Norseman Drill & Tool Letter Sizes Premium NAS 907B Type 190-CN Jobber Length Twist Drill
CN-TECH™ Coated Precision for Industrial Performance
The Norseman Drill & Tool Letter Sizes Premium NAS 907B Type 190-CN Jobber Length Twist Drill is engineered for industrial professionals who require uncompromising accuracy, durability, and longevity. Proudly Made in the USA, this high-performance bit is manufactured to NAS 907B aerospace specifications, ensuring exceptional consistency and precision across demanding machining, fabrication, and production environments.
Advanced CN-TECH™ Nitride & Cryogenic Treatment
Crafted from premium high-speed steel (HSS), the 190-CN series features Norseman’s exclusive CN-TECH™ nitride case hardening, a process that dramatically increases surface hardness, lubricity, and wear resistance. This enhancement enables the drill to cut cooler and cleaner, providing extended service life in tough materials such as stainless steel, titanium, tool steels, and high-tensile alloys.
To further improve performance, each bit undergoes a -300°F cryogenic treatment, refining the steel’s microstructure for enhanced molecular stability. This treatment boosts edge retention, minimizes brittleness, and ensures dependable performance under continuous or high-speed drilling conditions where ordinary drills fail.
Precision Engineering for Superior Accuracy
A 135° self-centering split point ensures fast, accurate starts and reduces walking on curved, hardened, or irregular surfaces. Precision-ground flutes provide smooth chip evacuation, lowering heat buildup and enabling efficient cutting action throughout the drill’s lifespan.
Finished with a black and bronze oxide coating, the 190-CN drill delivers improved corrosion protection, lubricity, and overall drilling efficiency. Available in letter-size increments, it offers the precision sizing required for aerospace, machining, and high-tolerance manufacturing applications.
Key Features
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CN-TECH™ nitride case hardening for exceptional wear resistance
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Cryogenic treatment (-300°F) enhances toughness and edge retention
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Meets NAS 907B aerospace-grade performance standards
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135° split point for accurate, walk-free starts
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Precision-ground flutes for efficient chip evacuation
For superior precision, durability, and industrial-grade reliability, the Norseman Drill & Tool Letter Sizes Premium NAS 907B Type 190-CN Jobber Length Twist Drill delivers unmatched performance in every application.
