M.a. Ford. 79B037503 Countersink 90 Deg 6 Flute Hss

Product Description

The M.A. FORD. 79B037503 is a single-end, 6-flute countersink designed for right-hand cutting in a wide range of materials. Built from high-speed steel (HSS) with a straight-cylindrical shank, it produces clean, accurate 90-degree countersunk seats for flathead fasteners. The tool has a maximum cutting diameter of 0.375 inches and an overall length of 2 inches, with a 0.25-inch straight shank that mounts directly into standard drill chucks or collet holders. The 6-flute geometry reduces chatter and delivers a smoother finish than lower-flute-count countersinks, making it a reliable choice for production and maintenance work alike.

This countersink is suited for use in machine shops, fabrication facilities, and maintenance environments where consistent 90-degree countersinks are required across varied workpiece materials. Its HSS construction supports use in both hand-held drilling setups and benchtop or floor drill presses. The straight shank accepts standard collets and chucks without adapters, keeping setup time low for repetitive countersinking operations.

Key Features

• 90-degree included angle for standard flathead fastener seating
• 6-flute design minimizes chatter and improves surface finish
• High-speed steel construction for durability across multiple material types
• Straight-cylindrical 0.25-inch shank fits standard chucks and collets
• Single-end configuration with 0.375-inch maximum cutting diameter
• Right-hand cutting direction compatible with standard drill press and hand-drill operation

Compatibility

Designed for countersinking operations in alloy steel, aluminum, brass, cast iron, high-nickel steel, high-tensile steel, magnesium, magnesium alloy, mild steel, Monel, plastic, and stainless steel workpieces.

Installation Notes

This tool is installed by machinists and maintenance technicians using standard drill chucks or collet holders sized for a 0.25-inch shank. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits to protect flute life. Power down the machine and lock out energy sources before changing tooling. Do not exceed the recommended spindle speeds for the workpiece material to avoid premature wear or tool failure.