Triumph Twist Drill 060405 5/64 Screw Machine Drill Bit

Product Description

The TRIUMPH TWIST DRILL 060405 is a screw machine length drill bit engineered for heavy-duty drilling in demanding applications. It measures 5/64 inch (0.0781 inches) in diameter with an overall length of 1-11/16 inches and a flute length of 11/16 inch (0.6875 inches). The 135-degree split point reduces walking and allows the bit to bite into material without a center punch. Made from coated high speed steel, this bit is built for right-hand cutting with a regular spiral flute and a straight-cylindrical shank. It belongs to the T4HD series, which is designed for heavy-duty performance in tight-tolerance work.

This bit is suited for production drilling in superalloy and hard-material workpieces where stub-length rigidity is required. The screw machine length designation means a shorter body than a jobber bit, which reduces deflection and improves hole straightness in CNC machines, drill presses, and turret lathes. It is a common choice for precision hole work in aerospace, automotive, and general machining environments where high feed rates and accurate positioning are essential.

Key Features

• 5/64 inch (0.0781 inches) diameter, screw machine (stub) length for maximum rigidity
• 135-degree split point eliminates walking and reduces thrust force required
• Coated high speed steel construction for extended tool life in hard materials
• Web-thinned, tapered web configuration reduces cutting resistance
• Right-hand spiral flute efficiently clears chips from the cutting zone
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a heavy-duty screw machine length drill bit for use in standard straight-shank drill chucks on CNC machining centers, drill presses, and turret lathes drilling superalloys and similar hard workpiece materials.

Installation Notes

This bit is installed and changed by machinists or toolroom technicians following standard machine shop lockout/tagout procedures before any tool change. Ensure the chuck is clean and the shank is fully seated before tightening. Do not exceed the recommended RPM for the workpiece material and bit diameter. Cutting fluid or coolant is recommended when drilling superalloys to manage heat, even though the bit does not support through-coolant delivery.