Starrett 56361 4 Inch Combination Square Set 3 Piece

Product Description

The STARRETT 56361 is a 3-piece combination square set built for layout, inspection, and measurement tasks in trade and shop environments. The set includes a 4-inch steel blade and a cast iron center square head, providing rigid, accurate reference surfaces for scribing, checking 90-degree and 45-degree angles, and locating center points. The blade graduates in 4R style, covering 1/64, 1/32, 1/16, and 1/8 inch increments for fine-resolution measurement. Machinists, pipefitters, fabricators, and sheet metal workers rely on combination square sets like this one for consistent, repeatable layout work on the bench or in the field.

This set is suited for residential and light commercial trade applications where compact blade length is an advantage, such as tight-clearance layout work, cabinet and millwork fitting, or mechanical system component fabrication. The 4-inch blade length makes the 56361 practical when a full 12-inch square is too large for the work surface. The center square head allows quick, accurate center-finding on round stock, a common task in plumbing and mechanical fitting work.

Key Features

• 3-piece set includes steel blade and cast iron center square head
• 4-inch blade length suited for compact layout tasks
• 4R graduation style: 1/64, 1/32, 1/16, and 1/8 inch increments
• Cast iron head provides stable, wear-resistant reference surface
• Center square head enables fast center-finding on cylindrical stock
• Compact format fits in a tool pouch or toolbox tray

Compatibility

Designed as a standard combination square set compatible with general layout and inspection tasks across machining, fabrication, plumbing, and mechanical trades.

Installation Notes

No installation is required for this measuring tool. Before use, verify the blade is seated and locked securely in the head to prevent measurement error. Keep blade and head surfaces clean and free of burrs or debris that could affect squareness accuracy. Store in a dry location to protect the cast iron head from corrosion.