Precision Twist Drill 6001280 1/2 in Hss Extension Drill

Product Description

The PRECISION TWIST DRILL 6001280 is a high speed steel aircraft extension drill bit designed for deep-hole drilling in metal fabrication, aerospace maintenance, and industrial applications. Built to Series 500-6 standards, it features a 135-degree split point that is self-centering, reducing the need for a center punch on most materials. The 0.5-inch diameter pairs with a 4.5-inch flute length, giving the bit extended reach into confined or deep cavities while maintaining cutting performance on ferrous and non-ferrous metals. The oxide finish provides a degree of surface hardness and lubricity suited to general-purpose production drilling.

This extension drill is intended for use in applications where standard-length bits cannot reach the workpiece, such as drilling through structural members, thick stock, or assemblies where clearance is limited. It is commonly used in aviation maintenance, heavy equipment repair, and industrial fabrication shops. The spiral flute geometry promotes chip evacuation during extended cuts. The straight-cylindrical shank seats in standard drill chucks without modification, making it compatible with common corded and pneumatic drills used in trade and shop environments.

Key Features

• 135-degree split point is self-centering and reduces walking on entry
• 4.5-inch flute length provides extended reach for deep or obstructed drilling locations
• High speed steel construction handles general-purpose metal drilling at standard feed and speed rates
• Oxide finish improves surface lubricity and reduces friction during cutting
• Straight-cylindrical shank fits standard drill chucks without adapters
• Web-thinned tapered web reduces thrust required during drilling
• Right-hand cutting, 2-flute spiral design promotes chip clearance in deep holes

Compatibility

Designed as an OEM-style replacement or direct-use aircraft extension drill bit for general-purpose metal drilling applications meeting NAS 907 Type B standards.

Installation Notes

Installation and use should be performed by qualified machinists, maintenance technicians, or trade professionals familiar with metal drilling procedures. Secure the workpiece and ensure the drill chuck is properly tightened before operation. Select appropriate cutting speed and feed rate for the material being drilled to avoid overheating the bit or work surface. Eye protection and appropriate PPE should be worn at all times during drilling operations.