SU-4
1/4" Stainless Steel Tube Union – Sanitary Compression Fitting
- Model: SU-4 (1/4" tube union, 316 stainless steel)
- Type: Straight Union (tube-to-tube compression fitting)
- Material: 316 Stainless Steel (corrosion-resistant alloy)
- Pressure Rating: Suitable for high-purity and high-pressure systems (based on tubing specs)
- Size: 1/4" tube outer diameter (O.D.) x 1/4" tube O.D.
- Finish: Polished surface for clean, sanitary connections
- Equivalent To: Swagelok® SS-400-6
| Inch/Metric | Inch |
|---|---|
| Tube Outside Diameter D | 1/4in, mm |
| Width Across Flats h | 1/2in |
| Dimension A | 15.24mm |
|---|---|
| Dimension B | 17.78mm |
| Dimension I | 26.16mm |
| Dimension L | 40.89mm |
| Dimension d [Min] | 4.82mm |
1/4" Stainless Steel Tube Union – Sanitary Compression Fitting (SU-4)
The SU-4 is a 1/4" stainless steel compression union engineered for hygienic fluid processors and high-purity applications. It delivers secure, leak-tight performance in sanitary and industrial systems where cleanliness and precision are critical.
Constructed from 316 stainless steel, the SU-4 resists corrosion and supports Clean-in-Place (CIP) operations with no need for sealants or additional treatments. It’s ideal for pharmaceutical, biotech, and food-grade systems requiring long-term durability and reliable fluid control.
Easy to install and compatible with standard tubing, this union fitting is a solid choice for engineers designing or maintaining lab skids, Original Equipment Manufacturer (OEM) fluid panels, and clean piping networks.
Key Benefits
- Seal: Compression-style metal seal, no sealants needed
- Durability: Resists vibration, thermal cycling, and frequent cleanings
- Maintenance: Reusable and easy to disassemble
- Compatibility: Integrates with 1/4" stainless or polymer tubing
- Material: 316 stainless steel supports sanitary and industrial specs
Typical Applications
- Clean-in-Place (CIP) systems and sanitary tubing
- Hygienic valve connections
- Original Equipment Manufacturer (OEM) fluid control panels
- Lab and biotech skids
- Food-grade and pharmaceutical lines
Looking for a Swagelok® SS-400-6 alternative? The SU-4 offers the same precise fluid control and reliability with sanitary-grade performance.
| Swagelok® | 400-6 |
|---|---|
| Parker (Alok)® | 4SC4 |
| Hy-Lok® | CUA-4 |
| Tylok (CBC-Lok)® | 4-DU |
| Ham-Let (Let-Lok)® | 762L 1/4 |
| Hoke (Gyrolok)® | 4U |
| Dk-Lok® | DU-4 |
| Bi-Lok (Series D)® | DUA-4 |
| SSP (DUlok)® | D4U |
