EXACT High Speed Steel Step Drill Bit, 4 to 12 mm Range, Hex Shank, Titanium Aluminium Nitride Finish, 4407022

The EXACT 4407022 Step Drill Bit is an industrial-grade tool engineered to meet the needs of metalworking professionals requiring accurate, burr-free holes in sheet metal, pipes, and profiles. This step drill bit covers a 4 to 12 mm diameter range, making it versatile for applications in electrical panels, HVAC ducting, construction, and equipment manufacturing.

Constructed from premium high speed steel (HSS), it offers excellent toughness and extends cutting life, even when used on particularly hard materials. The bit features an advanced Titanium Aluminium Nitride (TiAlN) coating, which improves heat resistance, minimizes friction, and increases operational lifespan during repetitive use in aggressive environments.

Its hexagonal shank design ensures a reliable, slip-resistant fit in drill chucks, reducing the risk of bit rotation under heavy load. The spiral flute geometry, combined with an integrated deburring zone, delivers a smooth, burr-free finish and enables two-sided deburring in a single operation. The tool eliminates the need for centre-punching, as it efficiently starts drilling without walking to the sides, ensuring high positional accuracy from the outset.

Throughout operation, the bit maintains a consistent cutting angle, supporting both precision and repeatability for critical tasks. This makes it ideal for metalworking shops, industrial assembly lines, maintenance facilities, and specialized HVAC installations.

The diameter specification is laser marked on each progressive step for quick and accurate size identification. The robust three-faced (tri-flat) driving shaft design prevents the bit from slipping inside the drill chuck, even during high-torque applications.

This tool is suitable for use on construction steel, CrNi stainless steels, and non-ferrous metals, provided the material thickness does not exceed 6 mm. Its advanced features are tailored to provide reliability, quality, and safety for demanding professional environments.

Industrial application areas include electrical enclosure manufacturing, metal fabrication, automotive body and assembly, HVAC duct cutouts, and other industrial or laboratory metal drilling tasks. For more top-quality drilling solutions from EXACT, continue exploring the Drill Bit category on EnvMart.