01J030 - Walter #30 Cobalt Stub Drill Bit for Stainless Steel

High-Performance Drilling for Industrial Fabrication

The Walter 01J030 #30 SST Stub Drill represents the pinnacle of drilling technology for industrial maintenance and fabrication. Designed to address the common failure points of standard jobber-length bits, this stub drill (also known as screw machine length) features a significantly shorter flute and overall length. This compact geometry drastically increases the torsional rigidity of the bit, making it nearly impossible to snap under normal working conditions. For professionals working with thin-gauge sheet metal or performing repetitive drilling tasks in tough alloys, this structural integrity translates to lower consumable costs and less downtime caused by broken tooling.

At the core of the 01J030 is a proprietary cobalt blend high-speed steel. Unlike standard black oxide bits that soften rapidly under heat, this cobalt formulation maintains its hardness at elevated temperatures, making it the superior choice for drilling stainless steel and other high-tensile materials. The bit is finished with Walter’s exclusive Bronze SST surface treatment, a specialized coating that promotes chip evacuation and reduces friction. This treatment prevents the common issue of "chip welding," where hot metal fuses to the cutting edge, dulling the tool prematurely.

Precision is paramount in MRO environments. The 135-degree split point on this #30 drill bit is engineered to self-center immediately upon contact with the workpiece. This eliminates the need for center punching and prevents the bit from "walking" or skating across the surface, which is critical when drilling into rounded surfaces or polished sheets where cosmetic damage must be avoided. Whether used in a stationary drill press or a portable hand drill, the Walter SST Stub Drill delivers clean, round holes with exceptional efficiency.

Key Industrial Benefits

• Maximum Rigidity: Short flute design resists bending and breaking, even under heavy feed pressure.
• Heat Resistance: Cobalt blend substrate survives the high temperatures generated when drilling stainless steel.
• Efficiency: Split point geometry allows for faster penetration rates with less operator force required.