Hertel 66693599 Screw Machine Drill Bit Letter V Hss Tin

Product Description

The HERTEL 66693599 is a screw machine length drill bit sized to Letter V (0.3770 inches decimal) with a 135-degree split point and a titanium nitride (TiN) coating over a high-speed steel body. Screw machine length bits are shorter than jobber bits, which increases rigidity and reduces deflection in production drilling, turret lathe work, and CNC applications. The split point geometry starts cutting on contact without a center punch, and the web-thinned parallel web keeps thrust loads low. This bit is intended for use by machinists, tool-room technicians, and maintenance trades working in metal fabrication or production environments.

This drill bit fits applications where a shorter, stiffer bit reduces runout and chatter in tight-clearance setups. The TiN coating extends tool life when cutting mild steel, alloy steel, cast iron, and similar ferrous materials. With a straight cylindrical shank at 0.3770 inches, it seats directly in standard drill chucks, collet holders, and quick-change tooling systems without adapters. Regular spiral fluting clears chips efficiently at standard cutting speeds for high-speed steel tooling.

Key Features

• Letter V size - 0.3770 inches decimal, within the 0.3500 to 0.4000 inch size range
• 135-degree split point starts on contact and reduces walking without center-punching
• TiN coating increases surface hardness and extends edge life versus uncoated HSS
• Web-thinned parallel web lowers thrust and improves chip evacuation
• Screw machine length (3.25 inches OAL) provides extra rigidity over jobber-length equivalents
• Heavy-duty drill bit grade for production and repetitive drilling cycles

Compatibility

Designed as an OEM-style replacement or direct substitute for screw machine length drill bits in the Letter V size class, compatible with any standard drill chuck or collet accepting a 0.3770-inch straight cylindrical shank.

Installation Notes

Installation and use of this bit should be performed by a qualified machinist or maintenance technician familiar with drill press, lathe, or CNC spindle setup. Ensure the machine spindle is fully stopped and locked out before seating or removing the bit from the chuck or collet. Inspect the shank and flutes for damage before each use. Follow the machine manufacturer and tooling manufacturer recommended surface footage and feed rate guidelines for high-speed steel bits when selecting spindle speed.