Hertel 84581339 No. 59 Jobber Drill Bit 135 Deg Hss

Product Description

The HERTEL 84581339 is a wire gauge jobber-length drill bit sized at No. 59 (0.0410 inches decimal equivalent) for precision small-diameter holemaking. Manufactured from high speed steel (HSS) with an oxide coating to reduce friction and extend tool life, this bit features a 135-degree split point that starts on contact without a center punch, reducing walk on hard or coated surfaces. The tapered web and web-thinned geometry lower cutting torque, making it well suited for production drilling in metal fabrication, HVAC, electrical, and plumbing trade applications where small pilot or clearance holes are required.

This bit is intended for use in hand drills, drill presses, and CNC or manual machine tool setups where a straight-cylindrical shank is appropriate. Its jobber-length overall length of 1-5/8 inches provides the right balance of rigidity and reach for general-purpose through-hole and blind-hole work in mild steel, aluminum, copper, brass, and similar materials. Trade professionals in HVAC sheet metal, electrical panel work, and plumbing rough-in commonly use wire gauge bits in this size range for screw clearance holes and pilot drilling.

Key Features

• No. 59 wire size, 0.0410 inches decimal diameter for precise small-bore holemaking
• 135-degree split point starts on contact, no center punch required
• High speed steel construction with oxide coating for reduced friction and heat buildup
• Tapered web with web-thinned geometry lowers cutting torque
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• NAS specification designation indicating heavy-duty grade conformance

Compatibility

Designed as a general-purpose jobber-length drill bit for use in any drill press, hand drill, or machine tool accepting a straight-cylindrical shank in the 0.0410-inch diameter range.

Installation Notes

Secure the shank fully in the drill chuck before operation and verify chuck key is removed before starting the tool. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life and maintain hole quality. Wear ANSI-rated eye protection during all drilling operations. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is damaged.