Spi 51-857-1 Center Square 3 Inches Spring Steel

Product Description

The SPI 51-857-1 is a center square layout tool used to locate the center of round or square stock quickly and accurately. The blade measures 3 inches in length and is constructed from spring steel, providing durability and resistance to flexing during use. This tool is a staple in machine shops, fabrication facilities, and maintenance environments where accurate center-finding is required on shafts, bars, and cylindrical workpieces. Machinists, pipefitters, and maintenance technicians use center squares as part of standard layout and marking operations.

The SPI 51-857-1 suits typical bench and floor work in industrial and light manufacturing settings. It is well suited for layout tasks on round bar stock, pipe ends, and similar cylindrical material where finding center before drilling, turning, or welding is necessary. The compact 3-inch blade size makes it practical for smaller diameter workpieces and confined layout areas.

Key Features

• 3-inch blade length for compact, precise center-finding on smaller stock
• Spring steel construction resists flex and wear under repeated use
• Compatible with round, square, and hex stock for versatile layout applications
• Single-piece layout — no assembly required
• Lightweight at 0.8 pounds for easy one-hand use at the bench

Compatibility

Designed as a standard center square for use in machine shop, fabrication, and maintenance layout operations on cylindrical and square stock.

Installation Notes

Center squares are hand tools and require no installation. Position the tool against the workpiece and scribe along the blade edge to mark center lines. For accurate results, take two scribe lines at different orientations and mark the intersection as center. Keep the blade clean and free of burrs to maintain scribing accuracy.