US Decora / GFCI rocker wall plate: outline, opening, screw holes (template) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/wall-plate-decora-us/  (sheet CC BY 4.0)
Basis: Arrow Hart / Hubbell Wallplate Dimensional Information (J-2, J-3); screw spacing per Kyle Switch Plates
Catalog version: 2026-10-20

Overall (mm): length 69.8, width 114.3, height 2.0
- Decora (rocker, GFCI) wall plate, US: outline, opening and screw holes for standard (4.50 in high), midway (mid-size, 4.87 in) and jumbo (oversize, 5.25 in) plates, 1 to 3 gang.
- The 18 files are templates, not the real plate profile: 2 mm thick, with true-size outline, openings and screw holes. Plate thickness, edge radii and bevel are not published, so none is modelled.
- Screw hole size is the 3/16 in bottom of the countersink quoted by a plate retailer; the real holes are countersunk for #6-32 oval-head screws.
- Heights are printed in inches (mid-size 4.87 in, which other lists round to 4.88 in); widths are printed in mm. Gang positions are 46.0 mm apart from the plate centre.
- Decora and GFCI rocker plates share one opening; Decora is a Leviton trade name, used here only to say which opening fits.

parameter  value
standard outline (height x width, 1 / 2 / 3 gang)  114.3 x 69.8 / 115.9 / 161.9 mm
midway outline (height x width, 1 / 2 / 3 gang)  123.7 x 79.4 / 125.4 / 171.4 mm
jumbo outline (height x width, 1 / 2 / 3 gang)  133.3 x 88.9 / 134.9 / 182.2 mm
first opening centre from the side edge (standard / midway / jumbo)  34.9 / 39.7 / 44.4 mm
gang to gang  46.0 mm (1.81 in)
decora opening (width x height)  33.3 x 67.1 mm (1.31 x 2.64 in)
plate screw holes  96.7 mm apart vertically at each opening centre (3.812 in); 4.76 mm (3/16 in) through
device mounting-strap hole spacing, box ears  3-9/32 in (83.3 mm)
plate thickness, edge radius, bevel  not published: files are a 2 mm template

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Arrow Hart / Hubbell Wiring (via Elliott Electric): Wallplate Dimensional Information, catalog pages J-2 and J-3 — web — Publisher's page; dimensions are facts — https://www2.elliottelectric.com/Media/68-EWD-1045-1-Other
- Kyle Switch Plates: Screw hole spacing on electrical wall plate covers — web — Publisher's page; dimensions are facts — https://kyleswitchplates.com/screw-hole-spacing-on-electrical-wall-plate-covers
- Kyle Switch Plates: Switch plate screw size, spacing and length options — web — Publisher's page; dimensions are facts — https://www.kyleswitchplates.com/switch-plate-screw-size-spacing-length-options/
- Hubbell Wiring: Jumbo wallplate catalog page (5.25 x 3.50 in, 2-gang 5.31 in) — web — Publisher's page; dimensions are facts — https://hubbellcdn.com/catalogpage/BRY_Q-14_CatalogPage.pdf

Free files (CC BY 4.0, Xem Studio; STEP + STL, 9 parts): https://xemstudio.com/files/hardware/wall-plate-decora-us/index.json
API: https://xemstudio.com/api/geometry?object=wall-plate-decora-us