Hertel 74130436 Screw Machine Drill Bit 1/2 in Cobalt

Product Description

The HERTEL 74130436 is a screw machine length drill bit designed for high-speed drilling in tough and abrasion-resistant materials. Built from cobalt high-speed steel (HSCO), this bit handles stainless steel, cast iron, titanium alloys, and other hard metals where standard HSS bits lose their edge. The 135-degree split point starts on contact without a center punch, reducing walking and improving hole accuracy. Overall length is 3.75 inches with a flute length of 2.25 inches, keeping the bit rigid and reducing deflection in short-reach drilling applications. The straight cylindrical shank fits standard drill chucks and quick-change holders.

This bit is suited for metalworking applications in maintenance, repair, and manufacturing environments. The screw machine length profile makes it well-matched to drill press work, CNC turret setups, and hand-held drilling on structural steel, fabricated assemblies, and equipment frames. HVAC, plumbing, and electrical tradespeople commonly use screw machine bits when drilling through hardware-grade steel, angle iron, or equipment panels where a jobber-length bit would flex or deflect. The two-flute regular spiral design clears chips efficiently during through-hole drilling.

Key Features

• Cobalt HSCO construction for drilling hard metals including stainless steel and cast iron
• 135-degree split point starts on contact and eliminates center-punching on most applications
• Web-thinned parallel web reduces cutting resistance and lowers thrust requirements
• Screw machine (stub) length provides added rigidity over jobber-length bits
• Right-hand cutting, regular spiral flute for reliable chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-style replacement or standard tooling selection for use in drill presses, CNC turret drilling machines, and hand-held drills with a 1/2-inch straight-shank chuck capacity.

Installation Notes

Installation and use of this drill bit should follow standard machining safety practices. Secure the workpiece fully before drilling and ensure the chuck is tightened with a chuck key before operation. Wear appropriate eye protection and ensure the drill press or power tool is powered down before changing bits. Use appropriate cutting fluid on hard metals to extend bit life and maintain cut quality.