NSI Industries 239-I - Connector, Set Screw, Steel, Insulated Throat, Size 4 Inch
NSI Industries

239-I

UPC: 781747102393


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Overview

The NSi Industries 239-I is a 4-inch set screw connector designed for rigid and intermediate metal conduit systems. Constructed from hardened steel, this connector delivers superior strength and durability in industrial applications. Its insulated throat reduces wire pulling effort by up to 50%, enhancing installation efficiency while preventing electrical arcing. The captive hex head screws ensure a secure, vibration-resistant connection that meets UL 514B and CSA C22.2 No. 18 standards. Certified for concrete tight installations, the 239-I is ideal for power distribution, manufacturing machinery, and commercial electrical systems where reliable, code-compliant connections are critical. Compatible with 4-inch conduit, this connector eliminates the need for threading while providing a ground path through the steel body. Finished with electro zinc plating and chromate coating for corrosion resistance, it meets NFPA 70-1999 (ANSI) and Federal Specification W-F-408 requirements.
  • 4-inch size for rigid/intermediate metal conduit systems
  • Hardened steel construction with electro zinc plating for corrosion resistance
  • Insulated throat reduces wire pulling effort by up to 50%
  • Captive hex head screws ensure vibration-resistant, secure connections
  • UL 514B and CSA C22.2 No. 18 certified for concrete tight installations

Specifications

Application
Used to secure steel EMT to box or enclosure. Concrete-tight when taped. Plastic insulator rated 105 degree C.
Connection Type
Set Screw
Connector Type
Set Screw
Finish
Zinc Electroplated
Insulation
Insulated Throat
Material
Steel
Material Quality
Steel
Series
239
Size
4 IN
Special Features
Furnished with Tri-Drive slot/Phillips/Robertson head screws
Standard
cULus
Temperature Rating, Maximum
221 F
Temperature Rating, Maximum
105 C
Temperature Rating, Minimum
221 F
Temperature Rating, Minimum
105 C
Trade Size
4 in.
Type
Connector
Package Weight (Imperial)
2.500 L
Package Weight (Metric)
1.134 kg
Connector, Set Screw, Steel, Insulated Throat, Size 2-1/2 Inch

236-I

Connector, Set Screw, Steel, Insulated Throat, Size 2-1/2 Inch
Set Screw Coupling, Concrete Tight, Conduit Size 3-1/2 Inches, Length 4.687 Inches, Material Zinc Plated Steel, For use with EMT Conduit

TK129A

Set Screw Coupling, Concrete Tight, Conduit Size 3-1/2 Inches, Length 4.687 Inches, Material Zinc Plated Steel, For use with EMT Conduit

Frequently Asked Questions

What is the standard package quantity for the 239-I?

The standard package quantity for the 239-I connector is 6 units.

What certifications does the 239-I connector hold?

It meets Federal Specification A-A-50553, NEMA Standard FB-1, and UL Standard UL-514B (UL File E24001).

What are the physical dimensions of the 239-I connector?

The dimensions are A: 4-1/4 in, B: 3-3/4 in, and C: 4-13/16 in.

Is the connector suitable for concrete applications?

Yes, the connector is concrete-tight when it is taped.

What is the trade size of the 239-I connector?

The trade size of the 239-I connector is 4 inches.

What is the temperature rating for the insulator?

The plastic insulator within the connector is rated for 105 degrees C.

What material is the 239-I connector made from?

The 239-I connector is made from steel and has a zinc electro-plate finish.

What is the primary application of this connector?

This connector is used to secure steel EMT (Electrical Metallic Tubing) to a box or enclosure.

What material is the 239-I connector made from?

The 239-I connector is made from steel and has a zinc electro-plate finish.

What is the standard package quantity for the 239-I?

The standard package quantity for the 239-I connector is 6 units.

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