Triumph Twist Drill 011531 Cobalt Drill Bit 31/64 in

Product Description

The TRIUMPH TWIST DRILL 011531 is a jobber-length cobalt drill bit engineered for high-performance drilling in tough materials. Finished with a gold oxide coating for added lubricity and heat resistance, this bit features a 135-degree split point that is self-centering and reduces the need for a center punch. The straight-cylindrical shank measures 31/64 inches in diameter and accepts standard drill chucks. At 5-7/8 inches overall length with a 4-3/8-inch flute length, it suits a wide range of jobber-length drilling applications. Intended for installation and maintenance professionals working with hard metals and alloy steels.

This bit is designed for drilling into alloy steel and other hard ferrous metals where standard high-speed steel bits wear prematurely. The right-hand spiral flute with regular spiral type evacuates chips efficiently during deep-hole drilling. Its web-thinned, tapered web configuration reduces thrust requirements and improves penetration in tough workpiece materials. The heavy-duty T1C series rating makes it a practical choice for industrial and trade environments where bit longevity under repeated use is a priority.

Key Features

• Cobalt construction with gold oxide coating for heat and wear resistance
• 135-degree split point for self-centering starts without a center punch
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Web-thinned tapered web reduces drilling thrust on hard materials
• Straight-cylindrical shank fits standard drill chucks
• Heavy-duty T1C series rated for high-performance industrial use

Compatibility

Designed as a jobber-length replacement or stock drill bit for use with standard straight-shank drill chucks in the 0.4000 to 0.5000 decimal inch size range, suitable for drilling alloy and alloy steels.

Installation Notes

Installation of this drill bit is performed by machinists, maintenance technicians, and trade professionals using a standard drill press, hand drill, or milling machine with a compatible chuck. Ensure the chuck is fully tightened and the workpiece is securely clamped before drilling. Use appropriate cutting fluid or coolant when drilling alloy steel to extend bit life. Inspect the cutting edges for wear before each use and replace when penetration rate drops or point geometry is visibly degraded.