01B528 - Walter SST+ Cobalt Jobber Drill Bit, Wire Gauge #28

High-Performance Drilling with Walter SST+ Technology

The Walter 01B528 SST+ Jobber Drill Bit (Size #28) represents the pinnacle of drilling technology for industrial applications. Designed by Walter Surface Technologies, this bit is engineered to tackle the toughest materials found in modern fabrication shops, including stainless steel, mild steel, and non-ferrous alloys. At the core of its performance is a proprietary cobalt blend substrate. Unlike standard high-speed steel (HSS) bits that soften under high temperatures, the cobalt additive in the SST+ series maintains hardness even when drilling generates significant frictional heat. This thermal stability allows for higher drilling speeds and significantly extends the lifespan of the cutting edge.

Precision is paramount in professional machining and maintenance. The 01B528 features Walter's exclusive "Speed Tip" design. This self-centering geometry eliminates the common issue of "walking"—where the bit wanders across the workpiece before penetrating—thereby removing the need for pre-punching a center mark. This feature alone saves valuable time during repetitive drilling tasks. Furthermore, the bit incorporates a "high flow" flute design. This geometry is optimized to evacuate chips rapidly from the hole, preventing clogging and further reducing heat buildup, which is the primary cause of premature bit failure.

Durability is enhanced by the unique bronze SST surface treatment, which acts as a lubricant to reduce friction between the bit and the workpiece. Additionally, the body of the drill bit is back-tapered. This subtle engineering choice ensures that only the cutting tip makes full contact with the material, minimizing sidewall friction and preventing the bit from binding or snapping inside deep holes. For professionals requiring reliable, precise, and long-lasting tooling, the Walter SST+ #28 drill bit is the definitive choice.