Precision Twist Drill 6001272 Drill Bit Letter D Hss

Product Description

The PRECISION TWIST DRILL 6001272 is a Letter D aircraft extension drill bit engineered for professionals who need extra reach in tight or deep-bore applications. Built from high-speed steel with an oxide finish, it features a 135-degree split point that is self-centering and reduces walking on entry, making it well suited for production drilling and field repair work. The spiral flute geometry with a web-thinned, tapered web configuration promotes efficient chip evacuation. At 6 inches overall length with a 2.75-inch flute length, this bit delivers the extended reach required for aircraft-style drilling tasks without sacrificing rigidity.

This drill bit is intended for use by machinists, aircraft maintenance technicians, and metalworking tradespeople drilling through steel, aluminum, and similar materials where a standard-length bit cannot reach. The 4xD flute-to-diameter ratio supports stable cutting in moderate-depth holes. Its straight cylindrical shank seats in standard drill chucks without adapters. The two-flute right-hand cutting configuration is appropriate for general-purpose through-hole and blind-hole drilling in metal fabrication, MRO, and structural repair scenarios.

Key Features

• Letter D (0.2460 inch) diameter with matching straight cylindrical shank diameter of 0.2460 inch
• 135-degree split point is self-centering and reduces drill walk on hard surfaces
• Web-thinned tapered web lowers thrust requirements and improves chip flow
• High-speed steel construction with oxide finish for heat and wear resistance
• 6-inch overall length with 2.75-inch spiral flute for extended-reach applications
• Meets NAS 907 Type B standards for aircraft-grade drilling applications

Compatibility

Designed as a general-purpose aircraft extension drill bit suitable for use with standard drill chucks accepting a 0.2460-inch straight cylindrical shank in metalworking, MRO, and aircraft maintenance applications.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with cutting tool safety. Secure the workpiece fully before drilling and ensure the drill chuck is properly tightened on the shank. Use appropriate cutting fluid for the material being drilled to extend tool life and control heat. Follow applicable workplace safety standards and any relevant NAS or OEM maintenance manual procedures when performing aircraft structural work.