Spi 51-856-3 Center Square 1.5 Inch Spring Steel

Product Description

The SPI 51-856-3 is a center square used to locate the center of round or cylindrical stock quickly and accurately. The tool works by placing the two legs of the square against the outside diameter of a workpiece and scribing a line along the blade. Repeating the process at a different angle reveals the true center point. The blade measures 1.5 inches in length and is manufactured from spring steel for durability and resistance to flex under repeated use. Machinists, tool-and-die workers, and fabricators rely on this type of layout tool when center-finding precision matters before drilling or turning operations.

This center square is suited for use in machine shops, fabrication shops, and maintenance environments where shaft or rod center-finding is a routine task. It is appropriate for residential and light commercial maintenance work as well as production environments. The compact 1.5-inch blade length makes it practical for smaller-diameter stock and confined layout tasks. Sold as a single unit, it is a standard addition to any precision layout tool kit.

Key Features

• Spring steel blade construction for flex resistance and long service life
• 1.5-inch blade length suited for small to mid-size cylindrical workpieces
• Locates center of round stock with two quick scribe lines
• Compact form factor for use in confined layout areas
• Single-piece unit requiring no assembly

Compatibility

Designed as a general-purpose center square for use with round and cylindrical stock in standard machinist and fabrication layout applications.

Installation Notes

No installation is required for this hand layout tool. Ensure the workpiece is secured before scribing to maintain accuracy. Keep the blade clean and free of burrs to preserve scribing performance. Handle spring steel blades with care to avoid bending beyond their elastic limit.