Norseman Drill & Tool Letter Sizes HD Super Premium NAS 907B Type 190-AG Jobber Length Twist Bit
Magnum Power for Precision Drilling
The Norseman Drill & Tool Letter Sizes HD Super Premium NAS 907B Type 190-AG Jobber Length Twist Bit is built for professionals who demand extreme strength, accuracy, and durability in tough drilling applications. As part of Norseman’s Magnum Super Premium Series, this American-made drill bit is engineered to outperform cobalt drills—especially in work-hardening stainless steel, titanium, Inconel, and other high-tensile alloys.
Engineered for Strength and Longevity
Constructed from premium high-molybdenum tool steel, the 190-AG drill bit undergoes Norseman’s proprietary nitro-carburizing surface treatment. This advanced process dramatically increases surface hardness, enhances lubricity, and improves wear resistance—allowing the bit to cut cooler, cleaner, and longer in demanding industrial environments.
A low-temperature stress relief treatment further improves toughness and reduces brittleness, resulting in smoother drilling, reduced friction, and superior chip evacuation. These engineered advantages make the 190-AG ideal for high-speed machining, fabrication, and precision drilling operations.
Aerospace-Grade Precision
Each bit is precision-ground to NAS 907B aerospace specifications, ensuring exceptional balance, tight tolerances, and consistent hole accuracy. The 135° split point provides fast, self-centering starts with minimal walking, reducing thrust pressure and allowing more control during drilling on hard or curved surfaces.
The durable black and gold oxide finish adds corrosion resistance and optimizes chip flow, delivering reliable, repeatable performance even in repetitive production drilling.
Key Features
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Built to NAS 907B aerospace-grade standards
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Nitro-carburized Magnum finish for superior hardness and lubricity
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Outperforms cobalt bits in stainless steel and hard alloys
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Low-temperature stress relief improves toughness and reduces friction
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135° split point for precise, walk-free starts
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Available in letter sizes for precision-critical applications
For unmatched drilling power, durability, and precision, the Norseman HD Super Premium Type 190-AG Jobber Length Twist Bit (Letter Sizes) is the preferred choice for machinists, fabricators, and industry professionals tackling the toughest materials.
