Cle-line C66013 Cobalt Jobber Drill Bit Letter E

Product Description

The CLE-LINE C66013 is a cobalt jobber-length drill bit sized to Letter E (0.250 inches) with a 135-degree split point and a titanium nitride (TiN) coating. The split point geometry starts on contact without a center punch, reducing walking on hard materials. The cobalt construction resists heat buildup, making this bit suitable for intermittent or sustained drilling in tough ferrous and non-ferrous stock. The TiN coating adds surface hardness and extends tool life in general-purpose production drilling. At 4 inches overall length with a 2.75-inch flute, this is a standard jobber proportion suited for hand-held drills, drill presses, and mill setups. Machinists, fabricators, and maintenance mechanics are the primary users.

This bit is designed for drilling alloy steel, carbon steel, cast iron, aluminum, and other non-ferrous metals. The right-hand, two-flute spiral configuration evacuates chips effectively in through-hole and blind-hole applications. The straight cylindrical shank at 0.250 inches (6.35 mm) fits standard three-jaw chucks without a reducer. It carries ANSI designation under Series 1501-TT and is built for general-purpose drilling in both shop and field environments. No coolant-through capability is present, so external cutting fluid application is recommended when drilling hard or thick stock.

Key Features

• Letter E sizing equals 0.250 inches (1/4 inch) diameter for a precise, standardized fit
• 135-degree split point starts cutting immediately on contact, no center punch required
• Cobalt construction handles elevated temperatures generated by hard-material drilling
• TiN coating increases surface hardness and extends usable tool life
• Web-thinned, tapered web geometry reduces thrust force and improves chip flow
• Straight shank at 0.250 inches fits standard chucks on drill presses, hand drills, and mills

Compatibility

Designed as a general-purpose jobber drill bit compatible with any standard three-jaw chuck or collet accepting a 0.250-inch straight shank. Suitable for use on ferrous and non-ferrous workpiece materials as noted under ANSI Series 1501-TT specifications.

Installation Notes

Installation and use of this bit is performed by machinists, fabricators, and maintenance mechanics. Secure the straight shank fully in the chuck before operation and verify chuck key removal before powering the machine. Apply an appropriate cutting fluid or oil externally when drilling hard steels or cast iron to manage heat and extend bit life. Follow shop safety protocols and applicable ANSI machine guarding standards when operating drill presses or milling equipment.