01J035 - Walter SST+ #35 Cobalt Stub Drill Bit

Precision Drilling with Walter SST Stub Drill Bits

The Walter #35 SST Stub Drill Bit (01J035) represents the pinnacle of drilling efficiency for industrial applications requiring high precision and durability. Engineered specifically for the challenges of drilling through sheet metal and hard alloys, this bit features a robust cobalt-blended High Speed Steel (HSS) composition. The addition of cobalt significantly enhances the bit's heat resistance, allowing it to maintain a sharp cutting edge even when subjected to the high temperatures generated by drilling stainless steel and other abrasive materials. This metallurgical advantage ensures a longer service life and reduces the frequency of tool changes in high-volume production environments.

One of the defining characteristics of this tool is its "stub" or screw machine length. Unlike standard jobber length bits, the stub design features shorter flutes and a shorter overall length. This geometry drastically increases the torsional rigidity of the bit, minimizing the risk of deflection and breakage. For operators using portable power tools, this rigidity provides superior control, ensuring that holes are drilled straight and true without the bit flexing or snapping under lateral pressure. This makes the Walter SST Stub Drill an indispensable asset for maintenance, repair, and fabrication tasks where stability is paramount.

Performance is further optimized by the 135° split point geometry. This aggressive point angle allows the bit to bite into the material immediately upon contact, effectively eliminating the "walking" or wandering often experienced with standard 118° points. As a result, the need for pre-drilling or center punching is removed, streamlining the workflow. The specialized bronze SST surface treatment acts as a lubricant and protective barrier, reducing friction between the tool and the workpiece. This coating promotes efficient chip evacuation and prevents material adhesion, ensuring a clean, burr-free finish on every hole.

Key Technical Benefits

• Enhanced Rigidity: Short flute design prevents flexing and breakage.
• Heat Resistance: Cobalt blend thrives in hard metals like stainless steel.
• Self-Centering: Split point design starts drilling on contact.
• Surface Treatment: Bronze finish reduces heat buildup and friction.