NSI Industries 249-SLP - 4" Mighty-Align® EMT Steel Set Screw Slip Coupling
NSI Industries

249-SLP

UPC: 781747052490


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Overview

The 4" Mighty-Align® EMT Steel Set Screw Slip Coupling (SKU: 249-SLP) from NSI Industries delivers a secure, vibration-resistant connection for 4" Electrical Metallic Tubing (EMT) conduits. Constructed from durable steel, this coupling features a set screw design that maintains a tight fit under mechanical stress, preventing loosening in demanding installations. The slip coupling design enables easy alignment and adjustment during setup, reducing labor time without compromising reliability. Compatible with standard 4" EMT conduits, this coupling meets electrical safety and performance requirements for conduit systems. NSI Industries' Mighty-Align® series is trusted by electricians and contractors for precision engineering and long-lasting durability in industrial, commercial, and residential applications. The set screw mechanism ensures a firm grip on the conduit, while the slip feature allows for minor adjustments after initial installation. This product is manufactured in the US and carries the UNSPSC code 39131707.
  • 4" EMT steel slip coupling with set screw design
  • Vibration-resistant connection for secure conduit installations
  • Slip feature allows easy alignment and adjustment during setup
  • Compatible with standard 4" EMT conduits
  • Manufactured in the US by NSI Industries

Specifications

Application
Mighty-Align® "Slip" Style Coupling - Used to join two lengths of EMT together.Backing out center screw allows the slip coupling to be temporarily located on one cut end while adjacent end is slid into place.Back out center screw stop as necessary to slip coupling over conduit.Fully install center screw stop between conduits.Ensure that both ends of conduit are visible in sight hole.Tighten all set screws. Patented
Connection Type
Set Screw
Insulated
No
Material
Steel
Material Quality
Steel
Series
Mighty-Align®
Series
Mighty-Align
Size
4"
Standard
UL514B
Trade Size
4 in.
Type
Set Screw Slip
Package Weight (Imperial)
2.590 L
Package Weight (Metric)
1.175 kg
3/4" Made in the USA Steel Rigid Conduit Set Screw Coupling

3601-US

3/4" Made in the USA Steel Rigid Conduit Set Screw Coupling
Coupling, Set Screw, Made in the USA Steel. Size 1/2 Inch.

240-US

Coupling, Set Screw, Made in the USA Steel. Size 1/2 Inch.
Coupling, Set Screw, Made in the USA, Size 2 1/2 Inch.

246-US

Coupling, Set Screw, Made in the USA, Size 2 1/2 Inch.
Coupling, set Screw, Made in the USA Steel, Size 1 Inch.

242-US

Coupling, set Screw, Made in the USA Steel, Size 1 Inch.
1-1/4" Made in the USA Steel Rigid Conduit Set Screw Coupling

3603-US

1-1/4" Made in the USA Steel Rigid Conduit Set Screw Coupling
1-1/4" Mighty-Align® EMT Steel Set Screw Slip Coupling

243-SLP

1-1/4" Mighty-Align® EMT Steel Set Screw Slip Coupling
Coupling, Set Screw, Made in the USA, Size 3 Inch.

247-US

Coupling, Set Screw, Made in the USA, Size 3 Inch.
Coupling, Set Screw, Made in the USA Steel, Size 2 Inch.

245-US

Coupling, Set Screw, Made in the USA Steel, Size 2 Inch.
2" Made in the USA Steel Rigid Conduit Set Screw Coupling

3605-US

2" Made in the USA Steel Rigid Conduit Set Screw Coupling
1-1/2" Made in the USA Steel Rigid Conduit Set Screw Coupling

3604-US

1-1/2" Made in the USA Steel Rigid Conduit Set Screw Coupling
3-1/2" Mighty-Align® EMT Steel Set Screw Slip Coupling

248-SLP

3-1/2" Mighty-Align® EMT Steel Set Screw Slip Coupling
Coupling, Set Screw, Zinc Die Cast, Size 3 1/2 Inch

248-DC

Coupling, Set Screw, Zinc Die Cast, Size 3 1/2 Inch

Frequently Asked Questions

What is the patent number for this coupling?

The patent number for the Mighty-Align slip coupling is D702,542.

What is the purpose of the 249-SLP coupling?

The 249-SLP Mighty-Align® "Slip" Style Coupling is used to join two lengths of EMT together.

What material is the 249-SLP coupling made from?

The primary material for the 249-SLP coupling is steel.

What is the finish of the 249-SLP coupling?

The 249-SLP coupling has a zinc plated finish.

What is the trade size of the 249-SLP coupling?

The trade size for the 249-SLP coupling is 4 inches.

How many couplings are in a standard package?

The standard package quantity for the 249-SLP coupling is 6 units.

What are the dimensions of the 4-inch coupling?

For the 4-inch trade size, Dimension A is 5.252 and Dimension B is 4.995.

What UL Standard does this coupling meet?

The 249-SLP coupling meets UL Standard UL-514B.

What is the Federal Specification Number for this product?

The Federal Specification Number for this coupling is A-A-50553.

What NEMA Standard applies to the 249-SLP?

The 249-SLP coupling conforms to NEMA Standard FB-1.

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