Norseman Drill & Tool Letter Sizes HSS Heavy-Duty NAS 907B Type 190 Jobber Length Twist Bit
Precision-Crafted for Strength and Performance
The Norseman Drill & Tool Letter Sizes HSS Heavy-Duty NAS 907B Type 190 Jobber Length Twist Bit delivers exceptional durability, accuracy, and performance for professionals working in demanding drilling environments. Proudly Made in the USA, this high-quality drill bit is manufactured to NAS 907B aerospace-grade specifications, ensuring consistency and precision for machining, fabrication, maintenance, and industrial applications.
Heavy-Duty Construction for Tough Materials
Crafted from premium high-speed steel (HSS), the Type 190 Letter Size series is engineered to withstand high-load drilling in challenging materials such as stainless steel, alloy steels, hardened metals, and cast iron. Its heavy-duty design provides outstanding rigidity and cutting strength, ensuring smooth penetration and reduced risk of breakage—even under extreme drilling conditions.
The 135° self-centering split point ensures accurate, walk-free starts and reduces thrust pressure, eliminating the need for a center punch while improving efficiency on curved or hard surfaces.
Enhanced Lubricity, Wear Resistance, and Tool Life
Featuring a black oxide finish, this drill bit offers enhanced lubricity, improved chip flow, and increased wear resistance. The finish helps reduce friction, minimize heat buildup, and deliver cleaner, more precise hole finishes—extending tool life and performance consistency during continuous or high-speed drilling.
Each Type 190 Letter Size drill bit is precision-ground to meet strict aerospace tolerances, guaranteeing superior balance, concentricity, and exact hole sizing across the full range of letter increments.
Key Features
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Heavy-duty HSS construction for drilling tough metals
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135° self-centering split point for accurate, walk-free starts
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Black oxide finish enhances lubricity and wear resistance
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Meets NAS 907B aerospace-grade specifications
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Available in letter sizes for precision-critical applications
For professionals seeking reliability, accuracy, and long-lasting performance, the Norseman Type 190 Letter Size Jobber Length Twist Bit stands as a trusted, American-made solution engineered for excellence.
