Hertel 74149030 Screw Machine Drill Bit 27/64 Solid Carbide

Product Description

The HERTEL 74149030 is a screw machine length drill bit designed for high-performance drilling in demanding materials. Built from solid carbide with a bright/uncoated finish, this bit measures 27/64 inch (0.4219 inches) in diameter and features a 135-degree split point that reduces walking and improves hole entry accuracy. The slow spiral flute geometry controls chip evacuation and maintains cutting pressure in tough substrates. At 3-3/8 inches overall length with a 2-inch flute length, this stub-length format provides added rigidity compared to jobber-length bits, making it well suited for production drilling and precision machining work.

This drill bit is engineered for machining cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel. Its screw machine length profile fits standard drill press chucks and CNC machining center spindles, and the straight cylindrical shank ensures consistent runout in collet or keyless chuck setups. The web-thinned, parallel web configuration reduces thrust requirements, which is critical when boring into hard or work-hardening alloys. This bit is typically purchased by machinists, tool and die shops, and metalworking trades for repetitive production drilling cycles.

Key Features

• Solid carbide construction for superior hardness and heat resistance in ferrous and exotic alloys
• 135-degree split point reduces drill walk and lowers entry thrust force
• Slow spiral flute design promotes chip control in deep-hole and interrupted cuts
• Web-thinned parallel web reduces cutting resistance in hard materials
• Straight cylindrical shank compatible with standard drill chucks and collets
• Diameter tolerance held to +0.0000 to -0.0005 inches for precision hole sizing

Compatibility

Designed for use in cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel workpieces. Fits any drill press, CNC machining center, or hand drill with a chuck capacity accepting a 27/64 inch straight cylindrical shank.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or metalworking technicians familiar with carbide tooling. Ensure the machine spindle and chuck are clean and free of debris before seating the shank to maintain concentricity. Carbide tooling is brittle and susceptible to chipping under side-loading or impact; do not use in handheld impact drivers. Follow machine manufacturer guidelines and applicable shop safety codes when setting speeds and feeds for carbide drill bits.