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Materials & Applications
Compatibility
Materials & Applications
Recommended use cases for this product across common industrial materials and jobsite applications.
Aluminum alloys, Mild steel, Low to medium steel alloys
Aircraft assembly and structural drilling
Maintenance and service access holes
Deep or obstructed hole drilling
Structural fabrication where extra reach is required
Product details
Technical Description
Essential product information, specifications, and recommended use before ordering.
Champion CS12X-5/16 12" HSS Aircraft Extension Drill Bit — 135° Split Point
The Champion CS12X-5/16 is a 12-inch HSS aircraft extension drill bit made for long-reach drilling where a standard-length drill cannot reach the hole. This individual drill is the exact 5/16" fractional size and is a dependable 5/16" aircraft extension drill bit for aircraft assembly, structural fabrication, maintenance and obstructed-hole applications.
The CS12X features a 135° self-centering split point to reduce walking and improve hole-start accuracy. Its black oxide treated high-speed steel construction helps improve heat resistance and tool life, while the spring-tempered shank helps resist permanent bending when drilling holes that are not perfectly aligned.
Technical Specifications
- Exact size: 5/16" fractional size
- Decimal equivalent: 0.3125
- Manufacturer part number: CS12X-5/16
- Drill type: Aircraft extension drill
- Material: Black oxide treated high-speed steel (HSS)
- Point: 135° self-centering split point
- Flute length: 3-3/16"
- Overall length: 12"
- Shank: Spring-tempered extension shank
Applications
Use this Champion CS12X 5/16" fractional size extension drill for aircraft assembly fixtures, aluminum, low-to-medium steel alloys, deep holes, service-access holes, maintenance, structural drilling and fabrication where extra reach is required. The flute length is the same as a standard jobber drill for controlled chip evacuation.
Most Interesting Product Feature
Product highlight
Most Interesting Product Feature
- Long-Reach 135° Self-Centering Split Point Design. This feature drastically reduces walking at the drill start while providing deep reach with minimal deflection — a major advantage in aircraft and structural applications where precision matters.
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