Cleveland C13142 Aircraft Extension Drill Bit Size 20 Hss

Product Description

The CLEVELAND C13142 is an aircraft extension drill bit designed for precision drilling in aerospace, sheet metal, and structural fabrication applications. Built from high-speed steel with a bright uncoated finish, this bit features a 135-degree split point with web thinning for self-centering starts and reduced walking on curved or coated surfaces. The bit measures 0.1610 inches in diameter (wire size 20) with a 6-inch overall length, giving technicians the reach needed for confined or deep-access drilling scenarios. Two spiral flutes with a tapered web configuration channel chips efficiently and help maintain cutting speed through ferrous and non-ferrous materials. Conforms to NAS 907 Type B standards.

This bit suits general-purpose drilling tasks in aircraft assembly, structural steel, and sheet metal work where standard-length bits lack sufficient reach. The straight cylindrical shank seats directly in standard drill chucks without an adapter. Right-hand cutting direction is the industry norm for most rotary drilling equipment. The extended 6-inch body is especially useful when drilling through deep structural members, inside panels, or through stacked material layers where access is limited by surrounding structure.

Key Features

• Wire size 20 diameter at 0.1610 inches with a tight tolerance of +0.0000 to -0.0007 inches
• 135-degree split point with web thinning provides self-centering entry and reduces thrust requirements
• 6-inch overall length delivers extended reach for confined and deep-access drilling
• High-speed steel construction handles ferrous and non-ferrous materials at general-purpose cutting speeds
• Spiral flute geometry with tapered web configuration promotes efficient chip evacuation
• Conforms to NAS 907 Type B for aerospace and precision manufacturing environments

Compatibility

Designed as a general-purpose aircraft extension drill bit conforming to NAS 907 Type B, compatible with standard straight-shank drill chucks used in handheld drills, drill presses, and pneumatic drilling equipment.

Installation Notes

Installed by machinists, aircraft maintenance technicians, or sheet metal workers using standard rotary drilling equipment. Secure the straight cylindrical shank firmly in a keyed or keyless chuck before operation. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Use appropriate cutting fluid or lubrication when drilling harder alloys or stacked materials to extend bit life and maintain dimensional accuracy.