Quick Answer
A chamfer and a bevel are both flat, angled edges — chamfer usually implies a smaller edge break, bevel a larger structural angle for welding. A fillet and a radius are both curved transitions, not flat cuts, and are used where a rounded edge is preferred over an angled one.
Chamfer. Bevel. Fillet. Radius. Four words, four different edges — and on a shop drawing, mixing them up is exactly how the wrong machine ends up quoted for the job. Here's what each term actually means, starting with the pair that gets confused most: chamfer vs bevel.
Quick Reference: Flat Edges vs Curved Edges
Flat, Angled Cuts
- Chamfer — a flat angled surface, often a smaller edge break for safety or cosmetics
- Bevel — a flat angled surface, typically a larger structural angle cut for weld penetration
Curved, Rounded Transitions
- Fillet — a rounded, curved transition at a corner, used to reduce stress concentration
- Radius — a curved edge defined by a specific radius dimension, common in machining callouts
What Is a Chamfer?
A chamfer is a flat, angled surface that replaces a sharp edge or corner, cut at a defined angle rather than left as a curve. In plate fabrication, chamfers are most often cut for weld preparation, though they're also used for assembly clearance or a defined, safer edge.
Chamfer vs Bevel
In everyday shop usage, “chamfer” and “bevel” are frequently used interchangeably, especially for weld-prep edges. Where a distinction is drawn, “chamfer” sometimes refers to a smaller edge break, while “bevel” refers to a larger, structural angled edge specifically cut for weld penetration. There's no single industry-wide rule, so it's worth confirming what a drawing or spec means by either term in context. PCL's MDC-Series universal wheel head cuts both, commonly in the 30°–45° range used for structural weld prep.
Chamfer vs Fillet
A fillet is a rounded, curved transition at a corner or edge, as opposed to a chamfer's flat angled surface. Fillets are often used to reduce stress concentration at internal corners or to make an edge safer to handle, while chamfers are more commonly specified where a flat angled face is functionally required, such as weld preparation.
Chamfer vs Radius
“Radius” describes a curved edge defined by a specific radius dimension, similar in purpose to a fillet but the term used more often in machining and sheet metal design. Like the fillet comparison, the key difference from a chamfer is curved versus flat.
Frequently Asked Questions
They're often used interchangeably in plate fabrication, particularly for weld-prep edges. Some shops distinguish a chamfer as a smaller edge break and a bevel as a larger structural angle, but this isn't a universal standard.
A chamfer is a flat, angled surface; a fillet is a rounded, curved transition. Both modify a sharp edge or corner, but the resulting geometry is different.
Radius and fillet both describe curved edges, chosen over a chamfer when a rounded transition is preferred — often to reduce stress concentration or for a smoother handling edge.
Not a single universal standard — usage varies by shop and industry. That's why confirming what a specific drawing or welding procedure means by chamfer, bevel, fillet, or radius matters more than assuming a default definition.
