Hertel 66693433 Drill Bit Letter F 135 Deg Hss Tin

Product Description

The HERTEL 66693433 is a screw machine length drill bit sized to Letter F (0.2570 inches) with a 135-degree split point and a titanium nitride (TiN) coating over a high-speed steel body. The split point geometry reduces walking on entry and lowers thrust force, making it well suited for production drilling and repeat-hole work. At 2.625 inches overall length with a 1.4375-inch flute length, this stub-length bit offers increased rigidity compared to jobber-length equivalents, reducing deflection in short-reach applications. The straight cylindrical shank seats directly in standard drill chucks without adapters.

Screw machine length drill bits like the 66693433 are commonly used in machine shop environments, production lines, and maintenance applications where rigidity and hole accuracy matter. The heavy-duty grade designation and web-thinned, parallel-web construction make this bit appropriate for drilling steel, cast iron, aluminum, and similar materials on drill presses, CNC machining centers, and hand-held power tools. It is a single-piece unit and ships individually.

Key Features

• Letter F size - 0.2570 inches diameter, falls within the 0.2500 to 0.3000 inch size range
• 135-degree split point reduces thrust and eliminates center punching on most metals
• TiN coating increases surface hardness and extends tool life in ferrous and non-ferrous materials
• Stub screw machine length provides greater rigidity and reduced deflection versus jobber-length bits
• Web-thinned parallel web lowers cutting resistance and improves chip evacuation
• Right-hand spiral flute, straight cylindrical shank - fits standard drill chucks directly

Compatibility

Designed as a direct-fit replacement or addition for any setup requiring a Letter F diameter screw machine length drill bit with a straight cylindrical shank in standard three-jaw or keyless drill chucks.

Installation Notes

Install and remove drill bits only with the spindle fully stopped and the machine powered down or the tool disconnected from its power source. Secure the straight cylindrical shank firmly in the chuck before initiating a cut to prevent slipping, which can damage the shank or the workpiece. Use appropriate cutting fluid or coolant for the material being drilled; note that this bit does not have internal coolant-through capability. Wear appropriate PPE including eye protection when operating drilling equipment.