Hertel 61699450 Screw Machine Drill Bit Letter T Hss

Product Description

The HERTEL 61699450 is a screw machine length drill bit sized to Letter T (0.3580 inches) with a 118-degree standard point angle. Built from high-speed steel with an oxide coating, this bit is designed for general-purpose drilling in metal, wood, and plastics. The shortened screw machine length body provides added rigidity compared to jobber-length bits, reducing deflection when drilling from close clearances or in turret lathes, drill presses, and CNC machining centers. The straight-cylindrical shank fits standard chucks without adapters. This bit is a common choice for machinists, tool-and-die shops, and maintenance technicians who need accurate, repeatable hole production at Letter T diameter.

Screw machine length drill bits are used in production and maintenance environments where rigidity and chip clearance matter. The 61699450 suits close-tolerance drilling operations in ferrous and non-ferrous metals, and it fits manual drill presses, lathes, and CNC setups requiring a straight-shank bit. The 3xD flute-to-diameter ratio and 1.75-inch flute length provide adequate chip evacuation for typical through-hole and blind-hole applications in general shop work. A right-hand spiral flute pulls chips up and out of the cut with standard right-hand rotation.

Key Features

• Letter T size (0.3580 inches) within the 0.3500 to 0.4000 inch drill bit size range
• 118-degree standard point angle for general-purpose drilling across common work materials
• High-speed steel construction with oxide coating for wear resistance and reduced friction
• Screw machine length body (3-1/16 inches OAL) provides greater rigidity than jobber-length bits
• Straight-cylindrical shank fits standard 3-jaw chucks and collets without adapters
• 2-flute regular spiral design with 1.75-inch flute length for efficient chip evacuation

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with any drill press, lathe, or machining center equipped with a chuck or collet sized to accept a straight-cylindrical shank at 0.358 inches nominal diameter.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill press or lathe setup procedures. Secure the shank fully in the chuck or collet before operation and verify runout before production drilling. Always reduce spindle speed and apply cutting fluid when drilling hardened or stainless steel to extend tool life. This bit does not support coolant-through operation.