Overview
The Southwire Components 660S is a heavy-duty 4 in. EMT compression-type connector engineered for joining electrical metallic tubing (EMT) to boxes and enclosures. Constructed from steel with a zinc-plated finish, this connector delivers concrete-tight performance and arrives pre-assembled with a steel locknut for faster installation. Sold as a 6-pack. Designed to meet demanding construction environments and the strictest electrical codes, the 660S is backed by UL, CSA, NEMA, and military specifications.
Features
- Compression-type connection — no set screws, no loosening over time
- Concrete-tight rating for use in poured concrete applications
- Pre-assembled with a steel locknut for installation speed
- Also available with insulated throat for additional conductor protection
- Steel construction with zinc-plated finish for corrosion resistance
- UL File Numbers E18472 and E148716
Specifications
| Catalog Number | 660S |
|---|---|
| Conduit Size | 4 in. |
| Connection Type | Compression |
| Material | Steel |
| Finish | Zinc Plated |
| Includes | Steel locknut (pre-assembled) |
| Pack Quantity | 6 |
| Application | EMT to box or enclosure |
| UL Standard | UL 514B |
| UL File Numbers | E18472, E148716 |
| Federal Spec | A-A-50553, W-F-406D, W-F-406E, W-F-408D, W-S-610D |
| NEMA/ANSI | FB-1-2014 |
| CSA | Certified |
| Country of Origin | Unknown |



