Hertel 84578046 Jobber Drill Bit Letter T Hss

Product Description

The HERTEL 84578046 is a jobber-length drill bit in letter size T, designed for general-purpose drilling in metal, wood, and plastics. Built from high-speed steel with a bright, uncoated finish, this bit delivers consistent performance across a wide range of shop and field applications. The 118-degree standard point angle provides reliable centering on most materials without requiring a pilot hole. With an overall length of 4-7/8 inches and a flute length of 3-1/2 inches, it fits standard drill chucks and is a staple in any tradesperson's kit. The straight-cylindrical shank measures 0.3580 inches in diameter, matching the letter T drill size exactly.

This bit is suited for residential and light commercial work where a general-purpose jobber-length drill is needed. Typical applications include drilling clearance holes, pilot holes for fasteners, and through-holes in ferrous and non-ferrous metals, as well as thermoplastics and wood composites. The right-hand spiral flute design efficiently evacuates chips during drilling, reducing heat buildup and extending bit life. It is well suited for use in hand-held drills, drill presses, and CNC drill stations running standard speeds for HSS tooling.

Key Features

• Letter T size — 0.3580 inch decimal equivalent for precise hole sizing
• 118-degree standard point angle with web-thinned tip for easier starting
• High-speed steel construction rated for general-purpose drilling in metal, wood, and plastics
• Regular spiral, 2-flute design promotes efficient chip evacuation
• Straight-cylindrical shank fits standard 3-jaw drill chucks without adapters
• Bright uncoated finish — compatible with cutting fluids and standard HSS speeds

Compatibility

Designed as a general-purpose jobber-length drill bit suitable for use in standard 3-jaw drill chucks accepting straight-cylindrical shanks in the 0.3500 to 0.4000 inch size range.

Installation Notes

A licensed machinist or qualified tradesperson should verify spindle speed and feed rate are appropriate for the workpiece material before use. Secure the workpiece firmly and ensure the chuck is fully tightened on the shank before drilling. Apply cutting fluid when drilling steel or cast iron to extend tool life and reduce heat. Inspect the cutting edges for wear or chipping before each use and replace the bit if edge integrity is compromised.