Hertel 74130451 Screw Machine Drill Bit 17/32 in Cobalt

Product Description

The HERTEL 74130451 is a screw machine length drill bit designed for high-production drilling in stainless steel and tough alloys. Built from cobalt high-speed steel (HSCO), it maintains cutting hardness under the elevated heat generated when boring into work-hardening and abrasion-resistant materials. The bit measures 17/32 inch (0.5313 inch) in diameter with a 135-degree split point that self-centers on contact and reduces the thrust needed to start a hole. Overall length is 3-7/8 inches, making it suited to close-quarters and screw machine setups where a shorter flute column improves rigidity and straightness. Licensed machinists, tool-and-die technicians, and maintenance mechanics are the primary installers.

This bit is used in screw machine operations, drill press setups, and manual machining applications involving stainless steel, nickel alloys, titanium alloys, and other tough workpiece materials. The shorter-than-jobber body length reduces deflection during deep-feed passes. The 2-3/8-inch flute length provides adequate chip clearance for the material thicknesses common to these applications. The right-hand cutting direction and regular spiral flute geometry support standard clockwise spindle rotation on conventional machine tools.

Key Features

• Cobalt HSS construction retains hardness at elevated cutting temperatures in stainless and tough alloys
• 135-degree split point self-centers and lowers axial thrust at hole entry
• Web-thinned parallel web reduces cutting resistance and improves chip evacuation
• Screw machine length body improves rigidity and minimizes deflection versus jobber-length bits
• Straight cylindrical shank fits standard drill chucks and collet holders without modification
• Straw finish (Series HSCO135) indicates heat-treated cobalt alloy without an additional coating layer

Compatibility

Designed as an OEM-style replacement or direct substitute for screw machine length cobalt drill bits in the 0.5000 to 0.6000 inch decimal inch size range, compatible with standard drill chucks and collet systems accepting a straight cylindrical shank of this diameter.

Installation Notes

Installation is performed by qualified machinists or maintenance mechanics using a drill press, CNC machining center, or manual screw machine with a compatible chuck or collet. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Secure the shank fully in the chuck or collet to the recommended grip depth to prevent slippage under load. Coolant-through is not supported on this bit, so apply cutting fluid externally when drilling stainless steel or tough alloys to manage heat and extend tool life.