Hertel 84024082 Cobalt Drill Bit 1/8 in 135 Split Point

Product Description

The HERTEL 84024082 is a cobalt threaded shank drill bit designed for drilling into high-tensile strength metals. It features a 135-degree split point with web thinning for fast starts and reduced walking without a center punch. The 1/4-28 threaded shank provides a positive mechanical connection to compatible threaded adapters, making it a reliable choice for precision work in demanding applications. The oxide coating adds surface hardness and light corrosion resistance. At 1 inch overall length with a 9/16 inch flute, this is a compact bit built for tight-clearance drilling. Machinists, sheet metal workers, and HVAC fabricators are the primary installers for this bit type.

This bit is suited for use on high-tensile strength metals including stainless steel, titanium alloys, and hardened steel stock. The short overall length and threaded shank make it appropriate for production drilling environments where bit retention and repeatability matter. It cuts right-hand with a regular spiral flute and is classified as general purpose under NAS 965 Type D specification, making it a standard reference bit for aerospace and industrial fabrication shops.

Key Features

• Cobalt construction for high-heat resistance when drilling hard metals
• 135-degree split point with web thinning reduces thrust force and eliminates walking
• 1/4-28 threaded shank for secure, tool-free bit retention in compatible holders
• Oxide coating provides surface hardness and mild corrosion protection
• NAS 965 Type D specification compliance for industrial and aerospace reference
• Compact 1 inch OAL suitable for tight-clearance or fixture-guided drilling

Compatibility

Designed for use with 1/4-28 threaded shank drill adapters and holders. Intended for drilling high-tensile strength metals as a general purpose cobalt bit per NAS 965 Type D specification.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or trade professionals familiar with metal drilling operations. Secure the bit fully into the threaded adapter before operating and confirm the shank is fully seated. Use appropriate cutting fluid or coolant when drilling hardened or stainless alloys to extend bit life, noting this bit does not have coolant-through capability. Follow applicable shop safety standards and machine guarding requirements during use.