Hertel 89322143 Screw Machine Drill Bit Letter H Hss

Product Description

The HERTEL 89322143 is a screw machine length drill bit sized to Letter H (0.2660 inches, or 17/64 inches) and designed for general-purpose metal drilling in production and maintenance environments. The shortened overall length of 2-11/16 inches gives this stub-style bit greater rigidity than a jobber-length counterpart, reducing deflection and improving hole accuracy in tight clearance situations. Ground from high-speed steel with a bright, uncoated finish, the bit features a standard 118-degree split-free point geometry suited to a wide range of common ferrous and non-ferrous materials. Licensed HVAC technicians, machinists, and maintenance mechanics routinely reach for screw machine bits when working close to a surface or inside equipment cabinets.

This bit is well suited for drilling on drill presses, CNC turret drilling heads, and handheld power drills where a short, stiff tool is preferred over a full-length jobber bit. Typical applications include sheet metal work, light structural steel, aluminum stock, and general fabrication tasks. The right-hand cutting direction is standard for conventional clockwise-rotating spindles. With a 1-1/2 inch flute length and a decimal size of 0.2660 inches, the 89322143 fits within the 0.2500 to 0.3000 inch size range commonly required for tapping and clearance hole work in trade settings.

Key Features

• Letter H size: 0.2660 inches (17/64 inches) decimal diameter for precise hole sizing
• Screw machine (stub) length at 2-11/16 inches overall for added rigidity and reduced deflection
• 118-degree point angle for general-purpose drilling across common metals
• High-speed steel construction provides good wear resistance without coatings
• Right-hand cut for use with standard clockwise-rotating drill spindles
• Bright, uncoated finish allows easy visual inspection of cutting edge condition

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard 3-jaw drill chucks and turret drill heads accepting round-shank bits in the 0.2500 to 0.3000 inch diameter range.

Installation Notes

A licensed machinist or qualified maintenance technician should install this bit into a properly sized drill chuck, ensuring the shank is fully seated and the chuck is tightened before operation. Disengage power to any machine tool before changing bits. Use appropriate cutting fluid or coolant when drilling hardened or thick stock to extend cutting edge life and maintain hole tolerance.