Starrett 51450 Four Face Parallel Tool Steel 6x1x0.25in

Product Description

The STARRETT 51450 is a four face parallel machined from a special grade of tool steel, designed for precision setup and inspection work in machine shops and toolrooms. All four faces are accurately ground to close limits, providing consistent reference surfaces for layout, milling, grinding, and measurement applications. The parallel measures 6 inches in length, 1 inch in height, and 0.25 inch in thickness. Squareness is held to 0.0005 inches per 1 inch, making this part suitable for demanding tolerances. It is sold and used as a matched pair. Machinists, toolmakers, and precision grinders are the primary installers and users of this type of tooling component.

Four face parallels like the STARRETT 51450 are used in machine shop environments where workpiece setup, fixture building, and surface plate inspection require ground reference surfaces on all four sides. Common applications include supporting workpieces on magnetic chucks, setting cutter heights, and establishing reference planes during milling or grinding operations. The matched pair configuration allows technicians to support parallel setups simultaneously on both sides of a workpiece, maintaining consistent height and squareness across the setup.

Key Features

• All four faces precision ground to close limits for reliable reference on any orientation
• Manufactured from a special grade of tool steel for durability and wear resistance
• Squareness tolerance of 0.0005 inches per 1 inch for high-precision setups
• Sold as a matched pair for balanced workpiece support
• Consistent 6 inch length supports a wide range of workpiece and fixture sizes

Compatibility

Designed as a general-purpose precision toolroom parallel suitable for use on surface plates, magnetic chucks, and machine tool fixtures where a four-face ground reference surface is required.

Installation Notes

Parallels should be handled with care to avoid nicks or surface damage that would affect ground reference faces. Clean contact surfaces and the parallel itself before use to prevent measurement error from chips or debris. No power lockout is required, but proper machine guarding and workholding practices should be followed per applicable shop safety standards when used in conjunction with machine tools.