Copper Shim Stock
Copper Shim Stock is a soft, high-conductivity shim material ideal for heat transfer, gasketing and electrical applications. Supplied in 6" x 50" and 6" x 100" rolls from 0.025mm (0.001") to 3.00mm (0.118") thick, its thermal and electrical conductivity makes it a practical choice for transformer and bus-bar shims, heat-sink mounting, pipe joint gaskets, and precision spacing where effective transfer of heat or current matters alongside accurate clearance control.
Copper Shim Stock Specifications
| Copper Shim Stock | ||
|---|---|---|
| Parameter | Details | Typical Use |
| Material | Soft Electrolytic Copper | Heat transfer, gasketing and electrical shims |
| Form | Rolls or sheets | Cut-to-size shims and joint gaskets |
| Available lengths | 6" x 50" and 6" x 100" | Roll supply for cut-to-size shims |
| Thickness range | 0.025mm (0.001") to 3.00mm (0.118") | Micro to larger clearance adjustment |
| Conductivity | High thermal and electrical conductivity | Bus-bars, transformers, heat sinks and pipe joints |
| Supply note | Available by roll, sheet or cut length as per stock | Project and workshop procurement |
Buying Copper Shim Stock for Conductivity and Sealing
Copper Shim Stock stands apart from other shim materials because of its outstanding thermal and electrical conductivity. In electrical applications such as transformer cores, bus-bar joints and heat-sink mounts, copper shims maintain effective current and heat paths while providing the precise spacing the assembly requires.
Its soft temper also makes copper an excellent gasketing material for pipe flanges and heat exchangers, conforming to joint surfaces to improve sealing and heat transfer. Supplied in 6" x 50" and 6" x 100" rolls from 0.025mm (0.001") to 3.00mm (0.118") thick, copper shim stock gives technicians accurate control for both clearance setting and conductive interface work.
Copper Shim Stock Properties and Performance
Copper offers the highest thermal and electrical conductivity of any commercially available metal, which is why it is the shim material of choice wherever heat or current must pass through a joint. Shim-grade copper is typically C110 (99.9% pure), supplied soft and highly ductile so it forms and cuts easily, with good resistance to atmospheric corrosion in mildly aggressive environments.
Copper shim stock is precision-rolled to the same tight tolerances as the rest of our range, so the thickness you order matches the clearance you measured. Its soft temper also makes it an excellent gasketing material, conforming to flange and heat-exchanger faces to improve sealing and heat transfer.
Where Copper Shim Stock Is Used
Copper shims are widely used for grounding, shielding and thermal interface layers in electrical and electronic assemblies — transformer cores, bus-bar joints, heat-sink mounts, battery contacts and power distribution components. In mechanical work they form effective joint gaskets for pipe flanges and heat exchangers, and their flexibility lets them adapt to thermal expansion and repeated assembly cycles.
Choosing the Right Copper Shim Thickness
Select the gauge to match both the spacing requirement and the conductive duty. Thin copper shims from 0.025mm to 0.10mm suit fine adjustment, precision spacing and light electrical contacts; 0.10mm to 0.50mm covers general gasketing, heat-sink mounts and bus-bar interfaces; and thicker stock from 0.50mm up to 3.00mm handles structural packing and heavier current paths. For conductive or thermal interfaces, prefer a single clean layer at the exact thickness over a stack, which introduces resistance between layers.
Cutting and Fitting Copper Shim Stock
Measure the required thickness with feeler gauges or a micrometer before cutting. Simple shapes can be sheared with tin snips or punched by hand, while more intricate profiles benefit from laser cutting, waterjet or CNC. Fit the shim flat, without wrinkles or warping, and avoid stacking more than about four layers — for conductive or thermal interfaces especially, a clean single layer at the exact thickness performs best.
If your application needs structural spacing rather than conductivity, compare copper with our SS304 Shim Stock, SS316 Shim Stock and Brass Shim Stock, or review Pre Cut Shim Sets. Buyers can also start from the Shim Stock pillar page.
The most important checks before ordering are the required thickness and width, whether the application needs thermal or electrical conductivity, and the joint or fit configuration the shim must conform to. Confirming these points early ensures you choose the right copper shim stock for an effective, long-lasting result.
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