01W951 - Walter SST+ Multi-Step Drill Bit Set - 3 Piece AlCrN Coated

High-Performance Multi-Step Drilling Solution

The Walter Surface Technologies 01W951 Multi-Step Drill Set represents the pinnacle of hole-making efficiency for industrial maintenance and fabrication. Designed to tackle the unique challenges of drilling thin gauge materials, this set utilizes advanced metallurgy and coating technologies to deliver precise, burr-free holes without the deformation often caused by standard twist drills. The core of this performance lies in the special bronze SST heat and surface treatment, which conditions the high-speed steel substrate to withstand the rigors of continuous use in hard metals.

What sets this drill set apart is the application of an AlCrN (Aluminum Chromium Nitride) coating. Unlike basic black oxide or standard titanium coatings, AlCrN provides exceptional oxidation resistance and hot hardness. This is particularly critical when drilling stainless steel, where friction heat can rapidly dull cutting edges. The coating acts as a thermal barrier, directing heat away from the tool and into the chip, thereby significantly prolonging the service life of the bit. This makes the 01W951 an essential asset for MRO environments where tool longevity and reliability directly impact downtime.

Operational stability is ensured through a thoughtful geometric design. Each bit features two wide, cylindrical flutes that efficiently evacuate chips, preventing build-up that can lead to binding or overheating. The shank is engineered with three flats, a crucial feature for high-torque applications, ensuring the bit remains positively locked in the chuck without slipping. This set includes three essential sizes covering a vast range of hole diameters from 1/8-inch up to 1-3/8-inch, making it a versatile solution for electrical panels, HVAC ducting, and automotive bodywork.

Key Technical Benefits

• Advanced Coating: AlCrN coating outperforms TiN in high-temperature applications.
• Vibration Control: Geometry designed to minimize chatter and distortion in sheet metal.
• Secure Mounting: 3-flat shank eliminates chuck slippage.