Definition
An edge of a part that has been cut or ground at an angle, typically 45 degrees, instead of being left as a sharp 90-degree corner. Chamfered edges are commonly applied to bolt heads, shaft ends, holes, and structural components to ease assembly, prevent damage to mating parts, and remove sharp corners that could chip or cause injury.
Plain English
An edge that has been beveled — cut at a slant — so it isn't a sharp square corner. Think of how the end of a bolt is slightly tapered so it slides into a nut easily.
Context Anchor
Seen in aircraft maintenance, sheet-metal work, machined parts, hardware, and structural repair instructions.
Derivation
From the Old French 'chanfraindre,' meaning to bevel or cut off an edge. The term has been used in metalworking and woodworking for centuries to describe an angled cut that softens a corner.
Why Pilots Care
During preflight or maintenance inspections, a missing or damaged chamfer on a bolt or fitting can indicate wear, improper installation, or a part that won't seat correctly. Pilots involved in owner-maintenance tasks should recognize what a proper chamfered edge looks like.
Intuition Check
Chamfered does not mean chipped, worn away, or accidentally damaged. It means the edge was intentionally shaped into a small angle.
Example Sentence 1
The mechanic noted that the chamfered edge on the bolt allowed it to start threading into the nut without cross-threading.
Example Sentence 2
During inspection, the technician checked that all mounting holes had properly chamfered edges to prevent stress cracks.