Crouse-Hinds 20 Malleable Iron...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$172.58
Crouse-Hinds 20 Malleable Iron Threaded Conduit Locknut, 4-Inch

Crouse-Hinds 20 Malleable Iron Threaded Conduit Locknut, 4-Inch

(No reviews yet) Write a Review

Model: CRS20

In Stock (leaves warehouse same day if ordered before 3pm ET)

$172.58
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Crouse-Hinds 20 Malleable Iron Threaded Conduit Locknut, 4-Inch

The Crouse-Hinds 20 is a 4-Inch threaded conduit locknut built from durable malleable iron, designed to secure rigid or IMC conduit connections to enclosures, boxes, and cabinets in commercial and industrial electrical systems. Malleable iron construction provides the strength needed to hold a firm, vibration-resistant grip on threaded conduit hubs while standing up to the demands of harsh installation environments. As a foundational conduit fitting accessory, the Crouse-Hinds 20 locknut is engineered to pair with matching threaded conduit and bushings to complete a secure, code-compliant raceway termination at panelboards, cabinets, and equipment enclosures.

Key Features

  • Trade Size: 4-Inch sizing for use with matching 4-Inch threaded rigid or IMC conduit and enclosure knockouts.
  • Durable Construction: Malleable iron body resists deformation and wear, providing long-term mechanical strength at the conduit termination point even under repeated installation stress.
  • Threaded Design: Internal threads engage directly onto threaded conduit or conduit hubs, allowing the locknut to be torqued down for a tight, secure mechanical connection.
  • Locknut Function: Designed to bear against the inside or outside surface of an enclosure wall, locking conduit in place and preventing loosening from vibration or movement over time.
  • Compatible Fitting: Works as part of a complete conduit termination assembly alongside bushings and couplings sized to the same 4-Inch trade size.
  • Simple Field Installation: Threaded engagement allows electricians to hand-start and wrench-tighten the locknut quickly, streamlining conduit termination on the job site.

Technical Specifications

  • Product Type: Conduit Locknut
  • Trade Size: 4-Inch
  • Material: Malleable Iron
  • Connection Type: Threaded

Typical Applications

  • Commercial and Industrial Electrical Installations
  • Conduit and Raceway Termination at Enclosures and Boxes
  • Panelboard and Cabinet Wiring Connections
  • New Construction and Electrical Renovation Projects
  • Rigid and IMC Conduit Systems Requiring Secure Threaded Termination

Why Crouse-Hinds?

Crouse-Hinds builds conduit fittings from rugged malleable iron to deliver dependable, long-lasting connections that electrical professionals can trust on the job site. The threaded locknut design ensures conduit stays firmly secured to enclosures, supporting reliable, code-compliant raceway systems in demanding commercial and industrial settings where durability and consistent performance matter most.

Manufacturer Resources

Product Specs

list_batch:
CRS-20260917
Product Type:
Locknut
Department:
Electrical
Product Subgroup:
Conduit Fittings
Product Length:
6.84 in
Product Material:
Malleable Iron
Product Size:
4"
Product Weight:
0.22 lb
Product Height:
1.26 in
Product Width:
1.57 in
Product Group:
Conduit & Raceway

Crouse-Hinds CRS20 – Frequently Asked Questions

1) Will the Crouse-Hinds 20 locknut fit 4-inch rigid or IMC conduit?
Yes. The Crouse-Hinds 20 is a 4-inch trade size threaded locknut, so it threads onto 4-inch rigid metal conduit or 4-inch IMC and seats against the enclosure wall at a 4-inch knockout. It will not work on any other trade size; thread engagement is size-specific, so a 3-inch or 3-1/2-inch run needs the matching locknut for that size.
2) Do I need a bushing with the 4-inch locknut, or is the locknut all I need to terminate the conduit?
The locknut is only the mechanical lock. On a 4-inch rigid or IMC termination you also want a bushing (and couplings where the run is joined), all in the same 4-inch trade size, to complete the assembly at the box or cabinet. The Crouse-Hinds 20 is sold as the locknut alone, so order the bushing separately.
3) What is the Crouse-Hinds 20 made of, and does it hold up in a high-vibration industrial space?
Malleable iron. That is the point of this fitting: the iron body resists deformation and keeps a firm grip on the threads so the conduit does not back off from vibration or equipment movement. It is the material electricians expect on large rigid terminations at panelboards and motor enclosures rather than a stamped steel nut.
4) Which Crouse-Hinds part number do I order for a 4-inch malleable iron locknut?
The part number is 20 from Crouse-Hinds, described as the 4-inch malleable iron threaded conduit locknut. That is the number to quote to a distributor or put on a submittal for the fitting.
5) Does the locknut go on the inside or the outside of the panel wall?
Either. The Crouse-Hinds 20 is designed to bear against the inside or outside surface of the enclosure wall, locking the conduit in place. Common practice on a threaded rigid termination is a locknut outside and a locknut plus bushing inside, which is why these are usually bought in pairs per opening.
6) Can I use this on EMT?
No. The Crouse-Hinds 20 is a threaded locknut for threaded raceway, rigid metal conduit or IMC. EMT is not threaded, so it terminates with a set-screw or compression connector instead, and that connector's own locknut is what secures it to the box.
How fast can I get the Crouse-Hinds CRS20 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Crouse-Hinds CRS20 come with a warranty?
Absolutely. The Crouse-Hinds CRS20 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Crouse-Hinds CRS20?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Crouse-Hinds CRS20 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!