400N122 - 11/32" Nitro Heavy Duty Jobber Drill Bit, 135° Split Point, M-7N HSS

Premium Industrial Drilling Performance

The Nitro 400N122 11/32" Heavy Duty Drill Bit represents the pinnacle of hole-making technology for industrial maintenance and fabrication environments. Part of the renowned 400N series, this tool is engineered to address the common failure points of standard high-speed steel bits when tasked with machining high-tensile materials. The foundation of its performance lies in the substrate: a premium grade of M-7N molybdenum high-speed steel. Unlike standard M-2 HSS, M-7N offers a superior balance of toughness and wear resistance, allowing the cutting edges to maintain their integrity even under high thermal loads.

Beyond the base material, the Nitro 400N122 undergoes a specialized Nitride surface treatment. This process case-hardens the exterior of the tool, creating a protective shell that is measurably harder than the core. This dual-hardness approach is critical; it provides the extreme surface hardness required to cut abrasive materials while retaining a ductile core that resists snapping under torque. The distinctive black and gold finish is not merely cosmetic; the gold surface treatment on the body and clearance areas reduces friction and improves lubricity, facilitating efficient chip evacuation and reducing heat buildup during deep drilling operations.

Geometric precision is equally prioritized in this USA-manufactured tool. The 135-degree split point design is specifically chosen for heavy-duty applications. Unlike standard 118-degree points that require a center punch to prevent walking, the split point engages the material immediately upon contact. This self-centering action reduces the axial thrust required by the operator or machine, minimizing fatigue and improving hole accuracy. With a flute length of 3-7/16 inches, this jobber-length bit offers sufficient reach for a wide variety of through-hole and blind-hole applications in structural steel, stainless steel, and other hard metal alloys.