The Walter 01H117 17\/64″ Hex SST Stub Drill represents a pinnacle in drilling geometry and metallurgical treatment, specifically engineered for the rigors of industrial fabrication. Designed with a heavy-duty stub length (often referred to as screw machine length), this tool offers significantly higher rigidity compared to standard jobber length bits. This increased stiffness minimizes deflection and runout, ensuring that holes are drilled concentric and true, even under substantial feed pressure. For professionals working with thin-walled materials or sheet metal, this rigidity is crucial for preventing ovaling and ensuring tight tolerance fit-ups.<\/p>\n
At the core of its performance is the 135\u00b0 split point geometry. Unlike standard 118\u00b0 points, the 135\u00b0 split point is self-centering, effectively eliminating the “walking” phenomenon often encountered when starting holes on smooth or curved surfaces. This feature negates the necessity for center punching, thereby streamlining the workflow and reducing cycle times in high-volume operations. The aggressive cutting angle also reduces the axial thrust required to penetrate the workpiece, reducing operator fatigue and machine wear.<\/p>\n
The drill bit is finished with Walter’s proprietary bronze SST surface treatment. This specialized coating serves a dual purpose: it enhances the surface hardness of the high-speed steel substrate and provides a lubricious layer that significantly reduces friction during the cutting action. This reduction in friction is paramount when drilling work-hardening alloys like stainless steel, as it helps dissipate heat and prevents chip welding. The result is a cutting tool that maintains its edge longer, delivers cleaner holes with minimal burrs, and performs reliably across a spectrum of materials including mild steel, stainless steel, and non-ferrous alloys.<\/p>\n
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