Cle-line C30528 Cobalt Mechanics Drill Bit 7/16 in

Product Description

The CLE-LINE C30528 is a left-hand-cut cobalt mechanics drill bit designed for drilling into superalloys, titanium, and other hard-to-machine materials. The 7/16-inch diameter bit features a 135-degree split point that reduces walking on contact and lowers the thrust needed to start the cut. At 4-9/16 inches overall length with a 2-5/8-inch flute length, it fits standard drill chucks via its straight cylindrical shank. The gold coating provides surface hardness and helps identify web-thinned geometry at a glance. This bit is built to Series 1880 specifications and conforms to ASME B94.11M standards, making it a reliable choice for precision drilling in demanding shop and field conditions.

The C30528 is suited for machinists, maintenance mechanics, and metalworking professionals who need a left-hand-cut bit for removing broken fasteners or drilling in reverse rotation. The mechanics-length body fits tightly into drill presses and hand-held power drills alike. Primary workpiece materials include superalloys, titanium, and high-strength steels common in aerospace, heavy equipment, and industrial manufacturing environments. The general-purpose tool performance rating covers a broad range of production and repair applications.

Key Features

• Left-hand cutting direction aids broken bolt and stud extraction during reverse-rotation drilling
• 135-degree split point reduces walking and decreases required thrust at start of cut
• Cobalt construction with gold finish handles superalloys, titanium, and high-strength metals
• Web-thinned, tapered web configuration improves chip evacuation and reduces heat buildup
• Straight cylindrical shank fits standard three-jaw chucks without adapters
• Conforms to ASME B94.11M for dimensional consistency and interchangeability

Compatibility

Designed for use in standard drill presses and hand-held power drills with a 7/16-inch or larger chuck capacity. Primary workpiece materials are superalloys, titanium, and related hard metals per material codes H, K, M, P, and S.

Installation Notes

Left-hand drill bits are installed and used with the drill set to reverse rotation. Secure the workpiece firmly before drilling and use cutting fluid appropriate for cobalt tooling on hard metals to extend bit life. Inspect the split point for chipping before each use, as a damaged point will increase runout and heat. This bit should be handled and stored separately from right-hand bits to avoid mix-ups during fastener-extraction work.