Cle-line C30520 5/16 in Cobalt Mechanics Drill Bit

Product Description

The CLE-LINE C30520 is a left-hand cobalt mechanics drill bit designed for drilling into superalloys, titanium, and other high-strength materials. Built to ASME B94.11M standards, it features a 135-degree split point that reduces walking and requires no center punch on most surfaces. The gold finish indicates a cobalt-alloyed construction throughout, providing the heat resistance needed for harder workpiece materials. At 3.75 inches overall length with a 2.125-inch flute, this is a compact mechanics-length bit suited for close-quarters drilling in production and maintenance environments. Installed by machinists and maintenance mechanics working with difficult-to-machine alloys.

The C30520 is best suited for applications involving superalloys, titanium, and similarly demanding materials where standard high-speed steel bits fail prematurely. The left-hand cutting direction makes it particularly effective for removing broken fasteners and reverse-threaded extraction work. The mechanics length keeps the bit rigid in tight spaces where a jobber-length bit would flex or wander. It is a single-piece unit packaged individually, part of the Series 1880 line.

Key Features

• 135-degree split point reduces thrust and eliminates walking on entry
• Left-hand cutting direction for broken bolt extraction and reverse-threading applications
• Cobalt construction with gold finish provides heat resistance for superalloys and titanium
• Web-thinned tapered web configuration reduces cutting resistance
• Mechanics length (3.75 inches OAL) provides rigidity in confined work areas
• Meets ASME B94.11M dimensional standards

Compatibility

Designed for use on superalloy and titanium workpieces; compatible with standard 5/16 inch straight-shank drill chucks used in drill presses, hand drills, and CNC equipment.

Installation Notes

Installation and use of this bit requires a drill or drill press with a chuck rated for 5/16 inch straight-cylindrical shanks. Always secure the workpiece firmly before drilling and use appropriate cutting fluid when working with superalloys or titanium to prolong bit life and maintain cutting efficiency. Ensure the drill spindle rotation is set to reverse when using this left-hand bit for fastener extraction. Eye protection and appropriate PPE should be worn during operation.