1 inch, making these parallels suitable for close-tolerance work where consistent, repeatable setups are required.

Four-face parallels are used in machine shops, tool rooms, and precision metalworking environments. They serve as spacers and support elements when setting up vises, fixtures, and surface plates. The matched-pair format ensures both pieces are ground to the same dimensions, which is essential when workpieces need to be supported at identical heights on both sides. Typical users include machinists, tool makers, and quality-control technicians working in job shops and production environments.

Key Features

• All four faces precision ground to close limits for consistent contact and reference accuracy
• Squareness tolerance of 0.0005 inches per 1 inch
• Manufactured from a special grade of tool steel for hardness and dimensional stability
• Sold as a matched pair for symmetrical workholding and setup applications
• Compact 1/4-inch thickness fits narrow vise openings and tight fixture slots

Compatibility

Designed as an OEM-style precision parallel suitable for use with standard machinist vises, surface plates, and milling machine fixtures in tool-room and production-shop applications.

Installation Notes

Parallels are placed and removed by hand during machine setup; no power tools are required. Always clean contact surfaces and the vise or fixture bed before placing parallels to prevent debris from affecting height consistency. Store parallels in a protective case or on a padded surface to avoid nicks that could compromise ground faces. Inspection and setup work should follow applicable shop standards for gauge and reference-tool handling.