Magafor 81185040300 Combo Drill Countersink Size 4 Hss

Product Description

The MAGAFOR 81185040300 is a combination drill and countersink designed to drill a pilot hole and form a countersink in a single pass. Built from high-speed steel with a bright, uncoated finish, this tool handles both operations simultaneously, reducing setup time and tool changes on the bench or in the field. It features a 5/16-inch body diameter, a 1/8-inch drill point diameter, a 118-degree drill point angle, and a 60-degree included angle for the countersink profile. The 3-inch overall length qualifies it as a long-length tool, providing additional reach in confined or deep-access applications. Right-hand cutting direction. Series 185.

This combo drill countersink is suited for metalworking applications where a countersunk hole is required for flat-head fasteners. The plain cutting edge style and double end type extend tool life by allowing the operator to flip the tool when one end dulls. Typical applications include fabrication shops, maintenance and repair operations, and light manufacturing environments where precision countersinking in steel, aluminum, or similar materials is required. Licensed machinists, tool-and-die technicians, and experienced tradespeople are the primary users.

Key Features

• Combines drilling and countersinking into a single operation, eliminating a separate tool change
• High-speed steel construction provides durability across common metal substrates
• Double end design extends usable tool life
• 118-degree drill point angle suits general-purpose metal drilling
• 60-degree included angle produces a standard countersink profile for flat-head fasteners
• Long-length tool at 3 inches overall length for added reach

Compatibility

Designed as an OEM-style replacement or direct addition for Series 185 combo drill countersink applications requiring a size 4 trade size with a 5/16-inch body diameter and 1/8-inch drill point.

Installation Notes

This tool is installed in a drill press, milling machine, or hand drill with a compatible chuck accepting a 5/16-inch shank. Ensure the machine is powered down and the chuck is fully secured before beginning operation. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole quality. Verify spindle rotation is set to right-hand before engaging the workpiece.