Short answer: A deburring or edge break specification should say which edges matter, which burr side is acceptable, what edge condition is required, how it will be inspected, and whether the purpose is safety, assembly fit, plating, cosmetics, or electrical contact. Vague notes such as “no burr” often create avoidable cost and disagreement.
Stamped parts almost always have an edge condition from blanking, piercing, trimming, or cutoff. Some parts only need safe handling. Others need controlled edges because the part touches insulation, slides in a slot, receives plating, seals against a surface, or is handled by an operator. A useful print separates critical edges from ordinary edges.
Use this page with the metal stamping burr control guide, punch and die clearance guide, defects troubleshooting guide、および cleanliness control guide.
Edge notes buyers can actually quote
| Print note | What it usually means | When to use it |
|---|---|---|
| No loose slivers | Remove torn metal that can detach or cut handling gloves. | General brackets, covers, and industrial hardware. |
| Break sharp edges | Remove sharp feel without requiring a controlled radius. | Operator-handled parts or simple assemblies. |
| Maximum burr height | Limit burr height with a defined measurement method. | Fit, sliding, insulation, or electrical contact risks. |
| Edge radius required | Specify a controlled radius or rounded edge condition. | Sealing surfaces, handled medical parts, or wear surfaces. |
| Critical edge zone | Only selected edges need tighter control. | Cost control when most edges are nonfunctional. |
Do not make every edge critical
Over-specifying all edges can add tumbling, brushing, manual work, inspection time, and handling risk. Some features may be too delicate for aggressive tumbling. Some plated or cosmetic parts may need protection after deburring. If only one edge touches a wire, gasket, housing, or user’s hand, mark that edge clearly and allow normal stamping edge condition elsewhere.
For thin electronics, battery tabs, spring contacts, and shields, edge direction can be as important as burr height. See the thin gauge stamping design guide, battery contact plate guide、および terminal contact design guide.
Choose the deburring method by risk
Tumbling can work well for many small steel or stainless parts, but it can bend tabs, mark cosmetic surfaces, or trap media. Brushing can control flatter edges but may miss internal windows. Manual deburring is flexible but depends heavily on operator consistency. Fine blanking, shaving, or tooling changes may be better when the edge itself is a functional surface.
If a part will be plated, passivated, cleaned, or powder coated, the deburring sequence matters. Sharp burrs can cause plating buildup or exposed edges. Media residue can create cleanliness issues. A brushed cosmetic surface may need protection before packaging. Connect the edge note to the finish route, not only the stamping operation.
Inspection method must match the note
An edge requirement is weak if no one knows how to inspect it. Visual inspection can find loose slivers and obvious sharp edges, but it cannot prove a small numeric burr limit. A finger wipe can catch handling risk but is subjective. Magnification, burr gauges, profile measurement, or functional assembly checks may be needed for critical features.
For production parts, add edge checks to the control plan and sampling method. For incoming inspection, define how the buyer will check the same requirement so the supplier and buyer do not use different rejection standards.
Common causes of edge disputes
- The drawing says “no burr” but does not define burr height or inspection method.
- The supplier quoted standard tumbling while the buyer expected a controlled radius.
- The burr side is acceptable for stamping but faces the wrong direction in assembly.
- Deburring changes cosmetic appearance, flatness, or part dimensions.
- Plating or cleaning reveals an edge issue that was not visible before finishing.
- The buyer rejects all edges when only one edge affects function.
Deburring RFQ checklist
Send the drawing, material, thickness, temper, burr side, critical edge zones, finish route, handling risk, assembly condition, inspection method, volume, and any rejection photos. If the part is already failing, include the failed edge location, magnification if available, and how the edge was inspected.
For edge review, send drawings and photos through the お問い合わせページ. If you need a quote that includes tumbling, brushing, passivation, plating, or packaging, use the RFQ form and include the required edge note.
FAQ: deburring and edge break specs
Is “no burr” a good drawing note?
Usually no. It is better to define burr side, maximum burr height, critical edges, edge break, or the inspection method used to accept the edge.
Does deburring change part dimensions?
It can. Aggressive tumbling, brushing, or manual work may affect small tabs, edge width, cosmetic surfaces, or flatness on thin parts.
Should edge break be inspected visually?
Visual inspection may be enough for simple no-sharp-edge requirements, but numeric burr limits or radii need a defined measurement method.
When should only selected edges be deburred?
Selected edge control is useful when only certain edges affect safety, fit, insulation, sealing, sliding, plating, or appearance.