Hertel SDD43274836 Step Drill Bit 14 Sizes 4-30mm Hss Tin

Product Description

The HERTEL SDD43274836 is a high-speed steel step drill bit designed to drill and ream multiple hole sizes with a single tool. It produces 14 stepped hole diameters ranging from 4 mm to 30 mm, advancing in 5 mm increments per step. The shank measures 10 mm in diameter and features a round-with-flats design with three flats for secure chuck engagement and reduced slippage during operation. A titanium nitride (TiN) coating increases surface hardness and reduces friction, extending cutting life in ferrous and non-ferrous sheet materials. The tool weighs 0.44 pounds. Metal fabricators, electricians, and HVAC technicians typically use this type of bit for sheet metal, electrical enclosures, and panel work.

This step drill bit is suited for use in sheet metal, thin steel panels, aluminum, and plastic sheet materials where clean, burr-free holes of multiple diameters are required from a single tool. It is commonly used in electrical rough-in work for conduit knockouts, HVAC ductwork penetrations, and light fabrication tasks. The stepped geometry allows the operator to drill a range of hole sizes without a bit change, which reduces setup time on the job. The three-flat shank is compatible with standard keyless and keyed drill chucks.

Key Features

• 14 hole sizes in one bit, ranging from 4 mm to 30 mm minimum to maximum diameter
• 5 mm step length per increment for controlled, predictable sizing
• High-speed steel construction for durability in ferrous and non-ferrous materials
• Titanium nitride (TiN) coating for increased wear resistance and reduced heat buildup
• 10 mm round-with-flats shank with three flats prevents chuck slippage
• Single-tool solution reduces the need for multiple twist or hole-saw bits on the job

Compatibility

Designed for use in standard drill chucks accepting a 10 mm round-with-flats shank; suitable for hand-held drills and drill presses used in sheet metal, electrical panel, and light fabrication applications.

Installation Notes

Installation of this bit is performed by electricians, HVAC technicians, sheet metal workers, and general fabricators. Secure the three-flat shank firmly in the chuck before operation to prevent rotation or pullout. Use appropriate cutting fluid or lubricant when drilling ferrous materials to preserve coating life and reduce heat. Always wear eye protection and secure the workpiece before drilling.