Hertel 84580570 Jobber Drill Bit Letter J Hss 135 Deg

Product Description

The HERTEL 84580570 is a letter-size J jobber drill bit designed for general-purpose holemaking in metal, wood, and composite materials. It is manufactured from high speed steel with an oxide coating that reduces friction and provides basic corrosion resistance during storage and use. The split point geometry at 135 degrees reduces walking on entry and lowers thrust requirements compared to a conventional 118-degree point. With an overall length of 4.125 inches and a flute length of 2.875 inches, this bit fits standard three-jaw drill chucks in corded and cordless equipment used by machinists, pipefitters, electricians, and general trade professionals.

This drill bit is suited for production and maintenance drilling applications where a letter-size J hole is required. Common uses include drilling clearance holes for fasteners, preparing pilot holes before tapping, and general fabrication work in shop or field settings. The straight cylindrical shank at 0.2770 inches diameter seats in standard drill chucks without modification. The regular spiral flute design moves chips efficiently out of the hole during through-drilling operations in ferrous and non-ferrous stock.

Key Features

• 135-degree split point reduces bit walking and lowers feed pressure on entry
• High speed steel construction handles the heat and wear demands of repeated metal drilling
• Oxide coating provides a friction-reducing surface treatment and basic corrosion resistance
• Web-thinned tapered web improves chip clearance and reduces cutting resistance
• Two-flute regular spiral design for efficient chip evacuation in through-hole drilling
• Heavy duty grade designation per NAS specification

Compatibility

Designed as a jobber-series replacement drill bit for any standard drill chuck accepting a 0.2770-inch straight cylindrical shank, suitable for bench drills, drill presses, and hand-held power drills used in general metalworking and trade applications.

Installation Notes

Install in a keyed or keyless drill chuck and tighten securely before use. Secure the workpiece with a vise or clamps to prevent rotation during drilling. Use appropriate cutting fluid when drilling ferrous metals to extend bit life and improve hole finish. Inspect the cutting edges before each use and replace the bit if chipping or significant wear is observed.