Thomas & Betts 8421 Threadless Connector NSB Conduit Fittings

Description:

The Thomas & Betts 8421 Threadless Connector NSB is used to connect and effectively bond 1-1/4 inch rigid metal conduit (RMC) or intermediate metal conduit (IMC) to electrical boxes and enclosures without threading the conduit. Commonly installed in industrial facilities, commercial buildings, manufacturing plants, and utility electrical systems, this conduit fitting provides a secure mechanical connection and reliable grounding continuity. Maintenance teams and electrical contractors use this fitting for repair, retrofit, expansion, and replacement of rigid conduit installations. 

Applications:

The Thomas & Betts 8421 is designed for terminating or coupling threadless rigid metal conduit and IMC in electrical distribution systems. Its malleable iron construction and split steel ring with diagonal serrations provide a permanent, concrete-tight connection while ensuring positive grounding. The fitting is suitable for switchgear, motor control centers, electrical panels, industrial machinery, and commercial electrical installations where threadless conduit connections are required.

Technical Specifications:

• Manufacturer Part Number (MPN): 8421
• Brand: Thomas & Betts (ABB) – T&B Rigid Fittings
• Product Type: Threadless Connector
• Trade Size: 1-1/4 in.
• Conduit Type: Rigid Metal Conduit (RMC) / Intermediate Metal Conduit (IMC)
• Connection Type: Threadless
• Throat Type: Non-Insulated
• Material: Malleable Iron Body with Case-Hardened Steel Ring and Steel Locknut
• Finish: Electro Zinc-Plated Chromate Coating
• Diameter: 2-3/8 in.
• Length: 2-7/16 in.
• Thread Length: 11/16 in.
• Construction: Concrete-Tight
• Application: Connects and bonds threadless RMC/IMC conduit to boxes, enclosures, or couples threadless conduit sections
• Standards: UL 514B (UL File E23018), CSA C22.2, NEMA, Federal Specification WF-408, NFPA 70
• Compliance: RoHS 3 Compliant, REACH Compliant, TSCA Section 6(h) Compliant
• UPC: 786210084213
• Features: Split steel ring with diagonal serrations for positive grounding, permanent mechanical connection, eliminates conduit threading, corrosion-resistant construction, and suitable for industrial and commercial conduit systems.

Common Replacements:

• Thomas & Betts 8321
• Thomas & Betts 8521
• Thomas & Betts 8423