Norseman Drill & Tool Letter Sizes HSS Heavy-Duty NAS 907B Type 190-ACN Jobber Length Twist Bit
TiCN-Coated Precision and Durability for Demanding Applications
The Norseman Drill & Tool Letter Sizes HSS Heavy-Duty NAS 907B Type 190-ACN Jobber Length Twist Bit is engineered for professionals who require exceptional precision, power, and long-lasting performance. Proudly Made in the USA, this high-performance drill bit meets stringent NAS 907B aerospace-grade specifications, ensuring accuracy, consistency, and reliability across all letter-size increments.
Built for Hard Metals and High-Load Drilling
Manufactured from premium high-speed steel (HSS), the Type 190-ACN delivers superior strength and durability when drilling tough materials such as stainless steel, titanium, hardened alloys, and high-tensile metals. The 135° self-centering split point ensures fast penetration, minimizes walking, and reduces thrust pressure—resulting in cleaner, more precise hole finishes in both hand-held and machine drilling environments.
TiCN Coating for Superior Performance
A standout feature of this drill bit is its advanced Titanium Carbon Nitride (TiCN) coating, engineered to significantly enhance:
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Surface hardness
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Lubricity and chip evacuation
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Heat and wear resistance
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Cutting speed and overall tool life
TiCN provides a low-friction, ultra-hard surface that keeps cutting edges sharper for longer, especially in high-speed or continuous drilling applications. This makes the 190-ACN ideal for demanding industrial environments where performance cannot be compromised.
Aerospace-Grade Precision
Every bit is precision-ground to NAS 907B tolerances, ensuring perfect balance, vibration-free operation, and consistent hole geometry. With letter-size increments, machinists and fabricators get the exact sizing required for precision-critical tasks.
Key Features
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Titanium Carbon Nitride (TiCN) coating for extreme hardness & lubricity
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Heavy-duty HSS construction for drilling hard metals and alloys
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135° split point for accurate, walk-free starts and reduced thrust
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Precision-ground to NAS 907B aerospace specifications
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Available in letter sizes for tight-tolerance drilling
For unmatched strength, precision, and tool life, the Norseman Type 190-ACN Letter-Size Twist Bit delivers the elite performance trusted by professionals in machining, fabrication, and industrial maintenance.
