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| PartNumber | AT4021CB | AT4021BB | AT4021 |
| Description | Switch Bezels / Switch Caps CAP RED/WHITE | Switch Bezels / Switch Caps RECT CAP WHITE | |
| Manufacturer | NKK Switches | NKK Switches | - |
| Product Category | Switch Bezels / Switch Caps | Switch Bezels / Switch Caps | - |
| RoHS | Y | Y | - |
| Product | Caps | Caps | - |
| Type | Button | Button | - |
| For Use With | Pushbutton Switches, Miniature | Pushbutton Switches, Miniature | - |
| Designed for | KB Series | KB Series | - |
| Color | Red, White | White, White | - |
| Height | 10.8 mm | 10.8 mm | - |
| Length | 16.1 mm | 16.1 mm | - |
| Material | Polycarbonate (PC) | Polycarbonate (PC) | - |
| Series | KB AT | KB AT | - |
| Termination Style | Snap On | Snap On | - |
| Width | 11.6 mm | 11.6 mm | - |
| Brand | NKK Switches | NKK Switches | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Product Type | Switch Bezels / Switch Caps | Switch Bezels / Switch Caps | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Switch Accessories | Switch Accessories | - |
| Part # Aliases | AT-4021-R | AT-4021-W | - |