Norseman Drill & Tool Fractional Sizes HSS Heavy-Duty NAS 907B Type 190 Jobber Length Twist Bit
Engineered for Strength, Accuracy, and Long Life
The Norseman Drill & Tool Fractional Sizes HSS Heavy-Duty NAS 907B Type 190 Jobber Length Twist Bit is built for professionals who require uncompromising performance, precision, and durability. Proudly Made in the USA, this jobber-length drill bit meets strict NAS 907B aerospace specifications, ensuring exceptional accuracy, consistency, and tool life across industrial, construction, and maintenance environments.
Heavy-Duty Construction for Tough Materials
Manufactured from premium high-speed steel (HSS), the Type 190 is engineered to drill through challenging materials such as stainless steel, alloy steels, cast iron, and other hard metals. Its heavy-duty design provides superior rigidity and torsional strength, reducing deflection and maintaining accuracy even under high-load conditions.
The 135° self-centering split point provides fast, precise starts without walking and reduces thrust pressure, eliminating the need for a center punch. This makes the Type 190 ideal for precision drilling on curved, hardened, or uneven surfaces.
Enhanced Wear Resistance and Longer Tool Life
A black oxide surface finish enhances the bit’s performance by increasing lubricity, reducing friction, and improving chip evacuation. This results in cooler operation, cleaner hole finishes, and extended tool life. The added corrosion resistance ensures consistent reliability in demanding shop and field environments.
Each bit is precision-ground to aerospace tolerances, offering superior balance, stability, and repeatable accuracy—qualities essential for machinists, fabricators, and maintenance professionals.
Key Features
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Heavy-duty HSS construction for drilling tough, hard metals
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135° self-centering split point for accurate, walk-free starts
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Black oxide finish enhances wear resistance and chip flow
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Manufactured to NAS 907B aerospace-grade specifications
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Available in fractional sizes for versatile industrial use
For dependable power, precision, and long-lasting performance, the Norseman Type 190 Jobber Length Twist Bit remains the trusted choice for professionals who expect the best from their drilling tools.
