NSI Industries N-350 - Copper Split Bolt Connector 350 MCM Copper Split Bolt Connectors are high-strength solderless service connectors made of high-copper alloy for copper and copperweld wires. Type for two maximum wire sizes.
NSI Industries

N-350

UPC: 662381020109

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Overview

The NSI Industries N-350 Copper Split Bolt Connector is a high-strength, solderless service connector engineered for reliable electrical connections in copper and copperweld wire applications. Made from high-copper alloy, this connector delivers superior corrosion resistance and mechanical strength, ensuring long-term performance in demanding environments. The N-350 accommodates wire sizes from 4/0 AWG (0.258 in.) to 350 MCM (0.682 in.), making it ideal for heavy-duty industrial, utility, and commercial installations. Key specifications include UL486A listing for wire connections and UL486D listing for direct burial applications, with a recommended torque of 650 inch-pounds for optimal electrical and mechanical integrity. The connector features a durable design with a nut hex for proper torquing using standard tools, and a pressure bar that ensures secure wire retention across the full range of supported conductor combinations. Applications include power distribution, grounding systems, and service connections where high-current carrying capacity and durability are critical. The N-350 is part of NSI Industries' trusted line of split bolt connectors, known for their wide wire range-taking capability, which minimizes inventory requirements and simplifies procurement. For use in environments requiring UL-certified components up to 600V and 90°C temperature rating, the N-350 provides a dependable solution for professionals who demand performance and compliance.
  • UL486A listed for copper/copperweld wire connections
  • UL486D listed for direct burial applications
  • Accommodates 4/0 AWG to 350 MCM wire sizes
  • Recommended torque: 650 inch-pounds
  • High-copper alloy construction for corrosion resistance
  • Pressure bar ensures secure wire retention
  • Compatible with standard socket/box/open-end wrenches
  • Temperature rated up to 90°C, 600V applications

Specifications

Application
Wire Termination
Color
Copper
Connection Type
Solderless
Environmental Conditions
90 C
Finish
Copper
Housing Material
Copper
Material
High-copper alloy
Material
Copper
Number Of Conductors
2
Number Of Poles
1
Size
L=2.440 - W=1.220 IN
Size
350 MCM
Special Features
4/0 STR-350 MCM - 4 Pack
Standard
UL486B
Temperature Rating
90 C
Temperature Rating, Maximum
194 F
Temperature Rating, Maximum
90 C
Temperature Rating, Minimum
194 F
Temperature Rating, Minimum
90 C
Type
Copper Split Bolts
Voltage Rating
600 V
Warranty
1 Year
Wire Size
4/0 STR - 350 MCM
Wire Type
Class A & B
Package Dimensions (L x W x H)
1.181 IN x 1.22 IN x 2.362 IN
Package Dimensions (L x W x H)
2.9997 cm x 3.0988 cm x 5.9995 cm
Package Weight (Imperial)
0.830 L
Package Weight (Metric)
0.376 kg
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