What is the outside diameter of the threads for this connector? I am looking for a fitting to install in a 7/8” hole.

Nope! They will not work! they are quite literally 1/2 inch. the 7/8 hole needs a 7/8 fitting. 7/8 is an odd measurement but my outlet(Hubbell 250v) claims "1/2 " knock out" but it, in fact is not. in fact I had to return these! get a box of grommets of varying sizes and you will come out with at least some of them correct!

how many 12/2 cables can go through each of these clamps?

I used these for a 12/3 which they worked well for. It would be possible to get two 12/2s through the opening, but tightening it down with the screws would be difficult as the screws are barely long enough for the extreme opening.

ASIN	B00NLOKBAQ
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#67,111 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #74 in Electrical Conduit Fittings
Brand	RACO
Color	Gray
Connector Type	Squeeze
Contact Material	Zinc
Customer Reviews	4.7 4.7 out of 5 stars (1,229)
Date First Available	September 15, 2014
Global Trade Identification Number	00050169914915
Included Components	NMSC Cable Connector
Insulation Material	Nylon
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	2.4 ounces
Item model number	2711B5
Manufacturer	Hubbell
Material	Copper
Maximum Voltage	120 Volts (AC)
Measurement System	Inch
Number of Items	5
Part Number	CECOMINOD020921
Product Dimensions	12.2"L x 10.8"W x 5.95"H
Size	5-Pack
Specification Met	UL
Temperature Rating	221 degree fahrenheit
Terminal	Squeeze
UPC	050169914915
Unit Count	5.0 Count

Hubbell-Raco 2711B5 Connector, Squeeze, NMSC Cable, 1/2-Inch, Zinc, 5-Pack

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