Hertel 66693540 Screw Machine Drill Bit Letter Q Hss Tin

Product Description

The HERTEL 66693540 is a screw machine length drill bit designed for high-production drilling in metal fabrication, machining, and general metalworking applications. The bit is sized at Letter Q, equal to 0.3320 inches decimal, with a 135-degree split point that reduces walking and cutting pressure on entry. The titanium nitride (TiN) coating increases surface hardness and extends tool life compared to uncoated high-speed steel. At 3 inches overall length and a heavy-duty grade designation, this bit is built for use in drill presses, CNC machines, turret lathes, and screw machines where a stub-length tool is preferred for rigidity.

This drill bit is suited for shops and field machinists drilling ferrous and non-ferrous metals, plastics, and composite materials where a shorter, stiffer tool reduces deflection and improves hole accuracy. The straight-cylindrical shank fits standard drill chucks and collet holders without modification. The right-hand spiral flute and web-thinned geometry make it a practical choice for production drilling in both manual and automated setups. Licensed machinists, tool and die techs, and maintenance mechanics are the typical end users.

Key Features

• Letter Q size (0.3320 inches) with 135-degree split point for reduced thrust and self-centering entry
• TiN coating improves wear resistance and reduces friction during cutting
• Web-thinned, parallel web configuration lowers cutting force requirements
• Screw machine length (3 inches OAL) provides added rigidity over jobber-length bits
• Heavy-duty grade high-speed steel construction handles intermittent and continuous production drilling
• Straight-cylindrical shank fits standard drill chucks and collet toolholders

Compatibility

Designed as an OEM-style replacement or production consumable for screw machine, drill press, turret lathe, and CNC drilling applications accepting a 0.3320-inch straight-cylindrical shank drill bit.

Installation Notes

Installation is performed by machinists or maintenance mechanics familiar with metal cutting tool handling. Secure the shank fully in the chuck or collet before operation and verify runout before drilling production parts. Always power down and lock out the spindle before changing tooling. Follow applicable OSHA machine guarding requirements and shop safety protocols when operating drilling equipment.