TSI INOX Conduits presents our premium Stainless Steel UNF Explosion-Proof Union, a critical component for connecting and modifying conduit systems in hazardous area locations. Manufactured from premium SS316 (CF8M) stainless steel and featuring a mirror polished or #240 polished finish, our UNF unions provide secure, corrosion-resistant connections for rigid conduit and IMC in explosive environments.
The UNF (Explosion-Proof Female Union) is specifically designed for use in NEC/CEC Class I, II, and III hazardous locations to connect conduit to conduit, or to provide a means for future modification of the conduit system . Unlike the male UNY union which connects conduit to enclosures, the female UNF union provides a female-to-female connection, making it ideal for joining two pieces of threaded conduit or compensating for conduit cut too short . Whether you are installing in petrochemical refineries, chemical processing plants, offshore platforms, or food processing facilities, TSI's stainless steel UNF unions deliver the quality, durability, and code compliance your project demands.
TSI UNF unions meet or exceed the following hazardous location standards:
NEC/CEC Hazardous Location Ratings
Groups A, B, C, D – Flammable Gases and Vapors
Groups E, F, G – Combustible Dusts
Combustible Fibers and Flyings
| Specification | Details |
|---|---|
| Standard | UL 1203 – Explosion-Proof and Dust-Ignition-Proof Equipment |
| UL 886 | Electrical Fittings for Use in Hazardous Locations |
| CSA Standard | CSA C22.2 No. 25 & No. 30 – Enclosures & Explosion-Proof Enclosures |
| Material | Body: 316SS / Nut: CF8M (316SS) / Insert: 316SS |
| Finish | Mirror Polished / #240 Polished Finish – Body and Nut |
| Thread Type | Female NPT (National Pipe Taper) – Both Ends |
| Connection Type | Female to Female (Straight) |
| Conduit Type | Rigid/IMC (Intermediate Metallic Conduit) |
| Raintight Rating | NEMA 4X – Corrosion-resistant and watertight |
| Trade Sizes | ½" through 4" |
Certified for hazardous locations, providing superior safety and reliability in explosive and combustible environments. The rugged construction prevents internal explosions from propagating to the surrounding atmosphere.
Our UNF unions are manufactured from premium 316 stainless steel (cast CF8M), providing:
The polished finish provides:
The UNF union is specifically designed to provide a means for future modification of the conduit system, allowing for easy system changes and upgrades without disrupting the entire installation.
The three-piece construction (body, nut, and insert) provides:
TSI UNF explosion-proof unions are essential for:
UL 1203 - Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Hazardous Locations
UL 886 - Electrical Fittings for Use in Hazardous Locations
CSA C22.2 No. 25 & No. 30 - Enclosures for Electrical Equipment & Explosion-Proof Enclosures
NEMA 4X - Raintight and Corrosion-Resistant Enclosures
cULus Listed - Certified for Canada and United States
Group B Rated - Suitable for hydrogen and other Group B gases
TSI INOX Conduits provides a comprehensive stainless steel hazardous location system:
TSI INOX Conduits manufactures every UNF union using premium 316 stainless steel and state-of-the-art production processes, ensuring consistent dimensions, accurate threading, and flawless polished finishes in every product.
Based in India with a worldwide export network, TSI delivers stainless steel hazardous location conduit solutions to projects across North America, Europe, the Middle East, and beyond.
Our engineering team provides application assistance, code compliance guidance, and custom solutions to meet your exact project specifications
TSI INOX Conduits specializes in stainless steel hazardous location solutions for demanding industries, ensuring our products meet the unique requirements of each sector.
UNF Explosion-Proof Union (Female)
316SS (Body) / CF8M (Nut, Insert)
Mirror Polished / #240 Polished Finish
NPT (National Pipe Taper)
Female to Female (Straight)
Rigid and IMC
½", ¾", 1", 1¼", 1½", 2", 2½", 3", 4"
Group B (for hydrogen and other Group B gases)
Contact us today to discuss your requirements, request samples, or receive a competitive quote for bulk UNF explosion-proof unions.
Engineered for the Toughest Environments. Trusted Worldwide.
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