Hertel 74130998 Screw Machine Drill Bit Size 47 Cobalt

Product Description

The HERTEL 74130998 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials. Built to wire gauge size 47 with a decimal equivalent of 0.0785 inches, this bit features a 135-degree split point that reduces walking and allows self-centering entry without a center punch. The web-thinned, parallel web construction lowers thrust requirements at the cutting edge. At 1.75 inches overall length with a 0.75-inch flute length, the stub-length body provides added rigidity, reducing deflection in short-reach drilling applications. Machinists, tool-and-die workers, and maintenance technicians are the primary users.

Screw machine length drill bits are well suited for CNC machining centers, drill presses, and hand-held power tools where a short, stiff drill is needed to maintain hole accuracy. The Size 47 diameter is common in precision tapping operations, electrical component mounting, and light sheet metal work. The cobalt construction handles work-hardened steels, stainless, and other abrasion-resistant alloys that would prematurely dull standard HSS tooling. This bit ships individually but requires purchase in multiples of 12 per the manufacturer minimum order policy.

Key Features

• Cobalt construction for extended tool life in hard and work-hardened materials
• 135-degree split point reduces bit walking and lowers entry thrust
• Web-thinned parallel web minimizes cutting resistance
• Stub screw machine length (1.75 inches OAL) adds rigidity and reduces deflection
• Right-hand cut, regular spiral flute for standard chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a standard straight-shank screw machine length drill bit compatible with any drill press, CNC spindle, or hand-held drill accepting a straight shank at the 0.0785-inch diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with cutting tool safety practices. Secure the shank fully in the chuck and verify runout before drilling. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting this bit does not support coolant-through delivery.