Collection: Silicone Caps
Silicone masking caps for projecting studs, bolts, shafts and rectangular electrical tabs. Choose from round, flanged and rectangular designs. Maximum temperature: 250°C (482°F). Compare the protected area, external geometry and access for fitting and removal before choosing a cap.
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Silicone Caps with Flanges
Mask studs and bolts together with the surrounding spot face. Choose this flanged cap when the adjacent flat surface also needs to remain free of coating.
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Silicone Caps
Straight silicone caps mask projecting studs, bolts and round shafts. Match the cap's inside diameter and usable depth to the feature and the length that must remain uncoated.
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Rectangular Silicone Caps
Mask rectangular electrical tabs during coating, rather than round studs or holes. The chamfered edge helps coating reach the tab base while the cap covers the contact area.
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Silicone Caps/Plugs with Flanges
Use the hollow profile as a cap over a stud or as a plug in a threaded or non-threaded hole. In plug mode, the flange adds coverage at the hole entrance to protect the first thread or countersink.
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Selecting the right silicone cap
| Product | Protected area | Installation / removal | Dimensions to check |
|---|---|---|---|
| Silicone Caps with Flanges | External studs and bolts, plus the surrounding spot face covered by the flange. | Access from the free end of the stud or bolt; allow space to push the cap on and pull it off. | Stud or bolt diameter and projecting length; matching cap internal diameter and usable depth; flange coverage diameter and clearance around the base. |
| Silicone Caps | External surfaces of projecting studs, bolts and round shafts. | Push on and pull off from the exposed end; leave room to grip the cap for removal. | Feature outside diameter, cap inside diameter and usable internal depth relative to the length to mask; clearance around the cap. |
| Rectangular Silicone Caps | Covered external contact surfaces of rectangular electrical tabs. | Accessible free tab end for fitting and pulling off; leave room to grip the cap. | Tab width and thickness; required masking length against the cap’s internal depth. |
| Silicone Caps/Plugs with Flanges | Stud exterior in cap mode; covered bore section and first thread or countersink at the entrance in plug mode. | Access from the stud end or hole entrance; allow room to fit the body and grip it for removal from the same side. | Stud diameter versus inner diameter D1 (cap); bore diameter versus body outer diameter D2 (plug); flange diameter D3, flange position L1 and drawing length L2 versus the required coverage and available depth. |
Check the cap dimensions
- Measure the external geometry, the required coverage length and any shoulder or base face that must remain uncoated.
- Compare these with the cap’s internal dimensions and the selected product’s drawing and size table.
- Allow clearance for fitting the cap and gripping it for removal, including space around any flange.
Related guides
Match the cap to the finishing process
Geometry alone does not establish process suitability.
- For powder coating and e-coating, check part temperature and exposure time across the intended process.
- For anodizing and electroplating, assess the actual bath chemistry, concentration, temperature and immersion time.
Validate the masking result with representative parts before production.
Reuse depends on the process and condition of the cap. Inspect the cap’s fit surfaces and remove build-up before reuse; replace caps that are damaged or no longer fit as intended.
Need custom silicone masking caps?
A custom design is worth considering for nonstandard profiles, when several features must be masked together, or when access or coverage limits make a standard cap unsuitable. Share a drawing or sample, mark the surfaces that must remain uncoated and describe the finishing sequence.
- For internal holes and threads, see silicone plugs.
- For flat masking areas, compare masking tapes and custom die-cut masking.