Hertel 66693532 Screw Machine Drill Bit Letter P Hss Tin

Product Description

The HERTEL 66693532 is a screw machine length drill bit designed for high-speed steel cutting applications where a shorter, more rigid tool is required. Sized at Letter P (0.3230 inches decimal), this bit features a 135-degree split point that reduces walking on entry and lowers the thrust needed to start a hole. The titanium nitride (TiN) coating increases surface hardness and extends tool life in ferrous and non-ferrous materials. With an overall length of 2-15/16 inches and a flute length of 1-11/16 inches, it fits standard drill chucks and machine spindles. Intended for machinists, tool-room technicians, and maintenance trades working in production or job-shop environments.

Screw machine length drill bits are used where stub-length rigidity is preferred over jobber-length reach. The shortened body reduces deflection in drilling fixtures, CNC machining centers, drill presses, and hand-held power tools used in tight or confined setups. This bit is suited for repetitive hole production in mild steel, aluminum, cast iron, and similar materials. The right-hand spiral flute and web-thinned, parallel-web construction promote efficient chip evacuation in through-hole and blind-hole drilling operations.

Key Features

• Letter P size - 0.3230 inches decimal diameter with matching straight-cylindrical shank
• 135-degree split point reduces drill walk and lowers entry thrust
• TiN coating increases surface hardness and extends cutting life over uncoated HSS
• Web-thinned parallel web improves chip flow and reduces heat buildup at the cutting edge
• Heavy-duty drill bit grade construction for production and repetitive drilling cycles
• No coolant-through requirement - compatible with standard external flood or mist coolant setups

Compatibility

Designed as an OEM-style replacement or direct-use screw machine length drill bit for standard 3-jaw drill chucks and machine spindles accepting a 0.3230-inch straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Ensure the machine spindle is fully stopped and the chuck is secure before inserting or removing the bit. Verify that workpiece fixturing is rigid and that the selected spindle speed and feed rate are appropriate for the material being drilled. Eye protection and appropriate PPE must be worn during all drilling operations per applicable shop safety standards.