# Rocker switch panel cutouts: KCD1-style 19.3 × 13, 22 × 30 mm, Carling Contura / APEM KG 36.8 × 21.1 + cutout gauge

> What panel cutout does a KCD1 rocker switch need, and what about 22 × 30 and Contura rockers?

- Category: Electronic components › Panel cutouts
- Kind: Standard part
- Basis: Multicomp, Multicomp Pro, Arcolectric, GEV, Carling and APEM datasheets, plus a McMaster-Carr category row; one gauge plate as a file. KCD3 and E-Switch R5 cutouts were not usable and are left out
- Page: https://xemstudio.com/objects/rocker-switch-panel-cutouts/ · JSON: https://xemstudio.com/api/geometry?object=rocker-switch-panel-cutouts · Plain text: https://xemstudio.com/objects/rocker-switch-panel-cutouts/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 118.1 | 38.0 | 2.0 |

**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- A snap-in rocker switch fits a rectangular hole with a spring-clip body behind the panel; the hole is slightly smaller than the bezel. Rows give the maker's cutout as width × height (mm) and the panel thickness range the clips take. The page panel-cutouts already has KCD1 (19 × 13) and KCD4 (30 × 22) as rounded numbers; this page gives the maker datasheet figures and the other families.
- KCD1-size: Multicomp's MC36328 sheet prints a bezel of 21 × 15 mm and a cutout of 19.3 × 13 mm at 1 mm panel growing to 19.5 × 13 mm at 3 mm; Arcolectric's 8500 series prints 19.3 × 12.9 mm; McMaster's miniature rocker row reads 3/4 × 1/2 in (19.05 × 12.7 mm) from a category summary. A blog (LCSC) calls 21.2 × 15.0 mm the standard KCD1 cutout; that is the size of the bezel on the Multicomp sheet, not of the hole, so it is not used. The gauge cuts 19.3 × 13.0.
- 22 × 30: Multicomp Pro's sheet prints 22 ± 0.1 × 30 (+0.2 / −0) mm for the standard version and 30.2 mm for the metal waterproof cap version; GEV's listing prints 30 × 22 mm. The gauge cuts 30.0 × 22.0 (the nominal).
- Large power rockers: Carling's Contura sheet prints one 'switch mounting hole' of 1.450 × .830 in (36.83 × 21.08 mm) for every actuator, with no label for width and height; APEM's KG sheet prints 36.80 × 21.08 mm with a 0/+0.3 tolerance (it also prints the 36.80 as '1.149 in', which is a typo for 1.449 in, so the inch figure is ignored). The gauge cuts 36.83 × 21.08 (Carling).
- Left out: KCD3 (LCSC titles say 30.5 × 13.5 and 13 × 30 mm and do not say whether that is the body or the hole), E-Switch R5 (the sheet read prints three cutout widths, 30.0–30.8 mm, by panel thickness band but its other cutout dimension was not captured), and the 13 × 19.2 mm size (no maker sheet reached). Panel thickness for Arcolectric 8500, GEV and McMaster was not printed in the pages read. Plate size and 2 mm thickness are Xem choices; 2 mm is within the thickness range in every row that prints one.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| cutout | 19.3 × 13 (to 19.5 × 13 at 3 mm panel) KCD1 style; 30 (+0.2/−0) × 22 ±0.1; 36.83 × 21.08 (Carling); 36.80 × 21.08 (0/+0.3, APEM) | panel thickness 1–3 / 0.7–3.5 / 0.76–6.35 / 0.8–4.6 | designed | rocker-cutout-gauge* |

## Sizes

| switch | bezel / body (mm) | cutout W × H (mm) | panel thickness (mm) | source |
|---|---|---|---|---|
| Multicomp MC36328 (miniature, KCD1-style) | bezel 21 × 15, depth 22.7 | 19.3 × 13 (1 mm panel) to 19.5 × 13 (3 mm panel) | 1–3 | Multicomp datasheet |
| Arcolectric (Bulgin) 8500 series | — | 19.3 × 12.9 | not read | Arcolectric 8500 catalogue |
| McMaster-Carr 'miniature rocker switches' | — | 3/4 in high × 1/2 in wide (19.05 × 12.7), as read from the category page | not given | McMaster-Carr category |
| Multicomp Pro 22 × 30 (DPST 20 A, standard) | — | 30 (+0.2/−0) × 22 ± 0.1 | 0.7–3.5 | Multicomp Pro datasheet |
| Multicomp Pro 22 × 30 (metal waterproof cap) | — | 30.2 × 22 (the sheet prints 30.2 for the cap version) | 0.7–2.5 | Multicomp Pro datasheet |
| GEV rocker 30 × 22 mm | — | 30 × 22 | not given | GEV listing |
| Carling V-Series Contura (all actuators) | — | 36.83 × 21.08 (1.450 × .830 in; the sheet does not say which is width) | 0.76–6.35 (no gasket) | Carling datasheet |
| APEM KG series (power rocker) | — | 36.80 × 21.08 (0/+0.3) | 0.8–4.6 (2–3.5 recommended) | APEM datasheet |

