01B529 - Walter SST+ #29 Cobalt Jobber Drill Bit for Stainless & Steel

Technical Overview of the Walter SST+ Jobber Drill

The Walter SST+ Jobber Drill Bit (SKU: 01B529) represents a significant advancement in tooling geometry and material science, specifically engineered for the rigorous demands of industrial metalworking. This #29 size bit is manufactured from a proprietary cobalt blend, a high-speed steel formulation designed to maintain hardness at elevated temperatures (red hardness). This material composition is critical when drilling materials with high tensile strength, such as stainless steel, where friction-generated heat can rapidly degrade standard HSS bits.

A defining feature of the SST+ series is the exclusive "Speed Tip." This geometry functions similarly to a split point but is optimized to reduce the axial thrust force required to initiate the cut. By self-centering immediately upon contact with the workpiece, the Speed Tip eliminates the phenomenon of "walking," thereby removing the necessity for pre-drilling center punches. This ensures precise hole placement and reduces cycle times in production environments.

Chip evacuation is managed through a "High Flow" flute design. In deep hole drilling, chip packing is a primary cause of tool failure and poor surface finish. The SST+ flutes are engineered to rapidly channel swarf away from the cutting edge, preventing heat localization. Furthermore, the bit features a back-tapered body. This subtle reduction in diameter from the tip to the shank reduces surface contact between the tool body and the hole wall, significantly mitigating friction and the risk of binding.

The tool is finished with a bronze SST surface treatment. This coating serves a dual purpose: it enhances lubricity to further reduce friction during the cut, and it acts as a thermal barrier. The combination of the cobalt blend substrate, advanced tip geometry, and specialized surface treatment results in a drill bit that delivers exceptional performance, longevity, and dimensional accuracy in mild steel, non-ferrous metals, and particularly stainless steel applications.