Design recommendations and general engineering considerations for custom sheet metal fabrication projects.
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Bend geometry should be reviewed based on material, thickness, grain direction, bend angle, forming method, and tooling. The following points are preliminary DFM considerations rather than guaranteed manufacturing limits.
The required inside bend radius depends on material grade and temper, thickness, grain direction, bend angle, forming method, and tooling. Using consistent bend radii across a part can help simplify setup and improve forming consistency.
Minimum flange length depends on material thickness, inside bend radius, bend angle, die opening, and tooling. Insufficient flange support may prevent stable forming or reduce dimensional consistency.
The width of a bend relief should provide adequate separation between the bent flange and adjacent material. The required width depends on material thickness, relief geometry, cutting process, and forming conditions.
The depth of a bend relief should extend beyond the bend deformation zone to help reduce tearing, bulging, or distortion near the end of a bend. The required depth depends on material thickness, inside bend radius, bend angle, relief geometry, and tooling.
* Important Note: Final bend and relief dimensions should be confirmed based on material, thickness, part geometry, forming sequence, and available tooling. Critical features should be reviewed before production.
Proper spacing between holes, slots, bends, and edges helps improve manufacturability and reduces the risk of deformation during fabrication.
Ø ≥ T
Using a hole diameter at least equal to the material thickness is a conservative starting point for standard laser-cut sheet metal features. Smaller holes may be feasible depending on the material, thickness, cutting process, and cut-quality requirements.
Preliminary reference for standard laser-cut holes.
Project-Specific DFM Review
A is the clear edge-to-edge distance between adjacent holes. Required spacing depends on material thickness, hole size, cut quality, and the strength required in the remaining web.
Increase spacing where the remaining material carries load.
Project-Specific DFM Review
B is measured from the bend reference shown to the hole centerline. Required clearance depends on the material, thickness, hole diameter, inside bend radius, bend angle, and tooling. Holes located within the bend deformation zone may distort during forming.
Confirm critical hole locations during drawing review.
Project-Specific DFM Review
C is the clear distance from the slot edge to the part edge. Required clearance depends on material thickness, slot width, loading conditions, and the strength required in the remaining web.
Increase clearance for load-bearing or deformation-sensitive features.
*General Note: These are preliminary DFM references, not guaranteed manufacturing limits. Actual requirements may vary with material, thickness, feature size, part geometry, cutting method, bending sequence, and tooling. Critical features should be confirmed during drawing review.
Proper hardware selection and placement can help improve fastening reliability, assembly fit, and manufacturing consistency.
Select the fastener type and length only after confirming the manufacturer's minimum sheet thickness, permitted sheet hardness, mounting-hole size, and installation requirements.
Allow sufficient clearance from sheet edges, bends, and adjacent features. Confirm the mounting-hole size, minimum sheet thickness, permitted sheet hardness, and installation requirements for the selected stud.
Confirm that the material thickness, countersink angle, and major diameter leave sufficient material to support the fastener and avoid excessive thinning or distortion.
Use the fastener manufacturer's specified minimum distance from the mounting-hole centerline to the sheet edge for the selected fastener type and size. Clearance from adjacent bends should be confirmed separately based on the bend region and installation requirements.
* Note: Self-clinching hardware may include PEM® and equivalent fastening systems depending on project requirements. Hole size, sheet thickness, sheet hardness, edge distance, bend clearance, and installation requirements must be confirmed for the selected hardware.
Standard tolerances for common sheet metal manufacturing processes. Values shown are typical reference tolerances and may vary depending on material, thickness, geometry, and equipment.
| Process / Feature | Typical Reference Tolerance | Notes |
|---|---|---|
| Laser Cutting | ±0.10–0.25 mm | Depends on material type, thickness, geometry, and cut-edge requirements. |
| Formed Sheet Metal Features | ±0.25–0.75 mm | Features across bends may be affected by bend angle, springback, and tolerance stack-up. |
| Bending Angle | ±1.0° | Tighter angular requirements should be reviewed based on material, thickness, bend length, and tooling. |
| Post-Machined Critical Features | Project-specific | Tighter tolerances may require secondary machining, controlled datum references, and drawing review. |
| Welding / Welded Assemblies | Project-specific, often ±1.0 mm or wider | Welding distortion, fixturing, heat input, and assembly stack-up may affect final dimensions. |
* General Note: These values are typical reference tolerances for sheet metal manufacturing and should not be treated as guaranteed limits. Actual tolerances depend on material, thickness, geometry, forming sequence, welding, finishing, and inspection requirements. Project-specific tolerances should be confirmed during drawing review.
Surface treatments may affect dimensions, appearance, corrosion resistance, and assembly interfaces. Required allowances should be reviewed before production.
Typical Thickness
60–120 μm
Coating buildup may affect tight-fitting features, threads, and mating surfaces. Required thickness depends on the coating system and project requirements.
Typical Reference Thickness
5–25 μm
Hard anodizing should be specified separately. Coating thickness and dimensional change depend on alloy and process requirements. Masking or dimensional allowance may be needed for threads and close-fitting features.
Typical Thickness
5–12 μm
Zinc plating can provide corrosion protection for suitable steel components. Required thickness depends on the specification, service environment, and dimensional requirements.
Stainless Steel Treatment
Passivation can improve corrosion resistance without depositing a conventional coating. Electropolishing smooths the surface through controlled material removal and may affect critical dimensions or edges.
Simple design practices can help improve manufacturability, reduce avoidable cost drivers, and simplify production planning.
Use consistent bend radii and avoid tight reverse bends where possible.
Provide adequate clearance for fasteners, tools and assembly operations.
Account for coating or plating thickness on mating and critical surfaces.
Minimize tapping, rework and special tooling where standard solutions work.
Our engineering team reviews tight-tolerance areas, evaluates suitable manufacturing methods, and identifies risk points related to deformation, fit, and rework before production.
Yes. We provide design-for-manufacturing (DFM) reviews to improve manufacturability, identify cost drivers, and review assembly considerations.
We work with common sheet metal materials such as aluminum, stainless steel, carbon steel, brass, and copper. Thickness range depends on the material and selected manufacturing process.
Recommended finishes depend on material, application, and desired aesthetics. Common options include anodizing, powder coating, plating, and passivation. We can recommend suitable finishes based on corrosion protection, electrical requirements, appearance, and assembly needs.
Our engineering team can review your drawings, evaluate manufacturability, and plan fabrication, hardware installation, surface finishing, inspection, and assembly requirements for your project.
Upload your drawing and provide the material, thickness, quantity, critical tolerances, surface finish, hardware, assembly, and inspection or documentation requirements.
