Hertel 84580950 Jobber Drill Bit No. 21 Hss 135 Deg

Product Description

The HERTEL 84580950 is a high speed steel jobber-length drill bit sized to wire gauge No. 21, equivalent to 0.1590 inches in diameter. It features a 135-degree split point for fast penetration and reduced walking on entry, along with an oxide coating that provides basic lubricity and corrosion resistance during use. The overall length is 3.25 inches with a flute length of 2.125 inches. This bit is designed for heavy-duty holemaking in metal and other common trade materials. It is used by HVAC technicians, plumbers, electricians, and general tradespeople who need a reliable, standard-tolerance twist drill for everyday production drilling.

This jobber drill is suited for general-purpose holemaking applications in sheet metal, mild steel, aluminum, and similar materials. The No. 21 wire size is commonly used in trades for pilot holes, clearance holes, and tapping pre-drill operations where a 0.1590-inch diameter is specified. The straight cylindrical shank fits standard 3-jaw drill chucks on corded and cordless drills as well as drill presses. A regular spiral and tapered web configuration support chip evacuation in through-hole and blind-hole drilling scenarios.

Key Features

• 135-degree split point reduces thrust force and prevents bit walking on smooth surfaces
• Web-thinned, tapered web configuration promotes efficient chip clearing
• Oxide coating improves surface lubricity and light corrosion resistance
• Right-hand cutting spiral flute with 2-flute geometry for standard twist drilling
• Heavy-duty grade high speed steel construction for repeated use in production environments
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a standard jobber-length drill bit for use in any 3-jaw chuck accepting a 0.1590-inch straight cylindrical shank, including handheld drills and drill presses commonly used in HVAC, plumbing, and electrical trade applications.

Installation Notes

Installation and use should follow standard machine shop and trade safety practices. Secure the workpiece firmly before drilling and ensure the chuck is fully tightened before applying power. Use cutting fluid when drilling ferrous metals to extend bit life and improve hole quality. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.