Why Standards Diverge
Sanitary fittings evolved regionally: DIN in Germany, SMS in Scandinavia, 3A in the United States, with ISO and IDF used across dairy and process equipment. Tube outside diameters, wall thicknesses and ferrule dimensions differ between them.
Parts from two standards can look interchangeable and still leave a step in the bore, which is where product collects and cleaning fails.
Identify What You Already Have
Before ordering, measure rather than assume. Three measurements usually settle it.
- Tube outside diameter at a straight section
- Wall thickness at a cut end or from the tube specification
- Ferrule outside diameter and the clamp size that fits it
- Photograph any markings on an existing fitting and send them with the enquiry
See the Tri-Clamp specification →
What To Specify When You Order
A complete fitting order answers five questions. Missing any of them usually means a second email before the quotation.
| Standard | DIN, SMS, 3A, ISO or IDF |
|---|---|
| Size range | DN15 to DN200, half inch to eight inch |
| Material | SS304 or SS316L |
| Finish | Mirror polish below Ra 0.5 um, or matt polish |
| Connection | Weld, clamp or thread |
Seals And Ratings Travel With The Fitting
Working pressure on our sanitary range is up to 1.0 MPa, which is 10 bar, with vacuum on the low side and a working temperature band of minus 5 to 95 degrees Celsius.
Gaskets are specified separately: silicone, EPDM or fluoroelastomer, chosen for the product and the cleaning chemistry rather than for size alone.
See the Sanitary Butterfly Valve specification →
Industrial Fittings Are A Different Family
Butt weld elbows, tees and flanges for industrial lines follow piping standards such as ANSI, ASTM, DIN, JIS, BS, ISO, GB, SH and HG. They are not polished for hygienic duty and they are not interchangeable with sanitary clamped fittings.
If both families appear on one site, keep the two line lists separate when ordering.
