Value Collection 1054163 Letter I Cobalt Jobber Drill Bit

Product Description

The VALUE COLLECTION 1054163 is a cobalt jobber-length drill bit sized to Letter I (0.2720 inches / 0.272 decimal inch) with a 135-degree split-point geometry and a black oxide coating. Cobalt construction provides elevated heat resistance compared to standard high-speed steel, making this bit suitable for harder and more abrasive materials. The parabolic flute design improves chip evacuation and helps reduce heat buildup during extended drilling cycles. Overall length is 4.125 inches, flute length is 2.875 inches, and the straight cylindrical shank diameter matches the drill diameter at 0.2720 inches. The bit carries NAS 907-J specification and is web-thinned at the tip for easier penetration and reduced thrust requirements.

This drill bit is intended for general-purpose drilling in steel, cast iron, and similar ferrous metals in production and maintenance applications. The right-hand cutting direction is standard for conventional drilling setups. It is suited for use in handheld drill motors, drill presses, and CNC machining centers where a straight-shank jobber bit is appropriate. The 135-degree point angle self-centers more reliably on curved or irregular surfaces than a standard 118-degree point, reducing the need for a center punch in many situations. Series L6501 positions this bit in a general-purpose cobalt lineup for professional trades and machining environments.

Key Features

• Letter I size (0.2720 inches) with h8 diameter tolerance for consistent fitment
• Cobalt construction for improved heat and wear resistance in ferrous materials
• 135-degree split point with X-thinning for reduced thrust and self-centering capability
• Parabolic flute profile promotes faster chip evacuation and cooler cutting
• Black oxide coating provides corrosion resistance and reduces friction at the cutting edge
• NAS 907-J specification compliance for dimensional and performance consistency

Compatibility

Designed for use in any standard straight-shank drill chuck rated for the 0.2720-inch shank diameter. Primary workpiece materials listed by the manufacturer are steel and cast iron. Coolant-through capability is not supported on this bit.

Installation Notes

Secure the straight cylindrical shank fully in a properly sized chuck before operation and verify the chuck key is removed before starting the spindle. Use cutting fluid or cutting oil when drilling steel or cast iron to extend tool life and maintain dimensional accuracy. Ensure the workpiece is firmly clamped to prevent movement during drilling. Inspect the cutting edges for wear or chipping before each use and replace the bit if tip geometry is compromised.