## Where the files are

- Multicomp (via Farnell): [MC36328 miniature rocker switch: bezel 21 x 15 mm, cut-out 19.3 x 13 mm min at 1 mm to 19.5 x 13 mm at 3 mm, panel 1 to 3 mm](https://www.farnell.com/datasheets/1662750.pdf) — web — Maker datasheet; numbers only
- Arcolectric (Bulgin) via DirectIndustry: [8500 series miniature rockers: panel cut-out 19.3 x 12.9 mm](https://pdf.directindustry.com/pdf/arcolectric/8500/9337-583668.html) — web — Maker catalogue; numbers only
- Multicomp Pro (via Farnell): [22 mm x 30 mm rocker, DPST 20 A: cut-out 22 ± 0.1 x 30 (+0.2/-0) mm, panel 0.7 to 3.5 mm (metal waterproof cap: 30.2 mm, 0.7 to 2.5 mm)](https://www.farnell.com/datasheets/3626657.pdf) — web — Maker datasheet; numbers only
- GEV: [Rocker switch 30 x 22 mm, 2CO 250 V, faston 6.3: mounting measurements 30 x 22 mm](https://www.gev-online.com/en/webshop/product/301004) — web — Maker page; numbers only
- Carling Technologies: [V-Series Contura datasheet: switch mounting hole 1.450 x .830 in (36.83 x 21.08 mm), panel .030 to .250 in without gasket](https://www.mouser.com/datasheet/2/65/V-Series-XIV_datasheet-357257.pdf) — web — Maker datasheet; numbers only
- APEM (via Chipsmall): [KG series power rocker (SW-KG-1801): panel cut-out 36.80 x 21.08 mm (0/+0.3), panel 0.8 to 4.6 mm, recommended 2 to 3.5 mm](https://datasheet.chipsmall.com/KG312A2XXA/657534.pdf) — web — Maker datasheet; numbers only
- LCSC: [KCD1 and KCD2 rocker switches guide: standard KCD1 panel cutout 21.2 x 15.0 mm (disagrees with the maker datasheets; not used)](https://www.lcsc.com/blog/kcd1-switches-rocker-switches-guide/) — web — Blog; one figure checked, not used
- McMaster-Carr: [Lighted rocker switches (rockers, toggles, lever switches) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/lighted-rocker-switches/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/rocker-switch-panel-cutouts/index.json

- rocker-cutout-gauge-19x13-30x22-37x21: [STEP](https://xemstudio.com/files/hardware/rocker-switch-panel-cutouts/rocker-cutout-gauge-19x13-30x22-37x21.step) · [STL](https://xemstudio.com/files/hardware/rocker-switch-panel-cutouts/rocker-cutout-gauge-19x13-30x22-37x21.stl) — cutout gauge plate, 118.1 × 38.0 × 2 mm, three rectangular holes: 19.3 × 13.0 mm (Multicomp MC36328 miniature rocker, KCD1-size), 30.0 × 22.0 mm (Multicomp Pro 22 × 30 rocker) and 36.83 × 21.08 mm (Carling Contura mounting hole, 1.450 × .830 in); plate size and 2 mm thickness are Xem choices (2 mm is inside every maker's published thickness range)

## Questions

**What size hole does a KCD1 rocker need?**

About 19.3 × 13 mm per Multicomp's MC36328 sheet (bezel 21 × 15), in a 1–3 mm panel.

**What is the cutout for a 22 × 30 rocker?**

22 ± 0.1 × 30 (+0.2/−0) mm per Multicomp Pro; 30.2 mm for the metal waterproof cap version.

**What is the Carling Contura mounting hole?**

1.450 × .830 in (36.83 × 21.08 mm); APEM's KG prints 36.80 × 21.08 mm.

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