Toggle switch bushings and panel holes: 1/4-40, 15/32-32, M6 x 0.75, M12 x 1 (NKK, C&K 7000, Carling) + hole gauge — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/toggle-switch-bushings-panel-holes/ (sheet CC BY 4.0) Basis: NKK series P and M catalog pages, the C&K 7000 series datasheet and a Carling toggle listing, as read; one hole gauge plate as a file Catalog version: 2026-10-20 Overall (mm): length 55.5, width 24.7, height 3.0 - Miniature toggles use a 1/4-40 bushing (or M6 x 0.75 on the metric NKK versions), larger power toggles use 15/32-32 (Carling, C&K T / T1 actuators) or M12 x 1 (NKK 12 mm). The thread is the nominal major diameter: 6.35 mm for 1/4-40, about 11.9 mm for 15/32, 12 mm for M12 (the 15/32 figure is the inch size converted, not a printed number). - Panel holes that are printed: NKK series P prints (6.35) / .250 in for the 6 mm bushing and (12.5) / .492 in for the 12 mm bushing; Carling's listing prints a circular 12.70 mm cutout for 15/32-32. The C&K 7000 datasheet read prints no hole number. NKK's catalog also draws (12.5) / .492 in for the large bushing, which agrees with series P. The 12.5 and 12.70 mm figures are different makers' holes for different bushings (M12 x 1 and 15/32-32), so they sit side by side on the gauge. - Keyway and flat: NKK prints keyway and D-flat codes by bushing (listed above) and a keyway notch of (1.1) x (2.0) mm drawn with the 1/4-40 thread; this is the notch on the bushing, whose position in the panel is not printed as a labeled number, so no notch is drawn. C&K lists keyway bushings (D, D9, Y, Y9, H3, H4, Y1, Y3) and flat bushings (D8, H, Y4). Use the matching keyed washer; a keyway needs the hole cut with a notch or a tab washer. - Panel thickness: NKK series P prints maximum thicknesses (.134 in / 3.4 mm, .102 in / 2.6 mm, .256 in / 6.5 mm, .217 in / 5.5 mm with keyway or locking ring) but the text read does not assign them to the 6 mm and 12 mm bushings, so they are not tabulated. C&K and Carling printed none. - File: toggle-bushing-hole-gauge is a plate with the three published round holes at true size. Plate thickness 3 mm, spacing and corner radius are Xem's choices. Rockers: rocker-switch-panel-cutouts; wall-plate toggles: wall-plate-toggle-us; maker CAD is linked, not copied. maker / series bushing / actuator thread panel hole (as printed) keyway / flat source NKK series P 6 mm bushing (.512 in white cap / .450 in flatted toggle) thread M6 P0.75 panel hole (6.35) = .250 in keyway (flatted toggle E) NKK series P catalog pages NKK series P 12 mm bushing (.689 in large bat / .748 in white capped column) thread M12 P1 panel hole (12.5) = .492 in keyway NKK series P catalog pages NKK series M S1, A1, D1, L1 small bushings 1/4-40; S1 bushing length .350 in (8.9 mm), A1 .280 in (7.1 mm) not labeled for the small bushings on these pages (a drawn .315 in / 8.0 mm is unlabeled and not used) keyway on S1, S2, A1, A2, S4, B1, L1, L2, L4; D-flat on D1, D3, D4, D8, L3, L8, B3; keyway notch (1.1) x (2.0) mm = .043 x .079 in drawn with the 1/4-40 thread NKK series M catalog pages NKK series M S4, D4, D8, L4, L8 6 mm bushings M6 P0.75 see series P see keyway / D-flat list above NKK series M catalog pages NKK series M B1, B3 large bushings 12 mm (.472 in) thread, M12 P1 (12.5) dia .492 in in the panel cutout drawing B1 keyway; B3 D-flat NKK series M catalog pages C&K 7000 T and T1 actuators 15/32-32 UNS-2A not printed bushing codes D, Y, H3, H4, Y1, Y3, Y9, D9 are keyway; D8, H, Y4 are flat C&K 7000 datasheet C&K 7000 all other actuators 1/4-40 UNS-2A not printed same bushing codes C&K 7000 datasheet C&K 7000 bushing heights D, D8, D9 .280 in; Y, Y9 .350 in; H .296 in; H3 .315 in; Y1, Y4 .378 in; H4 8 mm (metric, high torque, keyway); Y3 8.9 mm (metric, keyway) not printed add .070 in (1.78 mm) to actuator lengths for D, D8, D9; hardware: two mounting nuts, one locking ring, one lockwasher with threaded bushings C&K 7000 datasheet Carling toggle 110-73 standard toggle 15/32-32 circular 12.70 mm not stated Carling 110-73 listing Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - NKK Switches: Series P toggle switches (P2011 to P2023): bushing M6 P0.75 and M12 P1, panel hole (6.35) and (12.5), keyway, hardware part numbers — web — Maker catalog pages (archive copy); numbers only — https://deramp.com/downloads/mfe_archive/050-Component%20Specifications/Switches/NKK%20PToggles.pdf - NKK Switches: Series M miniature toggle catalog pages A52-A63 (M2012 / M2021 family): bushings S1, A1, D1, L1 (1/4-40), S4 / D4 / D8 / L4 / L8 (M6 x 0.75), B1 / B3 (M12 x 1), keyway and D-flat — web — Maker catalog pages (distributor copy); numbers only — https://www.nyang-tech.com/datasheet/41330281449/NKK-Switches/M2021LL3G01.pdf - C&K (Littelfuse): 7000 series miniature toggle datasheet: bushing codes (D, D8, D9, Y, Y1, Y3, Y4, H, H3, H4, CW), 1/4-40 UNS-2A and 15/32-32 UNS-2A threads, keyway and flat — web — Maker datasheet (DigiKey HTML copy); numbers only — https://www.digikey.de/en/htmldatasheets/production/1205415/0/0/2/7103syzqe - Carling Technologies: Toggle switch 110-73 (GlobalSpec datasheet listing): panel cutout circular 12.70 mm, bushing thread 15/32-32 — web — Maker listing; numbers only — https://datasheets.globalspec.com/ds/carling-technologies/110-73/13f5092e-0ed2-4f80-88c9-bef9a2ed2187 - NKK Switches: NKK Switches product pages (M-series and S-series toggles) with 3D CAD downloads per part — web — Maker site; CAD per part from the maker — https://www.nkkswitches.com/ - C&K (Littelfuse): C&K 7000 series toggle product page (3D models per part) — web — Maker page; CAD per part from the maker — https://www.ckswitches.com/products/switches/product-details/Toggle/7000?page=6 Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/toggle-switch-bushings-panel-holes/index.json API: https://xemstudio.com/api/geometry?object=toggle-switch-bushings-panel-holes