Cleveland C13241 Aircraft Extension Drill Bit 30 Hss

Product Description

The CLEVELAND C13241 is a wire gauge size 30 aircraft extension drill bit designed for deep-reach drilling applications in aerospace, structural, and general metalworking environments. Built from high-speed steel with a bright uncoated finish, it features a 135-degree split point that is self-centering and reduces walking on entry without a center punch. The overall length of 12 inches provides the extended reach required for drilling in confined airframes, structural assemblies, and sheet metal stacks where standard-length bits cannot reach. Licensed HVAC, sheet metal, and aircraft maintenance technicians regularly use extension bits of this type when access depth exceeds standard tooling limits.

This bit is suited for use in light metals, aluminum sheet, and mild steel in both production and maintenance settings. The 12-inch overall length makes it particularly valuable for through-panel drilling in aircraft fuselage skins, structural ribs, and deep-cavity assemblies. It is also used in HVAC ductwork fabrication and structural steel work where extended reach is required. The two-flute spiral configuration promotes efficient chip evacuation in these deep-hole scenarios.

Key Features

• Wire size 30 (0.1285 inches decimal equivalent) straight cylindrical shank for standard chuck compatibility
• 135-degree split point is self-centering and reduces drill walking without spot drilling
• 12-inch overall length provides deep-reach access in confined or layered assemblies
• High-speed steel construction with bright uncoated finish for general-purpose metal drilling
• Two-flute right-hand spiral with web-thinned tapered web for improved chip flow and reduced thrust
• Meets NAS 907 Type B standards for aircraft drilling applications

Compatibility

Designed as a general-purpose aircraft extension drill bit in Series 3957-12, suitable for use with standard straight-shank drill chucks in corded drills, pneumatic drills, and drill presses used in aerospace maintenance and metalworking applications.

Installation Notes

Installation is performed by qualified machinists, aircraft maintenance technicians, or sheet metal tradespeople using a drill press or pneumatic right-angle drill with a compatible straight-shank chuck. Secure the workpiece firmly before drilling and confirm chuck grip on the full shank diameter to prevent slippage during operation. Use appropriate cutting fluid for steel substrates to preserve bit life. Diameter tolerance is +0.0000 to -0.0007 inches, so verify fit requirements before use in close-tolerance hole applications.