Fowler 52-426-004-0 Tool Steel Square 4 Inch Blade

Product Description

The FOWLER 52-426-004-0 is a solid tool steel machinist square designed for layout and measurement work requiring accurate right-angle reference. The blade measures 4 inches in length and the base measures 3 inches, providing a compact and rigid inspection tool suited for workbench and machine-side use. A beveled edge on the blade allows the square to seat cleanly against a workpiece for precise line scribe and gap-light checking. Accuracy is rated at 0.0001 inches, making this square appropriate for close-tolerance fitting and inspection tasks. The matte finish reduces glare under shop lighting. Machinists, tool-and-die technicians, and precision fabricators are the primary users of this type of square.

This square is built for layout and measurement applications across machine shops, fabrication environments, and tool rooms. The compact 4-inch blade and 3-inch base combination suits part inspection, setup verification, and scribing tasks on smaller workpieces. The tool steel construction holds calibration under repeated shop use and resists wear against metal workpiece edges. It is appropriate for both bench-level quality checks and setup tasks at mills, lathes, and surface plates.

Key Features

• 4 inch blade length for compact right-angle reference on smaller workpieces
• 3 inch base length provides stable footing against workpiece edges
• 0.0001 inch accuracy rating for close-tolerance layout and inspection
• Beveled blade edge allows clean seating and gap-light inspection technique
• Tool steel construction resists wear and holds calibration in shop conditions
• Matte finish reduces glare for accurate visual alignment

Compatibility

Designed as a standard precision square for layout and measurement work across general machining, fabrication, and inspection applications.

Installation Notes

Machinists and precision layout technicians handle this tool as part of setup and inspection routines. No power source or fasteners are required. Keep the blade and base surfaces clean and free of chips or burrs before referencing against a workpiece to avoid false readings. Store the square in a protected case or dedicated slot to prevent damage to the ground surfaces and maintain accuracy between uses.