Triumph Twist Drill 094139 Reduced Shank Drill Bit

Product Description

The TRIUMPH TWIST DRILL 094139 is a reduced shank drill bit designed for professionals who need to run larger diameter holes through a standard 1/2-inch chuck. The cutting diameter measures 39/64 inches (0.6094 inches decimal), while the Weldon shank reduces to 1/2 inch for broad machine compatibility. Built from high speed steel with a coated finish, this bit handles tough materials encountered in metal fabrication, mechanical assembly, and general trade work. The 118-degree split point promotes accurate starting without a center punch and reduces walking on flat stock.

This bit belongs to the Series T9FHD line and suits applications in manufacturing, maintenance, and field installation where a standard 1/2-inch drill press, mag drill, or handheld drill motor is available. The Weldon shank with three flats locks positively into set-screw style chucks and tool holders, preventing slippage under load. Right-hand spiral flutes move chips efficiently out of the hole during drilling. Maximum drilling depth reaches 3 inches, making it appropriate for thick plate and structural steel work as well as general fabrication tasks.

Key Features

• Reduced shank design allows 39/64-inch cutting diameter through a standard 1/2-inch chuck or tool holder
• 118-degree split point for self-centering starts and reduced thrust on harder materials
• Weldon shank with three flats prevents rotational slippage in set-screw tool holders
• High speed steel construction provides durability across steel, cast iron, and general-purpose materials
• Coated finish for improved wear resistance and chip evacuation
• Right-hand cut with regular spiral flutes for efficient chip removal

Compatibility

Designed for use with 1/2-inch Weldon-style chucks, end mill holders, and set-screw tool holders on drill presses, milling machines, and magnetic base drills.

Installation Notes

Installation and operation should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Ensure the machine spindle is fully stopped and power is locked out before inserting or removing the bit. Seat the Weldon shank fully into the tool holder and tighten all set screws evenly against the flats before beginning any cut. Use appropriate cutting fluid or coolant for the material being drilled to extend tool life, even though this bit is rated for dry use.