Hertel 53384392 Cobalt Drill Bit No. 8 Wire 135 Point

Product Description

The HERTEL 53384392 is a cobalt threaded shank drill bit designed for drilling into hard and abrasive materials where standard high-speed steel bits wear prematurely. It carries a No. 8 wire gauge size with a decimal equivalent of 0.1990 inches and features a 135-degree standard point angle that reduces walking and requires less feed pressure at startup. The 1/4-28 threaded shank allows secure, repeatable mounting in compatible threaded-shank toolholders. An oxide coating is applied to the exterior to reduce friction and extend tool life during drilling operations. At 2.125 inches overall length, this bit is suited for confined-space applications where a shorter tool is needed.

This drill bit is used in metal fabrication, maintenance, and production drilling applications where cobalt-grade tooling is specified. It is appropriate for drilling stainless steel, high-strength alloys, cast iron, and other work-hardening materials. The threaded shank design is typically found in bench drill setups, CNC drilling heads, and specialty hand-tool holders that accept 1/4-28 threaded shanks. Machinists, tool and die technicians, and industrial maintenance professionals commonly specify cobalt drill bits for these material types.

Key Features

• Cobalt drill bit material resists heat and wear in hard-metal drilling applications
• 135-degree standard point angle reduces bit walking and cutting torque at entry
• 1/4-28 threaded shank provides positive, repeatable engagement in compatible holders
• Oxide finish reduces friction between flute and workpiece during chip evacuation
• Spiral regular flute geometry with a 1.25-inch flute length supports consistent chip clearing
• Short 2.125-inch overall length suits tight-clearance drilling setups

Compatibility

Designed for use in toolholders and drilling systems that accept a 1/4-28 threaded shank. Verify holder thread specification before installation.

Installation Notes

Threaded shank drill bits are installed and removed by a machinist or tooling technician using the appropriate threaded-shank holder for the 1/4-28 thread specification. Always power down and lock out the drill press, CNC machine, or motor before changing tooling. Confirm the bit is fully seated and the holder is torqued to the holder manufacturer's specification before resuming operation. Inspect the cutting edges and shank threads for damage before each use.