×45° Chamfer
Chamfer · Indicadores dimensionales · ISO 1101 + ASME Y14.5
Example in plan
How to interpret it
On the drawing, “2×45° or C2 on edge” states a chamfer requirement.
What controls
A cut on an edge along an inclined plane, dimensioned by the length of the cut and the angle, or by a shorthand designation when the angle is 45 degrees. It serves very specific purposes: easing entry of a part into its bore, removing a sharp edge, preparing a weld joint or providing a thread runout. It is not a fillet: the transition is angular and its behavior with respect to stress concentration differs from that of a radius.
How to verify
A caliper or optical comparator for the length of the cut, and an angle gauge or comparator for the angle; for small lead-in chamfers, a chamfer gauge or the comparator itself is the practical option. In series production, functional verification with the mating part is faster and more meaningful than measuring. Undimensioned deburred edges are checked visually and by touch.
Workshop guideline values
- General
- Chamfers of 0.5 to 2 mm at 45 degrees on general machining and deburred edges.
- Accuracy
- Lead-in chamfers of 0.3 to 1 mm controlled in size and angle for guided assemblies.
- High precision
- Chamfers dimensioned with tight tolerance on seats, seals and functional edges.
Guidance only: the drawing's value always wins.
Common mistakes when interpreting it
- Confusing the leg length with the length of the inclined face on chamfers at angles other than 45 degrees.
- Replacing a chamfer with a fillet of the same size: the function and behavior are not equivalent.
- Ignoring the general note on chamfers and edges, which usually applies to the whole part without being drawn.
How to get it in the workshop / if it comes out of tolerance
Check whether the dimension gives the leg length or the length of the inclined face, because at angles other than 45 degrees they do not match. A wrongly sized lead-in chamfer prevents assembly even if the diameter is right. If the drawing carries a general note on chamfers or deburring, that note affects all undimensioned edges and can add an entire operation that is not drawn.
Chamfer uneven along an edge: lack of rigidity or tool wear; on a lathe, also check the parallelism of the carriage. Chamfer that does not let the part enter: check whether the leg length has been interpreted as the inclined face. And if the edge is left with a burr after chamfering, it is a problem of cutting direction or edge condition, not of chamfer size.
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