Hertel 74130725 Size 20 Cobalt Screw Machine Drill Bit

Product Description

The HERTEL 74130725 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including stainless steel, hardened alloys, and abrasion-resistant metals. Built to wire gauge Size 20, it has a decimal diameter of 0.1610 inches and an overall length of 2.125 inches with a flute length of 1.0625 inches. The 135-degree split point reduces walking and allows the bit to self-center on contact without a pilot hole. The web-thinned, parallel-web construction lowers thrust requirements and extends tool life in production drilling environments. Licensed machinists, maintenance technicians, and metal fabricators typically reach for this bit in shop and field applications.

This bit is suited for production and general-purpose drilling in metalworking operations where shorter-than-jobber-length tools provide added rigidity and reduced deflection. The screw machine length body fits standard drill chucks and is well suited to drill presses, lathes, CNC mills, and hand-held power drills operating on metal workpieces. It is a practical choice for repetitive hole-making in close-tolerance work where a stable, rigid bit is required. The right-hand cutting direction and regular spiral flute geometry handle the majority of through-hole and blind-hole drilling scenarios encountered in light manufacturing and maintenance-repair work.

Key Features

• Cobalt construction for increased heat resistance and durability in hard metal drilling
• 135-degree split point self-centers on contact and reduces walking without a center punch
• Web-thinned parallel web lowers cutting thrust and extends tool life
• Screw machine length body provides greater rigidity and reduced deflection versus jobber-length bits
• Straight cylindrical shank fits standard drill chucks without adapters
• Right-hand, regular spiral flute geometry for efficient chip evacuation in through and blind holes

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for applications requiring a wire gauge Size 20 (0.1610 inch) screw machine length drill in standard straight-shank drill chucks across drill presses, lathes, CNC machines, and hand-held power tools.

Installation Notes

A licensed machinist or qualified technician should secure the shank fully in the drill chuck before operation and verify chuck runout is within acceptable tolerance for close-work drilling. Ensure the workpiece is firmly clamped or fixtured before beginning a cut. Use appropriate cutting fluid or coolant for the base material when extended drilling cycles are anticipated, as cobalt bits still generate heat in continuous-duty use. Inspect the split point for chipping before each use and replace the bit if edge damage is visible.