DFM, tolerances and quality
How do I read a metal stamping tolerance chart?
Answer
Metal Stamping Tolerances · DFM · Quotation Metal Stamping Tolerance Standards: How To Read A Drawing Before Quoting Published September 16, 2026 · Balford Technical Team Most quotation arguments are tolerance arguments in disguise. A drawing that applies a blanket ±0.05 mm to every dimension — including formed walls, radii and hole positions produced by different stations — cannot be quoted honestly, because the tolerance that governs the price is not stated. How to read a tolerance block on a drawing
Sources
- Metal Stamping Tolerances: Reading A Drawing Before QuotingHome › Blog › Metal Stamping Tolerances · DFM · Quotation Metal Stamping Tolerance Standards: How To Read A Drawing Before Quoting Published September 16, 2026 · Balford Technical Team Most quotation arguments are tolerance arguments in disguise. A drawing that applies a blanket ±0....
- Metal Stamping Tolerances: Reading A Drawing Before QuotingMetal Stamping Tolerance Standards: How To Read A Drawing Before Quoting Which tolerances a stamping tool can hold, which ones need machining, and how to read a drawing so the quote matches the part you actually need. Most quotation arguments are tolerance arguments in disguise. A drawing that appli...
- Sheet Metal Gauge Chart - Gauge to mm and inchTwo other traps come with the number. A gauge is nominal: the mill tolerance on cold-rolled sheet is not zero, so a "1.2 mm" coil can arrive a few hundredths either side of 1.2 mm. And gauge says nothing about the material condition or the direction of the strip, both of which affect how the part fo...
- Sheet Metal Gauge Chart - Gauge to mm and inchState the thickness tolerance or the standard you want it held to, for example EN 10131 normal or special tolerances. Say whether the thickness is measured on the finished part after coating, and where on the part it is measured. If the part is drawn, say where the wall thickness is checked - most d...
- Sheet Metal Stamping Tolerances & ±0.01 mm LimitsCan tighter tolerances be achieved with a secondary operation? Often yes. A pierced or drawn feature can be brought into tolerance afterwards by coining/calibration in the die, or by CNC turning, milling or grinding where the geometry allows. The trade-off is cost per part, and the review will show ...
- Sheet Metal Stamping Tolerances & ±0.01 mm LimitsCan I get a tolerance check on my own drawing? Yes. Upload it to the DFM pre-screen : it lists the tolerance callouts it read, flags the ones tighter than the process normally holds, and names the feature that drives them. Are deep drawing tolerances different from stamping tolerances? Yes. Cutting ...
What an engineer still needs from you
- material and material condition (grade, temper)
- material thickness, plus the key diameter, height and wall thickness
- tolerances, burr direction and the visual acceptance standard
- annual volume - it decides whether tooling is single-hit, progressive or transfer
- surface finish, and any secondary machining, annealing or plating
Need a DFM feasibility assessment for your project?
Send the engineering drawing (STEP or PDF) with the material grade, thickness and annual volume. Balford engineers then check it against the process window - draw ratio, wall thickness, tolerances, blank and tooling route - and come back with what is feasible and what is not. An answer on this page cannot replace that review.
Upload a drawing for DFM reviewHow the DFM review worksRelated questions
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- What is first article inspection and when is it required?
- Do you provide IMDS, RoHS and REACH declarations?
This page is an engineering answer, not a quotation and not a dimensional acceptance. It is generated from Balford's published material and held to the verified company fact sheet.