Hertel 01778190 Cobalt Drill Bit 1/4 in 135 Pt 1/4-28

Product Description

The HERTEL 01778190 is a cobalt threaded shank drill bit designed for drilling into high-tensile strength materials where standard HSS bits fall short. It carries a 135-degree split point geometry that reduces walking on entry and lowers required thrust, making it a practical choice for production and maintenance drilling alike. The oxide coating provides surface hardness and mild lubricity. At 2.125 inches overall length with a 1.125-inch flute, this is a compact drill intended for close-quarters work where a standard-length bit would not fit. Cutting direction is right-hand with a regular spiral flute and web-thinned, tapered web configuration for cleaner chip evacuation.

This bit is suited for use on high-tensile alloys, stainless, and hard steels encountered in HVAC fabrication, sheet metal structural work, mechanical assembly, and maintenance repair operations. The 1/4-28 threaded shank is designed to engage threaded quick-change or locking chuck adapters, making it especially useful on dedicated drill fixtures and precision drilling setups. The NAS 965 specification number indicates conformance to aerospace and industrial drilling standards. Installers and machinists working on equipment supports, brackets, and structural attachments in commercial and industrial environments will find this bit fits standard threaded adapters used across those trades.

Key Features

• Cobalt construction for drilling high-tensile strength and hard alloy materials
• 135-degree split point reduces drill walking and lowers entry thrust
• Web-thinned tapered web improves chip evacuation and reduces heat buildup
• 1/4-28 threaded shank for use with threaded quick-change chuck adapters
• Oxide coating adds surface hardness and mild lubricity
• Compact 2.125-inch overall length suited for restricted-access drilling
• Meets NAS 965 specification for industrial and aerospace-grade applications

Compatibility

Designed for use with 1/4-28 threaded shank drill adapters and fixtures in industrial, mechanical, and trade drilling applications involving high-tensile strength materials.

Installation Notes

Installation of this drill bit requires a compatible 1/4-28 threaded chuck adapter or drill fixture. Secure the threaded shank fully before operation to prevent slippage under load. Always wear appropriate eye protection and secure the workpiece before drilling. Follow applicable shop safety procedures and equipment manufacturer guidelines when operating drill presses or hand drills at speeds appropriate for cobalt bits in hard materials.