Hertel 74148883 7/32 Inch Carbide Screw Machine Drill Bit

Product Description

The HERTEL 74148883 is a screw machine length drill bit designed for precision drilling in hard and abrasive materials. Built from solid carbide grade C2, this bit measures 7/32 inch (0.2188 inches) in diameter with a 135-degree split point that reduces walking and minimizes the need for a center punch. The web-thinned, parallel-web construction lowers thrust requirements at entry. With a slow spiral flute geometry and a 1.25-inch flute length, it is suited for controlled chip evacuation in dense workpieces. Machinists and toolroom techs working in production or job-shop environments are the primary installers of this bit.

This drill bit is engineered for demanding workpiece materials including cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. Its short, rigid screw machine length body reduces deflection during deep-entry passes, making it a practical choice for CNC machining centers, drill presses, and turret lathes where chatter and runout control are critical. The bright uncoated finish keeps the carbide substrate exposed for direct heat dissipation without coating buildup concerns. No coolant-through capability is present, so external coolant or cutting fluid application at the workpiece is standard practice for heat-sensitive materials.

Key Features

• Solid carbide C2 grade construction for hardness and wear resistance in ferrous and exotic alloys
• 135-degree split point reduces thrust and eliminates center-punch requirements on flat stock
• Web-thinned parallel web lowers entry force in hard materials
• Slow spiral flute promotes controlled chip evacuation in cast iron and stainless steel
• Bright uncoated finish suitable for use with a wide range of cutting fluids
• Straight cylindrical shank fits standard drill chucks and collet holders without modification

Compatibility

Designed as a screw machine length replacement drill bit for CNC machining centers, drill presses, and turret lathes accepting a straight cylindrical shank in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

Installation and use should be performed by qualified machinists familiar with carbide tooling and the specific feed and speed requirements of the workpiece material. Ensure the spindle and chuck or collet are fully powered down and locked out before changing tooling. Carbide is brittle and can fracture under interrupted cuts or excessive lateral load, so verify workholding rigidity before running. External cutting fluid is recommended when drilling stainless steel, nickel alloy, or titanium alloy to manage heat buildup at the cutting edge.