Hertel 66693755 Jobber Drill Bit Letter a Tin Hss 135

Product Description

The HERTEL 66693755 is a jobber-length twist drill bit designed for general-purpose holemaking in metal, wood, and composite materials. Sized at Letter A (0.2340 inches decimal equivalent), it features a 135-degree split point that reduces walking and requires no center punch on most surfaces. The bit is manufactured from high speed steel with a titanium nitride (TiN) coating that extends tool life and reduces friction during cutting. With an overall length of 3.875 inches and a flute length of 2.625 inches, it fits standard drill chucks and magnetic drill presses used in fabrication, maintenance, and industrial service work.

This bit is suited for production drilling and field repair applications where a right-hand, spiral-flute jobber bit is the standard choice. The straight-cylindrical shank at 0.2340 inches diameter seats securely in keyed or keyless chucks. The tapered web and web-thinned geometry reduce thrust load, making it practical for hand drills and drill presses alike. It is a heavy-duty grade bit conforming to NAS specification, appropriate for machinists, pipefitters, ironworkers, and general maintenance mechanics working in light to medium-duty drilling applications.

Key Features

• Letter A size - 0.2340 inches decimal equivalent for precise hole sizing
• 135-degree split point reduces bit walking and lowers required thrust
• TiN coating extends cutting life and reduces heat buildup
• High speed steel construction handles intermittent and continuous drilling cycles
• Web-thinned, tapered web geometry for reduced feed force
• Right-hand spiral flute with regular spiral type for efficient chip evacuation

Compatibility

Designed as a standard jobber-length drill bit for use in any keyed or keyless chuck accepting a 0.2340-inch straight-cylindrical shank, including benchtop drill presses, hand drills, and right-angle drills commonly used in fabrication and maintenance applications.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with cutting tool selection and drill press or hand drill operation. Secure the shank fully in the chuck before drilling and verify spindle speed is appropriate for the workpiece material. Never exceed the rated speed for the bit diameter or material being drilled. Disconnect power to any drill press or tool before changing bits.