01B509 - Walter SST+ #9 Cobalt Jobber Drill Bit for Stainless Steel

Technical Overview of the Walter SST+ #9 Jobber Drill Bit

The Walter 01B509 is a #9 size jobber length drill bit from the renowned SST+ series, engineered specifically to address the challenges of drilling through high-tensile strength materials. Manufactured from a proprietary cobalt blend high-speed steel (HSS), this tool is designed to withstand the extreme temperatures generated when machining stainless steel and other hard alloys. Unlike standard HSS bits which lose their temper and hardness at high temperatures, the cobalt matrix maintains structural integrity, significantly extending the service life of the cutting edge.

A defining feature of the SST+ line is the exclusive "Speed Tip" geometry. This advanced point design functions similarly to a 135-degree split point but is optimized to be fully self-centering. This eliminates the phenomenon of "walking" or "skating" when starting a hole, even on curved surfaces such as pipes or tubing, and negates the necessity for pre-drilling center punches. The precision of the tip ensures hole concentricity and accuracy from the very first rotation.

Chip evacuation is critical in deep hole drilling to prevent heat localization. The Walter SST+ features a "High Flow" flute geometry that rapidly channels swarf and chips away from the cutting zone. Coupled with a back-tapered body design, this tool minimizes surface contact between the bit's shank and the hole walls, thereby reducing friction and torque requirements. The bit is finished with a specialized bronze SST surface treatment, which further enhances lubricity and wear resistance. For industrial MRO operations requiring reliable, high-performance tooling for mild steel, non-ferrous metals, and particularly stainless steel, the 01B509 delivers measurable productivity gains.