Cle-line C30524 Cobalt Mechanics Drill Bit 3/8 in

Product Description

The CLE-LINE C30524 is a cobalt mechanics drill bit designed for drilling into superalloys, titanium, and other hard materials that rapidly degrade standard high-speed steel tooling. Built to ASME B94.11M standards, this left-hand-cut bit features a 135-degree split point that reduces walking and requires no center punch on most surfaces. The gold finish provides a visual indicator of heat treatment and adds a layer of surface protection. At 4.125 inches overall length with a 2.375-inch flute, it fits standard drill chucks and is sized for work where compact length and rigidity matter more than deep-hole clearance.

This bit is suited for metal fabrication, aerospace maintenance, and general machining applications where high-cobalt tooling is specified. The left-hand cutting direction is particularly useful when extracting damaged or broken right-hand fasteners, as the rotation of the bit tends to back out the fastener as it cuts. Machinists, tool-and-die workers, and MRO technicians working with superalloy and titanium components will find this bit appropriate for their setups.

Key Features

• Cobalt tool material withstands the high heat generated when drilling superalloys and titanium
• 135-degree split point reduces thrust and eliminates the need for a center punch on many materials
• Left-hand cutting direction aids in backing out broken or seized right-hand fasteners
• Web-thinned, tapered web construction reduces cutting resistance and improves chip evacuation
• Gold finish provides visual confirmation of cobalt heat treatment
• Meets ASME B94.11M dimensional standards for mechanics-length drill bits

Compatibility

Designed for use in standard 3/8-inch straight-cylindrical shank drill chucks. Primary workpiece materials are superalloys and titanium, with material codes H, K, M, P, and S per Series 1880 classification. General-purpose tool performance rating.

Installation Notes

Install this bit in a keyed or keyless drill chuck rated for the shank diameter and intended RPM. Always verify spindle speed against recommended surface footage for cobalt tooling in the target material before cutting. Use cutting fluid or coolant appropriate for the workpiece material to extend tool life, even though this bit does not have through-coolant capability. Secure the workpiece firmly before drilling to prevent movement that can chip the split point or break the bit.