01D535 - Walter SST+ 3.5mm Cobalt Drill Bit for Stainless Steel

Precision Engineering for Tough Materials

The Walter Surface Technologies 01D535 SST+ 3.5mm Drill Bit represents the pinnacle of drilling performance for industrial applications. Designed to meet the rigorous demands of metal fabrication, this drill bit is crafted from a specialized cobalt blend that provides exceptional hardness and heat resistance. This material composition is critical when working with high-tensile metals, as it maintains the cutting edge's integrity even under high thermal stress. The SST+ series is renowned for its ability to drill more holes faster, significantly reducing downtime associated with bit changes and sharpening.

One of the standout features of this 3.5mm bit is its 135° split point geometry. Unlike standard drill bits that require a center punch to start, the SST+ split point is self-centering. It bites into the material immediately upon contact, eliminating the tendency to "walk" or wander across the surface. This precision is vital when drilling on curved surfaces or when exact hole placement is required. Furthermore, the bit features a unique "High Flow" flute design. This geometry is optimized to evacuate chips rapidly from the hole, preventing chip packing and heat buildup—two common causes of premature bit failure in stainless steel applications.

Durability is further enhanced by Walter's proprietary bronze SST surface treatment. This treatment acts as a lubricant and a protective layer, reducing friction between the bit and the workpiece. Combined with a back-tapered body design that minimizes contact with the hole walls, the 01D535 reduces torque requirements and prevents binding. Whether utilized in a stationary drill press or a portable hand drill, this tool delivers consistent, clean, and accurate holes in mild steel, stainless steel, and non-ferrous alloys.