01H020 - Walter 5/16 Inch SST Heavy-Duty Stub Drill Bit

High-Performance Rigidity for Industrial Drilling

The Walter 5/16" SST Stub Drill (SKU: 01H020) represents a pinnacle in drilling efficiency for industrial environments requiring precision and durability. Unlike standard jobber-length bits, this stub drill—often referred to as screw machine length—is engineered with a shorter overall length and flute geometry. This design choice is not merely for fitting into tight spaces; it fundamentally alters the tool's mechanics. The reduced length significantly increases the torsional rigidity of the bit, drastically minimizing the deflection and vibration that typically lead to tool breakage. For maintenance, repair, and operations (MRO) professionals, this translates to fewer snapped bits, reduced downtime, and lower consumable costs over time.

At the cutting tip, the drill features a sophisticated 135° split point. This geometry is critical for modern fabrication, as it allows the drill to bite into the material immediately upon contact. It effectively eliminates the "walking" phenomenon common with standard 118° points, thereby removing the necessity for pre-drilling center punches. This self-centering capability is particularly advantageous when working with hard, slick surfaces like stainless steel or curved surfaces on pipes and tubing.

The performance of the 01H020 is further enhanced by Walter's proprietary SST surface treatment. This special bronze-colored coating is not just aesthetic; it serves a functional purpose by reducing the coefficient of friction between the tool and the workpiece. Lower friction means less heat generation—the primary enemy of cutting tool life. By keeping the cutting edge cooler, the SST treatment preserves the temper of the high-speed steel, allowing for faster drilling speeds and cleaner holes, especially in thin-walled materials and sheet metal applications.

Key Industrial Benefits:

• Enhanced Durability: The stub design resists snapping under heavy feed pressure.
• Precision Starting: 135° split point ensures accuracy without pilot holes.
• Heat Management: Bronze SST coating evacuates chips and reduces thermal stress.