Hertel 74148917 Drill Bit Letter E Solid Carbide 135 Deg

Product Description

The HERTEL 74148917 is a screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Built from solid carbide grade C2, this bit measures 0.2500 inches in diameter (Letter E) with a 2.5-inch overall length and a 1.375-inch flute length. The 135-degree split point reduces thrust on entry and minimizes walking, while the slow spiral flute geometry promotes chip evacuation in tough materials. It ships bright and uncoated with a parallel web and web-thinned geometry for consistent cutting performance. Licensed HVAC techs, machinists, and metalworking professionals use this bit in precision drilling applications where dimensional accuracy and tool life matter.

This drill bit is suited for drilling cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel. The screw machine length - shorter than jobber length - provides added rigidity and reduced deflection in CNC machining centers, drill presses, and manual operations where stub-length tooling is specified. The straight cylindrical shank seats securely in standard drill chucks and collets. It is part of the HERTEL HSSC135-SS series, which targets stainless and specialty alloy applications where standard HSS bits fail prematurely.

Key Features

• Solid carbide C2 grade construction for extended tool life in hard and abrasive materials
• 135-degree split point reduces entry thrust and prevents bit walking on curved or hardened surfaces
• Slow spiral flute design promotes chip clearance when drilling stainless steel, nickel alloys, and titanium
• Web-thinned parallel web lowers cutting resistance and improves penetration rate
• Screw machine (stub) length adds rigidity and reduces deflection versus jobber-length bits
• Bright uncoated finish maintains dimensional accuracy without coating buildup on cutting edges

Compatibility

Designed as a stub-length replacement or primary tooling option for applications in cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. Part of the HERTEL HSSC135-SS series for specialty alloy drilling.

Installation Notes

This bit is installed by machinists or tooling technicians in drill presses, CNC machining centers, or hand-operated drill equipment with a compatible chuck or collet sized for a straight cylindrical shank. Ensure the spindle is fully stopped and de-energized before bit changes. Use appropriate cutting fluid or coolant for stainless and titanium applications even though this bit does not feature through-coolant capability. Verify chuck runout and shank seating before operating to maintain the stated diameter tolerance of plus 0.0000 to minus 0.0005 inches.