Hertel SDD43274992 Step Drill Bit Set 3 Pc Cobalt

Product Description

The HERTEL SDD43274992 is a 3-piece cobalt step drill bit set designed for drilling clean, accurate stepped holes in metal, sheet stock, and other hard materials. Built from cobalt high-speed steel, these bits resist heat and wear at higher cutting speeds than standard HSS tooling. The 118-degree split-point tip reduces walking on entry and cuts aggressively without requiring a center punch on most workpieces. The bright uncoated finish keeps the cutting edges visible during use and simplifies regrinding. This set covers a range from 1/8 inch minimum drill bit size up to 3/4 inch maximum hole size, making it a compact solution for machinists, maintenance techs, and fabricators who need stepped holes in a single pass.

Step drill bits from this set are suited to sheet metal fabrication, electrical panel work, conduit knockout drilling, HVAC ductwork, and general maintenance applications. The inch-measurement sizing and DIN specification designation make these bits compatible with standard inch-system chucks and drill presses found in most trade and light industrial environments. The 3-piece configuration allows technicians to keep a dedicated set staged at the job without pulling from a larger set.

Key Features

• Cobalt tool material for extended heat resistance and wear life in metals
• 118-degree split-point tip reduces bit walking and improves bite on entry
• Bright uncoated finish allows easy inspection and supports regrinding
• Covers 1/8 inch to 3/4 inch hole sizes in a single stepped bit profile
• DIN specification designation for consistent geometry and sizing
• 3-piece set provides redundancy and range for field or shop use

Compatibility

Designed for use in standard inch-system drill chucks, drill presses, and hand drills sized to accept step drill bit shanks in the 1/8 inch to 3/4 inch working range.

Installation Notes

Step drill bits are installed and removed by qualified machinists, electricians, or maintenance technicians using a standard keyed or keyless chuck. Ensure the drill or drill press is fully powered down and the chuck is secured before beginning any operation. Use appropriate cutting fluid or lubricant when drilling ferrous metals to reduce heat buildup and extend bit life. Eye protection and gloves are required per standard shop safety practice.