Hertel 66693482 Screw Machine Drill Bit Letter K Hss Tin

Product Description

The HERTEL 66693482 is a screw machine length drill bit designed for high-speed steel cutting in metalworking and machining applications. It carries a Letter K designation, corresponding to a 0.2810 inch decimal diameter, and features a 135-degree split point that reduces walking and allows drilling to start without a center punch. The TiN (titanium nitride) coating extends tool life by increasing surface hardness and reducing friction during cutting. At 2-11/16 inches overall length, the stub-style body provides increased rigidity compared to jobber-length bits, making it well suited for high-cycle production drilling and tight-clearance work.

This drill bit is used in screw machine operations, CNC drilling, manual drill press work, and hand drilling in metal fabrication shops, machine shops, and maintenance environments. The heavy-duty grade designation and web-thinned split point make it appropriate for drilling ferrous and non-ferrous metals, plastics, and composite materials in both production and repair contexts. It is installed and used by machinists, tool-and-die technicians, millwrights, and maintenance mechanics requiring a short, rigid bit for repetitive hole-making tasks.

Key Features

• Letter K size (0.2810 inch decimal diameter) for precise hole sizing
• 135-degree split point reduces thrust and eliminates center-punch requirement
• TiN coating increases hardness and extends cutting life versus uncoated HSS
• Screw machine (stub) length at 2-11/16 inches OAL provides superior rigidity
• Web-thinned, parallel web configuration reduces cutting resistance
• Straight-cylindrical shank fits standard drill chucks and collets

Compatibility

Designed as an OEM-style replacement or standard tooling selection for any drill press, screw machine, or CNC machining center equipped with a chuck or collet accepting a 0.2810 inch straight-cylindrical shank.

Installation Notes

This bit is installed by machinists and maintenance mechanics into drill press chucks, screw machine spindles, or hand drill chucks. Ensure the machine is de-energized and the spindle is fully stopped before changing tooling. Secure the shank fully into the chuck and tighten per the machine manufacturer's procedure to prevent slippage. Use appropriate cutting fluid for the material being drilled to maintain coating integrity and bit life.