SMS Union Fitting
SMS Union Fitting for Dairy Fittings
Emirerri Steel is a trusted manufacturer and global exporter of SMS Union Fittings designed specifically for dairy, food, beverage, brewery, and pharmaceutical applications. Engineered under SMS 1145 standards, these fittings ensure maximum hygiene, easy maintenance, and leak-free performance in sanitary pipeline systems.
Our SMS Unions are crafted from premium stainless steel grades 304, 304L, 316, and 316L, offering excellent resistance to corrosion, heat, and pressure. They are ideal for applications requiring frequent cleaning (CIP/SIP) and reliable assembly/disassembly without compromising cleanliness.
Key Features
Conforms to SMS 1145 International Standard
High corrosion resistance suitable for dairy and food-grade environments
Smooth inner surface finish minimizing contamination risk
Leak-proof sealing with precision-machined threads
Easy installation, maintenance, and cleaning
Available with EPDM, PTFE, NBR, or Silicone gaskets
Custom sizes and surface finishes available on request
Suitable for welded, threaded, and plain-end connections
Specification
| Parameter | Description |
|---|---|
| Product Name | SMS Union Fittings |
| Standard | SMS 1145 |
| Material Grades | Stainless Steel 304 / 304L / 316 / 316L |
| Gasket Materials | EPDM, PTFE, NBR, Silicone |
| Surface Finish | Mirror Polish / Matt Finish (Ra ≤ 0.8 µm) |
| End Connection | Welded / Plain / Threaded / Hose Tail |
| Temperature Range | -20°C to +200°C (depending on gasket type) |
| Pressure Rating | Up to 10 bar (145 psi) |
| Size Range | 1” to 4” (25.4 mm – 101.6 mm) |
| Thread Type | SMS Thread |
| Design Type | Union Type (Male Part, Liner, Nut, Gasket) |
| Testing | 100% Pressure & Dimensional Inspection |
| Certification | ISO 9001:2015, PED, CE Marking Available |
Types of SMS Union Fittings
SMS Male Part – External thread, connects with liner
SMS Liner (Female Part) – Internal sealing face
SMS Nut – Holds male and liner parts together
SMS Gasket – Provides tight, hygienic sealing
Complete SMS Union Set – Includes all components for assembly
Available in Butt Weld End, Plain End, and Hose Tail End connections for versatile installation.
SMS Union Fittings – Standard & Grades List
Standard
Design Standard: SMS 1145
Thread Standard: SMS (Swedish Manufacturing Standard)
Application Standards:
3A Sanitary Standard
DIN 11851 / ISO / IDF (for compatibility reference)
BS 4825 Part 4 (Hygienic Fittings Standard)
Testing & Certification:
100% Dimensional & Pressure Testing
ISO 9001:2015 Certified
CE / PED Compliance (on request)
Material Test Certificates (EN 10204 3.1 / 3.2)
Available Material Grades
| Material Type | Grade | Equivalent ASTM / AISI | EN / W.Nr. |
| Austenitic Stainless Steel | SS 304 | ASTM A182 F304 | 1.4301 |
| SS 304L | ASTM A182 F304L | 1.4307 | |
| SS 316 | ASTM A182 F316 | 1.4401 | |
| SS 316L | ASTM A182 F316L | 1.4404 | |
| Optional Grades (On Request) | SS 321 | ASTM A182 F321 | 1.4541 |
| SS 317L | ASTM A182 F317L | 1.4438 | |
| SS 904L | ASTM A182 F904L | 1.4539 |
Gasket / Seal Material Options
| Gasket Material | Color | Temperature Range | Applications |
|---|---|---|---|
| EPDM | Black | -40°C to +120°C | Dairy, Beverage, Water Systems |
| NBR (Buna-N) | Black | -30°C to +110°C | Oils, Fats, and Hydrocarbon Fluids |
| PTFE (Teflon) | White | -60°C to +200°C | Chemical and Pharmaceutical Applications |
| Silicone | Translucent | -50°C to +200°C | Food & High-Temperature Applications |
Surface Finishes
Internal Finish: Mirror Polish (Ra ≤ 0.8 µm for hygienic use)
External Finish: Bright or Matt Polish
Electropolishing: Available on request for pharmaceutical-grade fittings
End Connection Options
Welded End
Plain End
Threaded End
Hose Tail End
Compliance & Testing
Hydrostatic Test: Conducted at 1.5 times working pressure
Pneumatic Leak Test: 6 bar (optional)
Material Traceability: Heat Number Marked
Third-Party Inspection: Available (BV, TUV, DNV, SGS)
Dimensions
| Size (Inch) | Size (mm) | Nut OD (mm) | Thread Type |
|---|---|---|---|
| 1” | 25.4 mm | 56 mm | SMS Thread |
| 1.5” | 38.1 mm | 70 mm | SMS Thread |
| 2” | 50.8 mm | 85 mm | SMS Thread |
| 2.5” | 63.5 mm | 98 mm | SMS Thread |
| 3” | 76.2 mm | 112 mm | SMS Thread |
| 4” | 101.6 mm | 138 mm | SMS Thread |
Applications
Dairy & Milk Processing Plants
Food & Beverage Processing Units
Brewery & Distillery Equipment
Pharmaceutical & Biotech Plants
Cosmetic & Personal Care Production Lines
Water Treatment & Filtration Systems