Hertel 74148933 Screw Machine Drill Bit 7mm Carbide

Product Description

The HERTEL 74148933 is a solid carbide screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to Series HSSC135-SS specifications, it features a 135-degree split point that reduces walking and minimizes entry burr without a center punch. The slow spiral flute geometry controls chip evacuation in deep-hole applications. At 7.00 mm (0.2756 inches) in diameter with a bright/uncoated finish and web-thinned parallel web configuration, this bit delivers clean, accurate holes in demanding production and maintenance environments. It is installed by machinists, tool-and-die professionals, and maintenance mechanics.

This drill bit is rated for use in cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. The screw machine length format - shorter overall length than jobber bits - provides added rigidity and reduced deflection when drilling in tough alloys on drill presses, CNC machining centers, and manual mills. It is well suited for production shops, aerospace MRO, and industrial maintenance applications requiring tight hole tolerances in hard stock.

Key Features

• Solid carbide construction (Material Grade C2) for rigidity and wear resistance in hard materials
• 135-degree split point reduces thrust force and eliminates center-punch requirement
• Slow spiral flute design controls chip flow in cast iron, stainless steel, and titanium alloy
• Web-thinned parallel web reduces cutting resistance at entry
• Bright/uncoated finish - no coating buildup concerns on close-tolerance holes
• Diameter tolerance held to +0.0000 to -0.0005 inches for precise fit

Compatibility

Designed as a screw machine length replacement drill bit for applications requiring a 7.00 mm straight-shank carbide bit rated for cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. Falls within the 6.50 to 8.00 mm drill bit size range of the HSSC135-SS series.

Installation Notes

Installation is performed by machinists or maintenance mechanics using a drill press, machining center, or compatible hand drill with a chuck rated for straight-shank tooling. Secure the shank fully in the chuck and verify runout before drilling. Solid carbide is brittle - avoid side-loading, interrupted cuts without proper feed control, or using the bit as a reamer. Follow your machine tool manufacturer feed and speed recommendations for the specific workpiece material.