Norseman Drill & Tool Wire Gauge Sizes Premium NAS 907B Type 190-CN Jobber Length Twist Drill
CN-TECH™ Coated Power for Precision Drilling
The Norseman Drill & Tool Wire Gauge Sizes Premium NAS 907B Type 190-CN Jobber Length Twist Drill is engineered for aerospace-level precision, maximum durability, and exceptional performance in demanding drilling applications. Proudly Made in the USA, this premium drill bit adheres to NAS 907B aerospace specifications, ensuring consistent accuracy, strength, and reliability for machining, fabrication, and high-tolerance manufacturing.
Advanced CN-TECH™ Nitride Case Hardening
Constructed from premium high-speed steel (HSS), the Type 190-CN undergoes Norseman’s exclusive CN-TECH™ nitride case hardening process, dramatically increasing surface hardness, lubricity, and corrosion resistance. This advanced treatment allows the drill to cut cooler and cleaner, providing extended service life when drilling stainless steel, titanium, high-tensile alloys, or other demanding materials.
Cryogenic Treatment for Extreme Toughness
To further enhance durability, each drill receives a cryogenic treatment at -300°F, refining the steel’s molecular grain structure. This process significantly improves toughness, reduces brittleness, and enhances edge retention—meaning fewer tool changes, greater consistency, and superior performance under high-speed or heavy-load conditions.
Precision Engineering for Accurate Hole Making
A 135° self-centering split point ensures fast, accurate penetrations with minimal walking, reducing thrust and improving start accuracy. Precision-ground flutes optimize chip evacuation and maintain cooler operation, enhancing both hole quality and tool longevity. The black and bronze oxide finish boosts lubricity, reduces friction, and provides corrosion protection for long-lasting, dependable performance.
Available in wire gauge sizes, this drill bit provides fine incremental precision ideal for aerospace components, precision machining, and high-tolerance assembly work.
Key Features
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CN-TECH™ nitride case hardening for superior wear resistance
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Cryogenic treatment (-300°F) boosts toughness and edge retention
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Meets NAS 907B aerospace-grade specifications
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135° split point for accurate, walk-free starts
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Precision-ground flutes for efficient chip evacuation
For unmatched precision, strength, and longevity, the Norseman Wire Gauge Sizes Premium NAS 907B Type 190-CN Jobber Length Twist Drill delivers professional-grade performance that stands above the competition.
