Hertel 62748306 Jobber Drill 21/64 in 135 Deg Ticn Hss

Product Description

The HERTEL 62748306 is a high-speed steel jobber-length drill bit designed for general-purpose holemaking in metal and similar materials. It measures 21/64 inch (0.3281 inch) in diameter with a 4-5/8 inch overall length and a 3-5/16 inch flute length. The 135-degree split point reduces walking on contact and lowers the thrust required to start a hole without a center punch. A TiCN (titanium carbonitride) coating improves surface hardness and wear resistance compared to uncoated HSS, extending service life in production drilling applications. The straight cylindrical shank fits standard drill chucks without adapters.

This bit is suited for metalworking, maintenance, and fabrication environments where repeated holemaking in steel, aluminum, cast iron, or similar materials is required. The jobber-length profile balances reach and rigidity, making it a practical general-purpose choice for drill press, hand drill, and CNC drilling operations. The NAS specification designation indicates it meets a recognized aerospace and industrial standard, which is relevant in shop and MRO settings where dimensional and material consistency matter.

Key Features

• 135-degree split point reduces thrust and walking at hole entry
• TiCN coating increases surface hardness and wear resistance over uncoated HSS
• Regular spiral flute with web-thinned, tapered web for efficient chip evacuation
• Right-hand cutting direction, 2-flute configuration
• Straight cylindrical shank fits standard drill chucks directly
• Heavy-duty grade HSS construction; meets NAS specification

Compatibility

Designed as an OEM-style replacement or direct-fit jobber drill for any application requiring a 21/64 inch straight-shank drill bit within the 0.3000 to 0.3500 inch decimal inch size range.

Installation Notes

Drill bit installation and use should follow standard machining safety practices. Secure the shank firmly in a properly sized drill chuck and confirm runout is within acceptable limits before drilling. Ensure the workpiece is clamped or fixtured before starting the spindle. Wear appropriate eye protection and follow applicable shop safety codes when operating drilling equipment.