Hertel 74148958 19/64 in Carbide Screw Machine Drill Bit

Product Description

The HERTEL 74148958 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding workpiece materials. At 19/64 inch (0.2969 inches) in diameter, this bit features a 135-degree split point for fast, accurate entry with minimal walking. The slow spiral flute geometry and web-thinned, parallel web configuration make it well-suited for chip evacuation in tough materials. At 2.75 inches overall length, the screw machine format provides added rigidity compared to jobber-length bits, reducing deflection in short-hole applications. Installed by machinists and metalworking trades, it is a drop-in-ready tool for CNC machines, drill presses, and manual lathes.

This drill bit is intended for use in difficult-to-machine metals including cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. The solid carbide construction maintains cutting-edge integrity at elevated temperatures and feeds where high-speed steel bits would degrade. The right-hand cut and straight-cylindrical shank allow direct chuck mounting without adapters. It is a practical choice for production environments and job shop applications where consistent hole tolerance is required. Diameter tolerance is held to +0.0000 to -0.0005 inches for reliable fit in close-tolerance work.

Key Features

• Solid carbide construction for durability in hard and abrasive workpiece materials
• 135-degree split point reduces thrust and eliminates center-punch requirement on flat stock
• Slow spiral flute with web-thinned parallel web improves chip flow and reduces heat buildup
• Screw machine length (2.75 inches overall) provides rigidity and reduces deflection in short-hole drilling
• Bright/uncoated finish suitable for use with cutting fluids on ferrous and non-ferrous materials
• Diameter tolerance of +0.0000 to -0.0005 inches for consistent, repeatable hole sizing

Compatibility

Designed for use in cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel workpieces. Fits any standard drill chuck or collet accepting a straight-cylindrical shank in the 19/64 inch diameter range.

Installation Notes

This bit is installed by machinists and metalworking professionals in CNC machining centers, drill presses, and manual lathes. Secure the straight-cylindrical shank firmly in a properly sized collet or drill chuck before operation. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life and maintain hole quality. Inspect the cutting edges for chipping before each use, as carbide is brittle and sensitive to side loading or interrupted cuts.