Precision Twist Drill 6001265 Letter C Hss Extension Drill

Product Description

The PRECISION TWIST DRILL 6001265 is a Letter C (0.242 inch diameter) high speed steel aircraft extension drill bit designed for deep-hole drilling applications where standard-length bits cannot reach. Built to NAS 907 Type B standards, it features a 135-degree split point with web thinning for self-centering starts and reduced feed pressure. The oxide finish provides light corrosion resistance during storage and use. With a 2.75-inch flute length and a 6-inch overall length, this bit gives tradespeople and aerospace maintenance technicians the reach needed on structural and sheet-metal work without requiring a separate extension.

This drill bit is suited for use on aircraft structures, sheet metal assemblies, and general-purpose metal fabrication where extended reach is required. The straight-cylindrical shank at 0.242 inches accommodates standard drill chucks. The right-hand spiral flute geometry evacuates chips efficiently in through-hole and blind-hole applications. It is commonly installed by aviation maintenance technicians, sheet metal workers, and industrial machinists working in confined or deep-reach drilling scenarios.

Key Features

• Letter C sizing at 0.242 inch diameter with straight-cylindrical shank of matching diameter
• 135-degree split point with web thinning promotes self-centering and reduces walking on hard surfaces
• NAS 907 Type B standard compliance for aircraft and structural drilling applications
• 2.75-inch flute length in a 6-inch overall body provides extended reach in tight spaces
• High speed steel construction with oxide finish for general-purpose metal cutting
• Two-flute right-hand spiral geometry with tapered web for efficient chip evacuation

Compatibility

Designed as an OEM-style replacement and general-purpose fit for standard drill chucks accepting a 0.242-inch straight-cylindrical shank, consistent with Series 502-6 aircraft extension drill specifications.

Installation Notes

Installation is performed by machinists, sheet metal workers, or aviation maintenance technicians using a standard keyed or keyless drill chuck rated for the shank diameter. Ensure the chuck is fully tightened before operation and that the workpiece is securely clamped. Use appropriate cutting fluid for the material being drilled to extend tool life and maintain hole tolerance. Always wear eye protection and follow applicable shop safety procedures when operating drill equipment.