Hertel SDD43275031 Step Drill Bit Set 3 Pc Cobalt

Product Description

The HERTEL SDD43275031 is a 3-piece cobalt step drill bit set designed for drilling clean, progressive holes through metal and other hard materials. Manufactured from cobalt high-speed steel, these bits offer superior heat and wear resistance compared to standard HSS tooling. The split-point tip geometry at 118 degrees eliminates walking on contact, allowing the bit to cut immediately without center-punching. This set is suited for metalworking professionals, maintenance mechanics, and industrial tradespeople who require reliable step drilling in demanding production or field environments. The set weighs 0.63 pounds and conforms to DIN specification standards.

Step drill bits in this set are sized for inch-system applications, with a maximum drill bit size of 30 inches as noted in the specification data. These bits are commonly used for enlarging existing holes, deburring, and creating multiple hole sizes with a single tool. Typical applications include sheet metal fabrication, electrical enclosure work, HVAC panel knockout operations, and mechanical assembly tasks where a progression of hole sizes is needed without a full bit change. The cobalt construction makes them appropriate for stainless steel, hardened steel, and high-alloy materials that would quickly degrade standard carbon or HSS bits.

Key Features

• Cobalt high-speed steel construction for heat resistance and extended tool life in hard metals
• Split-point tip at 118 degrees for immediate cutting engagement and reduced walking
• Step drill geometry produces multiple hole sizes with a single bit
• Bright/uncoated finish — no coating to chip or peel under heavy use
• Conforms to DIN specification for consistent dimensional accuracy
• 3-piece set covering a range of step sizes in the inch measurement system

Compatibility

Designed as an OEM-style step drill bit set for use in standard drill chucks and drill presses accepting inch-system step drill bits across metalworking and industrial maintenance applications.

Installation Notes

Step drill bits are installed and operated by machinists, maintenance mechanics, and trade professionals using handheld drills or drill presses. Secure the workpiece before drilling and use appropriate cutting fluid when drilling through hardened or stainless steel to extend bit life and prevent overheating. Do not exceed the recommended RPM for the material and bit diameter being used. Inspect the cutting edges before each use and replace any bit showing chipping or heat discoloration.