Hertel 74149097 Screw Machine Drill Bit 3/4 in Carbide

Product Description

The HERTEL 74149097 is a screw machine length drill bit built for demanding metal-cutting applications. At 3/4 inch in diameter with a 5-inch overall length and a 3-1/8-inch flute length, this bit is designed for short, rigid setups where overhang and deflection need to be minimized. The 135-degree split point reduces walking and axial thrust at entry, and the slow spiral flute geometry promotes chip control when cutting hard, work-hardening materials. Manufactured from solid carbide at a C2 material grade, this bit delivers the edge retention needed in production and job-shop environments. It carries a bright, uncoated finish and ships individually.

This drill bit is intended for use in CNC machining centers, drill presses, and rigid manual setups where screw machine length tooling is specified. Primary target workpiece materials include cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel. The slow spiral flute type is matched specifically to these tough materials, where standard helix angles tend to grab or chatter. It belongs to the HSSC135-SS series and is appropriate for machinists, toolroom technicians, and maintenance shops working in aerospace, industrial, and heavy-equipment applications. Sold as a single unit.

Key Features

• Solid carbide construction at C2 material grade for hardness and edge retention in ferrous and exotic alloys
• 135-degree split point reduces thrust force and eliminates center walking on entry
• Slow spiral flute geometry optimized for cast iron, stainless steel, nickel alloy, titanium alloy, and tool steel
• Web-thinned parallel web configuration reduces cutting resistance
• Screw machine length (5 inches OAL) provides rigidity and minimizes deflection in short-reach setups
• Straight cylindrical shank fits standard drill chucks and collet holders without modification
• Diameter tolerance held to +0.0000 to -0.0005 inches for precision bore sizing

Compatibility

Designed as a screw machine length replacement or production drill bit compatible with standard straight-shank toolholders, drill chucks, and collets accepting 3/4-inch diameter shanks. Part of the HERTEL HSSC135-SS series.

Installation Notes

Installation and use should be performed by a qualified machinist or toolroom technician. Secure the shank fully in a calibrated chuck or collet and verify runout before cutting. Power down and de-energize the machine spindle before loading or unloading the bit. Do not exceed the recommended cutting parameters for the workpiece material, and use appropriate coolant strategy even though this bit does not have through-coolant capability.