Hertel 83290452 Cobalt Drill Bit No. 27 135 Split Point

Product Description

The HERTEL 83290452 is a cobalt threaded shank drill bit designed for drilling into high-tensile strength metals. Built to NAS 965 Type D specification, it features a 135-degree split point that reduces walking on entry and requires no center punch in most applications. The oxide coating adds surface hardness and provides basic corrosion resistance. With a wire gauge size of No. 27 and a decimal equivalent of 0.1440 inches, this bit fits applications requiring precision hole sizing. The web-thinned, tapered web construction reduces thrust force and improves chip evacuation. Installation is performed by licensed machinists, maintenance technicians, and metal fabricators.

This drill bit is intended for use in high-tensile strength metal applications including stainless steel, alloy steel, titanium, and similar hard metals where standard high-speed steel bits wear prematurely. The short overall length of 1.25 inches provides rigidity in tight spaces and reduces deflection during drilling. The 1/4-28 threaded shank secures the bit in compatible quick-change or threaded drill chucks and fixtures common in aerospace, automotive, and industrial maintenance environments. Right-hand cutting with a regular spiral flute pattern handles a wide range of metal drilling tasks.

Key Features

• No. 27 wire gauge size — 0.1440 inch decimal equivalent for precision hole sizing
• 135-degree split point reduces walking and lowers thrust force requirements
• Web-thinned tapered web improves chip removal and reduces heat buildup
• Cobalt construction with oxide coating for durability in high-tensile metals
• NAS 965 Type D specification compliance for aerospace and industrial use
• 1/4-28 threaded shank for secure retention in compatible quick-change systems

Compatibility

Designed for use in compatible 1/4-28 threaded shank drill chucks and quick-change tooling systems; suited for general-purpose drilling in high-tensile strength metals per NAS 965 Type D specification.

Installation Notes

Installation is performed by machinists or qualified maintenance technicians using appropriate drill press, hand drill, or CNC equipment. Verify chuck compatibility with the 1/4-28 threaded shank before use. Secure the shank fully before applying power. Use appropriate cutting fluid when drilling hard or heat-sensitive alloys to extend bit life and control workpiece temperature.