01B521 - Walter SST+ Heavy Duty Cobalt Drill Bit, Wire Gauge #21

High-Performance Drilling with Walter SST+ Technology

The Walter SST+ Jobber Drill Bit (Size #21) represents the pinnacle of drilling technology for industrial applications. Engineered by Walter Surface Technologies, this bit is designed to tackle the most demanding materials found in modern fabrication shops, including stainless steel, mild steel, and various non-ferrous alloys. At the core of its performance is a proprietary cobalt blend substrate. Unlike standard High-Speed Steel (HSS) bits, the cobalt additive significantly increases the bit's hot hardness, allowing it to maintain a sharp cutting edge even under the extreme temperatures generated during aggressive drilling operations.

One of the standout features of the SST+ line is the exclusive self-centering "Speed Tip." This advanced point geometry eliminates the common frustration of bit walking, allowing operators to start holes with pinpoint accuracy without the need for a center punch or pilot hole. This feature alone drastically reduces setup time and improves overall workflow efficiency. Furthermore, the 135-degree split point design ensures aggressive engagement with the material, reducing the feed pressure required by the operator or the machine.

Chip evacuation is a critical factor in drill bit longevity, and the Walter 01B521 excels in this area with its "High Flow" flute design. The geometry of the flutes is optimized to pull chips away from the cutting zone rapidly, preventing heat buildup and chip packing that can lead to premature failure. Additionally, the back-tapered body design reduces surface contact between the bit and the hole walls, minimizing friction and preventing binding—a common issue when drilling deep holes in tough materials. Finished with a special bronze SST surface treatment, this drill bit offers reduced friction and enhanced wear resistance, making it a reliable choice for professionals who demand consistency and speed.

Whether used in a portable hand drill or a stationary drill press, the Walter SST+ #21 drill bit delivers clean, round holes with exceptional speed. It is the ideal solution for MRO professionals, fabricators, and machinists looking to optimize their drilling processes and reduce consumable costs through extended tool life.