NSI Industries 403-I - Straight Malleable Iron AC/MC/FMC connector. 3/8" trade size. UL listed for sizes 14/4 to 6/3 AC/MC/MCIA. For use with 3/8" trade size FMC.
NSI Industries

403-I

UPC: 781747104038


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Overview

The NSi Industries 403-I Straight Malleable Iron AC/MC/FMC Connector is a robust, UL-listed solution engineered for secure electrical installations requiring 3/8" trade size conduit connections. Designed for use with AC, MC, and FMC cables ranging from 14/4 to 6/3 AWG, this connector ensures reliable performance in demanding industrial and commercial environments. Constructed from durable malleable iron with an electro-zinc plated finish, the 403-I delivers exceptional corrosion resistance and mechanical strength, meeting UL and CSA certification standards (UL File No: E-23018, CSA File No: LR-2884). Key features include a lay-in lug design for simplified installation, a thermoplastic insulator rated for 150°C (302°F) applications, and a unique saddle design that secures cables with holding power exceeding listing agency requirements. The connector's insulated throat reduces wire pulling effort by up to 50%, while the included locknut ensures a vibration-resistant, concrete-tight seal when mounted to enclosures or conduit bodies. Compatible with 3/8" trade size flexible metal conduit (FMC), the 403-I is ideal for applications requiring quick, leak-proof connections in rigid and intermediate metal conduit systems. Available with optional DURA-PLATE® finish for enhanced corrosion protection, the 403-I is manufactured in the USA and meets NFPA 70 (NEC) and NEMA FB1 standards. Its compact dimensions (4.781" x 3.193" x 1.310") and lightweight design (0.975 lbs) make it suitable for tight spaces and high-density installations. Whether used in power distribution, motor control centers, or industrial machinery, the 403-I provides a dependable, code-compliant connection solution for electrical contractors and engineers.
  • UL Listed for 14/4 to 6/3 AC/MC/MCIA cables and 3/8" trade size FMC
  • Malleable iron construction with electro-zinc plating for corrosion resistance
  • Thermoplastic insulator rated for 150°C (302°F) applications
  • Lay-in lug design simplifies installation and reduces wire pulling effort by 50%
  • Includes locknut for vibration-resistant, concrete-tight seal

Specifications

Angle
180 Deg
Application
For use with AC/MC/MCIA in Steel or Aluminum in sizes from 14/4 to 6/3 and FMC in 3/8" trade sizes.
Conductor Range
14/4 to 6/3 AC/MC/MCIA
Connector Type
Squeeze, Insulated
Finish
Zinc Plated
Material
Malleable Iron - Zinc Plated
Number Of Conductors
1 Cable
Size
3/8 IN
Special Features
NPSM Threads ROHS Compliant
Standard
cULus
Temperature Rating
105?°C
Trade Size
3/8 IN
Type
Connector
Package Weight (Imperial)
0.079 L
Package Weight (Metric)
0.036 kg
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Frequently Asked Questions

What is the trade size of the 403-I connector?

The trade size of the 403-I connector is 3/8 inches.

Is the 403-I connector UL listed?

Yes, the 403-I connector is UL listed under standard 514B.

What is the finish of the 403-I connector?

The finish of the 403-I connector is zinc plated.

What is the catalog ID for the 403-I connector?

The catalog ID for the 403-I connector is 403-I.

What materials is the 403-I connector made from?

The 403-I connector is made from malleable iron and is zinc plated.

What sizes of AC/MC/MCIA can the 403-I connector accommodate?

The connector accommodates AC/MC/MCIA sizes from 14/4 to 6/3.

What types of conduit can the 403-I connector be used with?

The 403-I connector can be used with AC, MC, MCIA, and FMC conduit.

What is the UPC number for the 403-I connector?

The UPC number for the 403-I connector is 78174710403.

What is the standard packaging quantity for the 403-I connector?

The standard packaging quantity for the 403-I connector is 500 units.

What is the Federal Specification Number for the 403-I connector?

The Federal Specification Number for the 403-I connector is A-A-50553.

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