Hertel 84578699 Jobber Drill Bit Letter R Hss Tin 118

Product Description

The HERTEL 84578699 is a jobber-length drill bit sized to letter R (0.3390 inches), designed for general-purpose drilling in metal, wood, and plastics. The bit is manufactured from high speed steel with a titanium nitride (TiN) coating that reduces friction and extends cutting life compared to uncoated HSS. It features a 118-degree standard point angle, a web-thinned tapered web for easier entry and reduced thrust, and a two-flute spiral configuration for efficient chip evacuation. Overall length is 4-3/4 inches with a 3-7/16 inch flute length. It is sold individually and suited for use in production and maintenance environments by machinists, pipefitters, and general trade technicians.

This bit is a general-purpose jobber-length drill intended for use in hand-held drills, drill presses, and lathes. The straight-cylindrical shank at 0.3390 inches diameter seats securely in standard three-jaw chucks. The regular spiral and right-hand cut make it compatible with conventional drilling operations across a wide range of workpiece materials. Web thinning reduces the chisel edge to lower the force required at drill entry, which is particularly useful when drilling tougher alloys or stacked materials.

Key Features

• Letter R size: 0.3390 inches decimal equivalent
• TiN coating reduces friction and increases tool life over uncoated HSS
• 118-degree standard point angle for general-purpose material entry
• Web-thinned tapered web for lower thrust and cleaner drill entry
• Two-flute regular spiral geometry promotes efficient chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose jobber-length drill bit suitable for use in standard three-jaw drill chucks accepting a 0.3390-inch straight shank across benchtop drill presses, hand drills, and machining equipment.

Installation Notes

A licensed machinist or qualified tradesperson should verify chuck capacity before seating the shank. Secure the workpiece firmly before drilling and operate at a spindle speed appropriate for the workpiece material and bit diameter. Inspect the cutting edges and TiN coating for wear or chipping before each use; a damaged point should be reground or the bit replaced before continuing work.