Model # 20511

Internet #100133208

Store SKU #839647

Halex 3/8 in. Non-Metallic (NM) Twin-Screw Cable Clamp Connectors (5-Pack)
0051411205119

Halex

3/8 in. Non-Metallic (NM) Twin-Screw Cable Clamp Connectors (5-Pack)

  • Features a reversible locknut to preserve grounding
  • Twin screw
  • High-strength die-cast zinc alloy
$166 /bag
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Frequently Bought Together

Product Overview

  • Features a reversible locknut to preserve grounding
  • Twin screw
  • High-strength die-cast zinc alloy
Turn to the 3/8 in. Twin Screw Non-Metallic Cable Clamp Connectors (5-Pack) to join non-metallic sheathed cable and flexible cord to steel outlet boxes or other metal enclosures. A reversible locknut cuts through protective coatings on boxes and enclosures to preserve grounding. This connector meets UL and CSA requiremenets.
  • Connect non-metallic sheathed cable and flexible cord to steel outlet boxes or other metal enclosures
  • Body and locknut are die-cast of high-strength zinc alloy
  • Zinc-plated steel clamp and screws
  • Reversible locknut cuts through protective coatings on boxes and enclosures to assure ground continuity
  • Fits 1/2 in. knockout
  • For indoor use only
  • Screws compatible with Phillips, slotted and square screwdrivers
  • Resists corrosion
  • UL and CSA safety listings

Product Overview

  • Features a reversible locknut to preserve grounding
  • Twin screw
  • High-strength die-cast zinc alloy
Model #: 20511
Sku #: 839647
Internet #: 100133208

Turn to the 3/8 in. Twin Screw Non-Metallic Cable Clamp Connectors (5-Pack) to join non-metallic sheathed cable and flexible cord to steel outlet boxes or other metal enclosures. A reversible locknut cuts through protective coatings on boxes and enclosures to preserve grounding. This connector meets UL and CSA requiremenets.

  • Connect non-metallic sheathed cable and flexible cord to steel outlet boxes or other metal enclosures
  • Body and locknut are die-cast of high-strength zinc alloy
  • Zinc-plated steel clamp and screws
  • Reversible locknut cuts through protective coatings on boxes and enclosures to assure ground continuity
  • Fits 1/2 in. knockout
  • For indoor use only
  • Screws compatible with Phillips, slotted and square screwdrivers
  • Resists corrosion
  • UL and CSA safety listings

Info & Guides

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Price
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Name 3/8 in. Non-Metallic (NM) Twin-Screw Cable Clamp Connectors (5-Pack) 1 in. Non-Metallic (NM) Twin-Screw Clamp Connector 1-1/4 in. Non-Metallic (NM) Twin-Screw Clamp Connector 1-1/4 in. Non-Metallic (NM) 2-Piece Clamp Connector (2-Pack)
Brand Halex Halex
Ratings (9) (1) (0) (0)
Application type Non-metallic Non-metallic Non-metallic Non-metallic
Fitting type Connector Connector Connector Connector
Trade Size (in.) 3/8 1 1-1/4 1-1/4
Material Galvanized Steel Galvanized Steel Galvanized Steel Galvanized Steel
View Product View Product View Product View Product

Specifications

Dimensions

Product Depth (in.)
1.18
Product Height (in.)
0.180
Product Width (in.)
0.64
Trade Size (in.)
3/8

Details

Application type
Non-metallic
Compatible conduit type
RNC
Electrical Product Type
Standard Fitting
Fitting type
Connector
Material
Galvanized Steel
Package Quantity
5
Paintable/Stainable
No
Product Weight (lb.)
0.2333lb
Returnable
90-Day

Warranty / Certifications

Certifications and Listings
1-UL Listed,CSA Listed
Manufacturer Warranty
None

Specifications

Dimensions

Product Depth (in.)
1.18
Product Height (in.)
0.180
Product Width (in.)
0.64
Trade Size (in.)
3/8

Details

Application type
Non-metallic
Compatible conduit type
RNC
Electrical Product Type
Standard Fitting
Fitting type
Connector
Material
Galvanized Steel
Package Quantity
5
Paintable/Stainable
No
Product Weight (lb.)
0.2333lb
Returnable
90-Day

Warranty / Certifications

Certifications and Listings
1-UL Listed,CSA Listed
Manufacturer Warranty
None

Questions & Answers

Can this be used for 2 cables?

