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hole gauge plate, 37.4 x 16.7 x 3 mm, three round holes

hole gauge plate, 37.4 x 16.7 x 3 mm, three round holes: 4.34 mm (.171 in, VCC CLIPLITE 3 mm LED mount), 6.35 mm (.250 in, VCC 5 mm mount; Dialight 559 prints .249-.252) and 6.73 mm (.265 in, Dialight 515 recommended hole), smallest first, 5 mm between hole edges and 5 mm of plate round the largest hole; plate thickness and spacing are Xem choices

Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

maker / part	VCC CLIPLITE
type	3 mm LED mount (SML 190 and others)
panel hole	.171 +/-.002 in = 4.34 mm, on 1/4 in centers
panel thickness / other	SML 190 1/32 to 1/16 in; SMB 200 and CLF 280 1/16 to 1/8 in; CLB 300 and CLR 301 1/32 to 1/4 in; spacer SPC 125 for panels under 3/16 in (the sheet does not map each model to 3 mm or 5 mm)
source	VCC CLIPLITE sheet

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From the full sheet

LED panel holders and clips for 3 mm and 5 mm LEDs: mounting hole and panel thickness (VCC, Dialight, Bivar) + hole gauge: every size, notes, mating features and sources. What hole does a 3 mm or 5 mm LED clip or holder need, and how thick can the panel be?