Hertel 74130816 Screw Machine Drill Bit Size 29 Cobalt

Product Description

The HERTEL 74130816 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including hardened steels, stainless steel, and other abrasion-resistant alloys. Built to wire gauge Size 29 with a decimal diameter of 0.1360 inches, this bit features a 135-degree split point that starts on contact without a center punch and reduces walking on curved or uneven surfaces. The overall length of 1-15/16 inches suits short-reach, high-torque applications in drill presses, CNC machining centers, and hand-held power tools. Licensed machinists, tool-and-die technicians, and industrial maintenance mechanics rely on cobalt construction for extended tool life in demanding production environments.

This drill bit is suited for production drilling and general-purpose shop work where standard high-speed steel bits wear prematurely. The screw machine length format provides added rigidity compared to jobber-length bits, making it a preferred choice for close-tolerance work in fixtures and jigs. It drills right-hand with a regular spiral flute geometry and a parallel web configuration. The web-thinned point reduces thrust force and keeps heat buildup manageable during repeated drilling cycles without coolant-through capability.

Key Features

• Cobalt construction provides heat and wear resistance for drilling hard metals
• 135-degree split point starts on contact and reduces bit walking
• Web-thinned, parallel web design lowers required thrust force
• Screw machine length at 1-15/16 inches overall delivers added rigidity over jobber-length alternatives
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Straight cylindrical shank compatible with standard drill chucks and collet holders

Compatibility

Designed as an OEM-style replacement or production-use screw machine length drill bit for use in standard drill press chucks, CNC turret setups, and hand-held power tool chucks accepting straight cylindrical shanks in the 0.1000 to 0.1500 inch decimal inch size range.

Installation Notes

Installation and bit changes should be performed with the drill press or power tool fully powered down and the chuck key removed from the work area. Secure the straight shank firmly in the chuck or collet to prevent slipping under load. A licensed machinist or qualified maintenance technician should verify spindle speed and feed rate are appropriate for the workpiece material before beginning the drilling operation. Cutting fluid is recommended for prolonged runs in hard materials even though this bit does not feature coolant-through passages.