Hertel 83238956 Screw Machine Drill Bit Letter Z Hss

Product Description

The HERTEL 83238956 is a screw machine length drill bit sized to Letter Z (0.4130 inches decimal equivalent) and designed for high-production drilling in metal fabrication, machining, and maintenance applications. Built from high-speed steel with an oxide coating, the bit features a 135-degree split point that reduces walking and lowers thrust requirements at entry. The shorter screw machine length body improves rigidity over jobber-length alternatives, making it well suited to drill press, CNC turret, and hand-held power tool use where stub stiffness is needed. The right-hand spiral flute with web-thinned, parallel web geometry promotes efficient chip evacuation and cleaner hole walls in ferrous and non-ferrous materials.

This drill bit is appropriate for production drilling environments where Letter Z diameter holes are required without reaming as a follow-on operation. Typical applications include through-hole drilling in steel plate, structural components, and machine housings. The straight-cylindrical shank (0.4130 inches diameter) seats directly in standard drill chucks across a wide range of machine tooling. The 2-inch flute length and 3.375-inch overall length are dimensioned to NAS 907 specification, making it a recognized interchange for shops sourcing to that standard.

Key Features

• Letter Z size — 0.4130 inches decimal equivalent, within the 0.4000 to 0.4500 inch range
• 135-degree split point reduces bit walking and cutting thrust at entry
• Web-thinned parallel web improves chip flow and reduces heat buildup
• High-speed steel construction with oxide coating for wear resistance on ferrous materials
• Screw machine (stub) length body increases rigidity compared to jobber-length bits
• Meets NAS 907 specification for shops with interchangeability requirements

Compatibility

Designed as an OEM-style screw machine length drill bit compatible with standard drill chucks and toolholders accepting a 0.4130-inch straight-cylindrical shank, conforming to NAS 907 specification.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Secure the straight-cylindrical shank fully in the drill chuck and verify runout before drilling. Always wear appropriate eye protection and secure the workpiece before starting the spindle. Do not exceed the recommended surface footage for high-speed steel tooling in the material being drilled, and allow the bit to clear chips regularly to prevent heat buildup and premature wear.