Cle-line C23633 Aircraft Extension Drill Bit E 1/4 in

Product Description

The CLE-LINE C23633 is an aircraft extension drill bit sized at Letter E (0.2500 inches / 1/4 inches) with a 135-degree split point and a high-speed steel construction with an oxide finish. Designed for extended reach drilling in tight or deep-access applications, the C23633 features a spiral flute and web-thinned, tapered web configuration that promotes self-centering and reduces walking on entry. Overall length is 6 inches with a 2.75-inch flute length and a straight cylindrical shank. This bit suits production and MRO environments where precision hole placement and dimensional consistency are required.

The C23633 is part of CLE-LINE Series 1803 and is built for aircraft-style drilling applications where extended reach is needed beyond what a jobber-length bit provides. It is well suited for use in aerospace fabrication, sheet metal work, and structural drilling scenarios. Right-hand cutting direction and a straight 1/4 inch shank make it compatible with standard drill chucks and magnetic drill press adapters commonly used by sheet metal workers, maintenance technicians, and fabricators in industrial and commercial settings.

Key Features

• Letter E (1/4 inches / 0.2500 inches) diameter with tight tolerance: +0.0000 to -0.0007 inches
• 135-degree split point with self-centering geometry reduces drill walking
• Web-thinned tapered web improves chip clearance and reduces thrust
• Spiral flute design promotes efficient chip evacuation in deep or extended-reach holes
• Oxide finish provides mild corrosion resistance and reduces friction during cutting
• Conforms to ASME B94.11M standards for high-speed steel twist drills

Compatibility

Designed as an OEM-style general purpose aircraft extension drill bit compatible with standard 1/4 inch straight-cylindrical shank drill chucks and rotating drive tools used in sheet metal, fabrication, and MRO drilling applications.

Installation Notes

Installation and use should be performed by a qualified machinist, fabricator, or maintenance technician. Secure the straight cylindrical shank fully in a drill chuck before operation and confirm the bit runs true before engaging the workpiece. Always wear appropriate eye protection and secure the workpiece firmly to prevent movement during drilling. Follow applicable shop safety codes and manufacturer speed and feed recommendations for the material being drilled.