01F516 - Walter SST+ 1/4-Inch x 6-Inch Extension Drill Bit

Industrial Grade Reach and Precision

The Walter 01F516 SST+ Extension Drill Bit is engineered for maintenance, repair, and operations (MRO) professionals who demand reliability and performance in challenging drilling applications. Measuring 6 inches in total length with a 1/4-inch diameter, this tool is specifically designed to bridge the gap when standard jobber-length bits fall short. Whether you are drilling through thick structural beams, accessing recessed bolt holes, or navigating complex machinery assemblies, the extended reach of this bit ensures you can complete the task without disassembling surrounding components.

At the core of this drill bit is Walter’s proprietary SST+ technology. Manufactured from premium High-Speed Steel (HSS) containing a specific blend of cobalt and other alloys, it is further enhanced with a bronze surface treatment. This specialized coating significantly reduces friction and heat buildup during operation, which is critical when drilling deep holes where coolant access may be limited. The reduction in thermal stress preserves the cutting edge, extending the tool's life far beyond standard black oxide bits. For industrial users, this translates to fewer tool changes, reduced downtime, and a lower cost per hole.

The geometry of the 01F516 is built for efficiency. It features a 135° split point that self-centers immediately upon contact with the workpiece. This eliminates the need for center punching and prevents the bit from "walking" across the surface, ensuring precise hole placement every time. The heavy-duty flute design is optimized to evacuate chips effectively, even from deep channels, preventing clogging and binding that can lead to bit breakage. Suitable for use on mild steel, stainless steel, and aluminum, this extension bit is a versatile addition to any industrial tool crib.