DIN 11851 Complete Expanding-End Union Assembly
A complete DIN 11851 expanding-end pipe union assembly pairing a slotted round nut, DIN-14R expanding liner, DIN-15R expanding male end, and union seal. Listed in SS304 and SS316L stainless steel across DN15 to DN150 nominal sizes.
Material options | SS304, SS316L |
|---|---|
Size range | DN15~DN150 |
Interface series | DIN |
Connection | Union (Expanding End Assembly) |
Shape | Round (Slotted Round Nut) |
Size
Product overview
Complete Expanding Union Assembly & Component Charts
The DIN 11851 expanding union assembly joins process tubing via an internally grooved expanding liner (DIN-14R), an externally threaded expanding male end (DIN-15R), an elastomer seal ring, and a slotted round union nut.
The composite source drawing also tabulates a Blank Liner (DIN-14B) for cap-off configurations; keep each component chart distinct when verifying part dimensions.
Material Options & Size Coverage
Page summary and parameter tables list SS304 and SS316L (AISI 304 and AISI 316L) across DN15 to DN150 with a surface finish of Ra < 0.8 μm, while the embedded expanding union drawing tables list 13 nominal rows from DN10 to DN150 (with male threads from Rd28×1/8" to Rd190×1/4").
Match the tube-side bore, outer sleeve diameter, and Rd thread row across both the 14R liner and 15R male tables for the required line size.
Tube-End Process Boundary & Maintenance
While the source describes removable union maintenance and names the ends Expanding, it does not specify expansion tooling, tube wall tolerances, or installation procedures; confirm the tube-expanding process separately.
In dairy, beverage, brewing, and pharmaceutical lines, unthreading the slotted round nut allows straightforward seal inspection and replacement.
Technical specifications
Product specifications
- Media / applications
- Water
- Surface finish
- Ra<0.8um
Dimensional reference · Expanding Liner (DIN-14R) JOU-D14R
Listed14R liner dimensions for this DIN expanding union; tooling, expansion allowance and procedure require separate confirmation.
| DN | A | B | C | D | H1 |
|---|---|---|---|---|---|
| 10 | 12.2 | 18 | 22.5 | 10 | 17 |
| 15 | 18.2 | 24 | 28.5 | 16 | 17 |
| 20 | 22.2 | 30 | 36.5 | 20 | 18 |
| 25 | 28.2 | 35 | 44 | 26 | 22 |
| 32 | 34.2 | 41 | 50 | 32 | 25 |
| 40 | 40.2 | 48 | 56 | 38 | 26 |
| 50 | 52.2 | 61 | 68.5 | 50 | 28 |
| 65 | 70.3 | 79 | 86.0 | 66 | 32 |
| 80 | 85.3 | 93 | 100 | 81 | 37 |
| 100 | 104.3 | 114 | 121 | 100 | 44 |
| 101.6 | 101.8 | 114 | 121 | 100 | 54 |
| 125 | 129.3 | 137 | 150 | 125 | 34 |
| 150 | 154.3 | 163 | 176 | 150 | 37 |
Dimensional reference · Expanding Male (DIN-15R) JOU-D15R
Listed 15R expanding-union male-end sizes; match the mating dimensions within one complete size row.
| DN | A | B | C | D | H |
|---|---|---|---|---|---|
| 10 | 12.2 | 18 | Rd28×1/8" | 10 | 21 |
| 15 | 18.2 | 24 | Rd34×1/8" | 16 | 21 |
| 20 | 22.2 | 30 | Rd44×1/6" | 20 | 24 |
| 25 | 28.2 | 35 | Rd52×1/6" | 26 | 29 |
| 32 | 34.2 | 41 | Rd58×1/6" | 32 | 32 |
| 40 | 40.2 | 48 | Rd65×1/6" | 38 | 33 |
| 50 | 52.2 | 61 | Rd78×1/6" | 50 | 35 |
| 65 | 70.3 | 79 | Rd95×1/6" | 66 | 40 |
| 80 | 85.3 | 93 | Rd110×1/4" | 81 | 45 |
| 100 | 104.3 | 114 | Rd130×1/4" | 100 | 54 |
| 101.6 | 101.8 | 114 | Rd130×1/4" | 100 | 54 |
| 125 | 129.3 | 137 | Rd160×1/4" | 125 | 46 |
| 150 | 154.3 | 163 | Rd190×1/4" | 150 | 50 |
Need a different size, connection or document?
Discuss your requirements
