01C521 - Walter SST+ Letter U Cobalt Drill Bit 0.3680"

High-Performance Drilling with Walter SST+ Letter "U" Bits

The Walter 01C521 Letter "U" SST+ Drill Bit represents the pinnacle of drilling technology for industrial maintenance and fabrication. Designed by Walter Surface Technologies, this bit is engineered to solve the common frustrations associated with drilling tough metals like stainless steel and heavy-gauge mild steel. At the core of its performance is a premium cobalt blend material. Unlike standard high-speed steel (HSS) bits that can soften and dull quickly under high heat, the cobalt composition of the SST+ series maintains its hardness even at elevated temperatures, ensuring a sharp cutting edge for significantly longer periods.

One of the standout features of this drill bit is the exclusive "Speed Tip." This self-centering point geometry allows operators to start holes with pinpoint accuracy without the need for a center punch or pilot hole. This is particularly advantageous when working on curved surfaces, such as pipes or round stock, where standard bits tend to "walk" or wander before biting into the material. The Letter "U" size corresponds to a diameter of 0.3680 inches, making it a critical tool for specific tapping or clearance hole applications in precision assembly.

Efficiency is further enhanced by the unique "High Flow" flute design. Effective chip evacuation is crucial when drilling deep holes or working with materials that work-harden, like stainless steel. The SST+ flute geometry rapidly channels chips away from the cutting zone, preventing heat buildup and reducing the risk of the bit binding or snapping. Combined with a special bronze SST surface treatment that reduces friction, this bit delivers a smooth, fast drilling action that reduces operator fatigue and machine wear. Whether used in a portable hand drill or a stationary drill press, the Walter 01C521 delivers consistent, heavy-duty performance.

Key Industrial Benefits

• Extended Tool Life: Cobalt blend and bronze treatment resist heat and wear.
• Precision Starts: Self-centering tip eliminates walking on round parts.
• Versatile Application: Excellent for stainless steel, mild steel, and non-ferrous metals.
• Jam-Free Drilling: Back tapered body and high-flow flutes prevent binding.