Asked by: Peter
Depending on the cable size, the 3/8" clamps can accommodate two cables, e.g., #12 and #14 AWG. *However,* NEC requires following manufacturer's listing and labeling information/instructions for proper use. This means that if the manufacturer lists a particular clamp as only fitting a single cable of various sizes, then putting two cables into that clamp violates NEC (see 110.3). Here's how Halex lists this particular clamp (short answer - it will fit two #14/2 cables by listing): "Application: Indoors Only. Fits NM Cable: #14/2, #12/2, #12/3, AWG or 2 #14/2 AWG or Flex Cord .300 to .560 inches diameter 3/8" (1/2ko). Type: Twin Screw. In a dry location, use to connect nonmetallic sheathed cable to a steel outlet box or other metal enclosure. Miscellaneous: 3/8" size fits 1/2" knockout."
Answered by: Jeff
Date published: 2017-09-20

Can I use this to clamp two 12/2NM cables or is only suitable for one?

Can I use this to clamp two 12/2NM cables or is only suitable for one?
Asked by: Cjh
This is only designed for a single cable.
Answered by: CommunityAnswer
Date published: 2017-04-19

Is this for half inch knock outs?

3/8 is cable size correct? The KO size is 1/2 inch? Can I pass two 14/3 romex cables through a single cable clamp?
Asked by: Leop
Yes, the 3/8" clamps fit 1/2" knockouts. The clamps will accommodate two 14/3 cables as well as two 12/3 cables. *However,* NEC requires following manufacturer's listing and labeling information/instructions for proper use. This means that if the manufacturer lists a particular clamp as only fitting a single cable of various sizes, then putting two cables into that clamp violates NEC (see 110.3). Here's how Halex lists this particular clamp (short answer - it will fit two #14/2 cables by listing): "Application: Indoors Only. Fits NM Cable: #14/2, #12/2, #12/3, AWG or 2 #14/2 AWG or Flex Cord .300 to .560 inches diameter 3/8" (1/2ko). Type: Twin Screw. In a dry location, use to connect nonmetallic sheathed cable to a steel outlet box or other metal enclosure. Miscellaneous: 3/8" size fits 1/2" knockout."
Answered by: Jeff
Date published: 2017-09-20

Can this clamp works for 6/3 Romex wire?

Asked by: Vic
No, this is for 14/2, 14/3, 12/2, and 12/3 only. For 6/3, I would recommend AT LEAST 3/4" connectors.
Answered by: Nick
Date published: 2016-07-04
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Customer Reviews

3/8 in. Non-Metallic (NM) Twin-Screw Cable Clamp Connectors (5-Pack) is rated 4.1 out of 5 by 9.
Rated 5 out of 5 by from Excellent, easier to retrofit later These are excellent clamps. I'm in the process of retrofitting a house that has old metal boxes and 2 piece clamp connectors. The advantage with these is that you can loosen the wire from within the box, while 2 piece clamps can only be removed from outside... That means I have to destroy the box, the wire, or open the wall to get the clamps out. If these clamps were in the box, I could have removed the ring, extracted the box and save both the wire and box. I strongly recommend these to anyone using metal boxes. I would note the they have contractor 100 packs in store sometimes, but I haven't seen them online. Big cost savings in bulk as you can imagine. Otherwise this 5-pack is a better deal than individual at least.
Date published: 2013-11-26
Rated 1 out of 5 by from why are USA made ones being replaced by ones made in India...is there such a price difference????? why are USA made ones being replaced by ones made in India...is there such a price difference?????
Date published: 2016-11-22
Rated 4 out of 5 by from Good product at a decent price.. Much cheaper than Lowes. Good product at a decent price.. Much cheaper than Lowes.
Date published: 2016-12-20
Rated 5 out of 5 by from Excellent Clamps! These work great, for new work and for retrofitting. Attach easily to junction boxes and screw on tight. they keep romex cable very tight and secure. I would recommend anyone needing to run romex into junction boxes.
Date published: 2014-03-25
Rated 4 out of 5 by from One minor gripe Can't find much to complain about with these guys, except that occasionally the screws are long enough that when tightened they collide with something else nearby. I suppose they have to be as long as they are in case you want to clamp two cables in same knockout. Perhaps they should be sold in two flavors - one with long screws and one with shorter screws.
Date published: 2016-04-26
Rated 3 out of 5 by from My Bad, Trade Size, Who Knew? Yesterday I submitted a negative review about this product. Then it came to me after waking from a good sleep. THE DARN LABLING INDICATED "TRADE SIZE". I had found an old, but unused light fixture with 1/2" knockouts. These were 'real world' measurements, with 1/2" measuring 1/2" true. I've been doing electrical wiring for 60+ years, but not as an 'electrician'. I've always been on the smart side of the electrical world, . . ELECTRONICS and Communications. I didn't know that electricians had stupid secrets for craft protection. Sorry about the negative review. Ray
Date published: 2014-11-09
Rated 5 out of 5 by from Great Deal Bought these for a Home Improvement Project in mny basement.
Date published: 2016-09-27
Rated 5 out of 5 by from Excellent item Excellent item. Used for my recessed lighting. Will use again in the future.
Date published: 2016-02-10
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