01K012 - Walter 3/16 Inch SST Plus Cobalt Double-Ended Stub Drill Bit

Technical Precision: Walter 3/16" SST+ Cobalt Stub Drill

The Walter 01K012 represents the pinnacle of drilling geometry for thin-gauge applications. This 3/16-inch double-ended stub drill bit incorporates Walter's advanced SST+ geometry, designed to optimize chip removal and cutting speed in materials where precision and finish are critical. Unlike general-purpose jobber drills, this stub bit is engineered to provide maximum stiffness, ensuring hole concentricity and eliminating the "wobble" often experienced with portable power tools.

At the core of this bit's performance is its Cobalt HSS alloy substrate. The addition of cobalt to the high-speed steel matrix increases the red hardness of the tool, allowing it to withstand the high temperatures generated at the cutting interface without losing its temper. This is essential when drilling materials with high tensile strength or work-hardening properties, such as certain grades of stainless steel. The bit is finished with a specialized bronze-colored SST surface treatment that acts as a solid lubricant, reducing the coefficient of friction and preventing material adhesion (galling) on the cutting lips.

The High Flow flute design is another critical engineering feature. It is specifically contoured to evacuate chips rapidly from the hole, preventing clogging and heat buildup. This is complemented by a self-centering split point (typically 135 degrees for this class of tool), which penetrates the material surface immediately upon contact. This eliminates the need for a center punch and prevents the bit from "walking" across the workpiece, ensuring that every hole is positioned exactly where intended.

This drill bit is the tool of choice for professionals requiring high-tolerance holes in sheet metal, thin-wall tubing, and structural shapes. Its robust design ensures minimal burr formation on the exit side of the hole, reducing secondary deburring operations and streamlining the workflow.

Technical Specifications

• Substrate: Cobalt High-Speed Steel (HSS)
• Geometry: Double-Ended Stub with High Flow Flutes
• Point: Self-Centering (No center punch required)
• Surface: SST Low-Friction Treatment