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NSI Industries 251-I - Connector, Compression, Steel, Insulated Throat, Size 3/4 Inch
NSI Industries

251-I

UPC: 781747102515


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Minimum Qty: 25

Multiplier: 25

*Contact for lower quantities*

Overview

The NSi Industries 251-I is a 3/4-inch steel compression connector designed for secure, leak-proof connections in industrial electrical systems. Engineered to join EMT (Electrical Metallic Tubing) to boxes or enclosures, this connector ensures concrete-tight installations with minimal effort. Constructed from durable steel with a zinc electro-plate finish, the 251-I delivers long-lasting corrosion resistance and reliable performance in demanding environments. Its insulated throat, rated to 105°C, provides enhanced safety by preventing electrical shorts and ground faults. The compression design eliminates the need for welding or threading, simplifying installation and reducing labor costs. Ideal for use in HVAC, plumbing, and mechanical systems, this connector is available in standard packaging of 25 units per box or bulk quantities. The 251-I is a versatile solution for both new installations and repairs, offering a tight seal that withstands vibration, moisture, and mechanical stress.
  • 3/4" trade size for EMT to box/enclosure connections
  • Steel construction with zinc electro-plate finish for corrosion resistance
  • Insulated throat rated to 105°C for enhanced safety
  • Concrete-tight design eliminates leaks and ensures secure installations
  • Compression design simplifies installation without welding or threading

Specifications

Application
Used to join EMT to box or enclosure. Concrete tight.
Connector Type
Compression
Finish
Zinc Electroplated
Insulation
Insulated Throat
Material
Steel
Material Quality
Steel
Size
3/4 IN
Special Features
Concrete-tight
Standard
cULus
Temperature Rating, Maximum
221 F
Temperature Rating, Maximum
105 C
Temperature Rating, Minimum
221 F
Temperature Rating, Minimum
105 C
Trade Size
3/4 in.
Type
Connector
Package Weight (Imperial)
0.179 L
Package Weight (Metric)
0.081 kg
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Frequently Asked Questions

What is the description of the 251-I product?

The 251-I is a compression connector made of steel with an insulated throat, size 3/4 inch.

What is the primary application of the 251-I connector?

The 251-I connector is used to join EMT to a box or enclosure and is concrete tight.

What material is used for the 251-I connector?

The 251-I connector is constructed from steel.

What type of finish does the 251-I connector have?

The 251-I connector features a zinc electro-plate finish.

Is the 251-I connector suitable for concrete installations?

Yes, the 251-I connector is concrete tight.

What is the trade size of the 251-I connector?

The trade size for the 251-I connector is 3/4 inch.

What UL standards does the 251-I connector meet?

The 251-I connector has UL File Number E24001 and meets UL Standard UL-514B.

What are the physical dimensions of the 251-I connector?

The dimensions are A: 1-13/32 in, B: 1-27/32 in, and C: 1-5/16 in.

Which NEMA standard applies to the 251-I connector?

The 251-I connector complies with NEMA Standard FB-1.

What is the Federal Specification Number for this product?

The Federal Specification Number for the 251-I connector is A-A-50553.

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