Hertel 74130857 Cobalt Screw Machine Drill Bit Size 33

Product Description

The HERTEL 74130857 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including stainless steel, high-temperature alloys, and hardened steels. Built to wire gauge Size 33, the cutting diameter measures 0.1130 inches. The 135-degree split point reduces walking on entry and lowers thrust requirements compared to a conventional 118-degree point. At 1-7/8 inches overall length with a 7/8-inch flute length, this stub-length geometry provides added rigidity in short-reach drilling operations. It is installed and used by machinists, tool-and-die technicians, and maintenance mechanics working on production and repair applications.

This drill bit is suited for screw machine operations, CNC drilling centers, drill presses, and hand drilling fixtures where a short, stiff bit reduces deflection and chatter. The regular spiral flute and parallel web configuration promote consistent chip evacuation in ferrous and non-ferrous materials. The straw finish indicates a heat-treated cobalt substrate without an additional coating, maintaining sharp cutting geometry through the full tool life. Applications include drilling in structural steel, cast iron, and stainless steel components in industrial and mechanical service environments.

Key Features

• Cobalt high-speed steel (HSCo) construction for heat and wear resistance in hard materials
• 135-degree split point reduces thrust and self-centers on entry without a center punch
• Screw machine (stub) length provides greater rigidity and reduced deflection versus jobber-length bits
• Web-thinned parallel web lowers cutting resistance and extends tool life
• Right-hand cut with regular spiral flute for standard drilling applications
• Straight cylindrical shank compatible with standard drill chucks and collet holders

Compatibility

Designed as an OEM-style replacement or direct-fit drill bit for any drill press, screw machine, or CNC machining center equipped with a standard straight-shank chuck or collet accepting a 0.1130-inch diameter shank.

Installation Notes

Installation and operation should be performed by qualified machinists or maintenance mechanics familiar with cutting tool safety. Secure the shank fully in the chuck or collet and verify runout before starting the spindle. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, even though this bit does not have through-coolant capability. Inspect the split point for damage or dulling before each use and replace the bit if cutting edge integrity is compromised.