Hertel 74130741 Cobalt Screw Machine Drill Bit Size 22

Product Description

The HERTEL 74130741 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including stainless steel, hardened alloys, and heat-resistant metals. Built to Series HSCO135, it features a 135-degree split point for fast penetration and reduced walking on entry, eliminating the need for a center punch in most applications. The 2-flute regular spiral flute design clears chips efficiently in short-hole drilling operations. At 2.125 inches overall length, the screw machine format provides added rigidity compared to jobber-length bits, making it well suited for CNC machining centers, drill presses, and hand-held drilling in constrained work envelopes. Licensed machinists, tool-and-die tradespeople, and industrial maintenance mechanics are the primary users.

This bit is intended for drilling operations where standard jobber-length bits lack rigidity or where stub-length reach is preferred. The wire gauge size 22 corresponds to a decimal diameter of 0.1570 inches, placing it in the 0.1500 to 0.2000 inch size range. Right-hand cutting direction pairs with standard right-hand spindle rotation. The straight cylindrical shank seats directly into drill chucks without an adapter. The straw finish indicates the cobalt steel was heat-treated and left bright for easy wear inspection during service life. Web thinning with a parallel web configuration reduces thrust requirements at the cutting edge.

Key Features

• Cobalt high-speed steel (HSCO) construction for heat and wear resistance in hard materials
• 135-degree split point reduces thrust load and eliminates bit walking on entry
• Screw machine length at 2.125 inches overall provides superior rigidity over jobber-length bits
• Web-thinned parallel web reduces cutting force requirements
• Regular 2-flute spiral flute geometry promotes efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a wire gauge size 22 screw machine length drill bit with a straight cylindrical shank, compatible with standard drill chucks on CNC machining centers, drill presses, and handheld drills accepting bits in the 0.1500 to 0.2000 inch diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance mechanics familiar with cutting tool safety practices. Secure the shank fully in the drill chuck and verify concentricity before operation. Always power down and lock out the spindle before changing or inspecting bits. Follow applicable shop safety standards and wear appropriate eye and hand protection during drilling operations.