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.

does it fit a Romex 6/3?

This connector may be too small/tight to fit 6/3 WG Romex. If it was me, I would use a 3/4 “ ROMEX Connector…

Are these supposed to actually be 1/2 trade size as listed? I see a few people getting 3/8 in reviews.. is that fixed?

These connectors fit in a 1/2” knock out on a emt 1900 box, hope that’s helpful..

Raco 2711b5 Connector Squeeze Nmsc Cable 1 2 Inch Zinc

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Description

🔧 Connect with confidence — rugged, reliable, ready.

COMPACT 5 PACK VALUE - Stock up and stay ready with a convenient bundle that keeps your toolkit future-proof.
CERTIFIED SAFETY ASSURANCE - UL and CSA listings guarantee compliance and peace of mind on every project.
PRECISION SQUEEZE TERMINAL - Effortless, secure cable connection designed for quick installation and lasting hold.
VERSATILE NMSC COMPATIBILITY - Supports multiple wire gauges (#14 to #10) with or without ground for flexible electrical setups.
RUGGED ZINC DIE CAST DURABILITY - Engineered to withstand harsh environments and protect your wiring raceway with confidence.

The RACO 2711B5 is a 1/2-inch squeeze-type connector crafted from corrosion-resistant zinc die-cast metal, designed for secure connections of Nonmetallic Sheathed Cable (NMSC) in dry locations. UL and CSA listed, it supports multiple wire gauges and comes in a convenient 5-pack, making it a trusted choice for professional-grade electrical installations.

Specifications

Asin	B00NLOKBAQ
Best Sellers Rank	#164,835 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #224 in Electrical Conduit Fittings
Brand Name	RACO
Color	Gray
Connector Type	Squeeze
Contact Material	Zinc
Customer Reviews	4.7 4.7 out of 5 stars (1,253) 4.7 out of 5 stars
Global Trade Identification Number	00050169914915
Included Components	NMSC Cable Connector
Insulation Material Type	Nylon
Item Dimensions L X W X H	12.2"L x 10.8"W x 5.95"H
Item Weight	2.4 ounces
Manufacturer	Hubbell
Material Type	Copper
Maximum Voltage	120 volts_of_alternating_current
Model	2711B5
Number Of Items	5
Part Number	CECOMINOD020921
Specification Met	UL
Stud Size	1/2
Temperature Rating	221 degree fahrenheit
Terminal	Squeeze
Unit Count	5 Count
Upc	050169914915
Wire Diameter	1.63 millimeters

Reviews

User

Durable and as described

Good quality material and as described

5.04.2026

User

Good value

UL listed at a great value. What more can a consumer ask for? They work great and the threads are smooth.

27.12.2023

User

Good connectors great price

Great priced romex connectors

2.11.2025

User

Fast Shipping!

Okay

28.11.2024

User

works good

clamps wire securely

8.12.2024

User

They did their job

Pretty good

25.06.2025

User

Pricey, but worked well

Acceptable quality. Worked well.

10.01.2024

User

Quality

I have used these for years and always quality.

9.07.2024

User

Works as expected

15.12.2025

User

Wire holders

They were perfect for the octaganl junction boxes.

21.09.2025

User

worked great

they worked

22.02.2026

User

Perfect fit and à good value

These worked exactly as expected and is a good value. Clamps open and close easily and seem solid

11.06.2024

User

good price

small profile to fit in control panels

1.12.2023

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TrustScore 4.5 | 7,300+ reviews

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Very impressed with the quality and fast delivery. Will shop here again.

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

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Description

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Common Questions