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The dairy coupling, also known as the milk coupling, is designated in the industry according to the DIN 11851 standard. This standardization ensures that every DIN 11851 coupling is compatible with one another. The dairy fitting is actually quite simple. It consists of a male piece, a threaded piece, a nut, and a sealing ring in between. Together, these components form the milk coupling. Additionally, other dairy fitting components are available, such as blind male pieces, blind nuts, sight glasses, nut sight glasses, sight glass tubes, and many more dairy couplings. Naturally, we offer DIN couplings for hoses, but also weldable dairy couplings and DIN 11851 couplings with threads. In addition to standard DIN 11851 coupling connections, there are endless possibilities to connect the DIN 11851 coupling with other standards, such as DIN 11851 to Tri-Clamp coupling or IBC to DIN 11851. The latter is referred to as an IBC dairy coupling. This allows you to connect an IBC tank to your system to hygienically transfer beverages, juices, liquids, sauces, and pastes. These specialized couplings, also called milk couplings, ensure hygienic connections between pipes and other components within dairy installations. Dairy couplings that comply with the DIN 11851 standard meet strict European regulations.
The dairy fitting, or DIN 11851 coupling, is a hygienic connection between two components. For example, to connect a dairy hose to a beer tank or to connect a pipe to a tank that does not need to remain permanently in place, you use couplings that are easy to disconnect but remain hygienic, ensuring no residues are left in the hose, pipe, or coupling. If residues remain, they can spoil, making the connection unhygienic. The milk coupling is widely used in breweries and distilleries, where hygiene is critical, but flexibility and efficiency are also important. For every dairy installation, we have the right milk coupling and dairy fitting in stock. Even sizes as small as DN10 up to DN200 (8") can be delivered quickly.
Dairy fitting that complies with the DIN 11851 standard offer numerous advantages for companies in the food and dairy industry. They guarantee that production lines meet hygiene and safety standards, forming the basis for high-quality production processes. Whether processing milk, other dairy products, or foods such as sauces, juices, beverages, and pastes, the dairy fitting ensures a leak-proof, hygienic connection. The dairy coupling is designed to withstand high pressure and temperatures, making it ideal for demanding production lines. At Nexaparts, we offer a wide range of various hygienic and sanitary couplings, including those compliant with DIN 11853. This makes our range versatile and flexible, allowing us to meet the specific needs of various industries.
Choosing the right dairy fitting can raise several questions. Here are some frequently asked questions about the dairy fitting:
Although both standards are designed for hygienic applications, the dairy fitting is not directly compatible with other hygienic couplings. A transition coupling, such as the DIN 11851 to Tri-Clamp coupling, is required. It is important to consult a specialist to determine compatibility or consider dairy fitting adapters where necessary.
Regular maintenance and inspection are essential for optimal performance. Depending on the intensity of use and cleaning processes, it is recommended to inspect the dairy fitting every six months and replace the sealing ring or damaged parts as needed to prevent leaks or contamination in the dairy fitting.
The dairy fitting is available in two standard materials: stainless steel 304 and stainless steel 316. The stainless steel 304 version is often used in non-critical systems where material purity is not extremely important. When the dairy fitting comes into contact with food products, it is recommended to choose the stainless steel 316 variant, which offers better hygienic resistance and is safer for food applications.
The dairy fitting system is actually quite simple. To connect two dairy fitting, you always need a male side and a female side. The male side has threads on the outside, and the coupling end has a groove for the sealing ring. The female side has a nut with a male piece. With the nut, you tighten the male piece against the male part, so it is clamped against the dairy seal. Essentially, you screw the female coupling (male piece/nut) onto the male coupling (threaded piece).
Can’t find the right dairy fitting? There’s a good chance we can supply it. No matter how unique the transition is, we can custom-weld it for you. Our TIG welders are highly experienced in welding sanitary connections. Inquire below about the possibilities for your custom dairy fitting. We are happy to assist with questions about our products and provide advice to help you make the right choice for your specific application. Whether you’re looking for a milk coupling for your existing production line or couplings with a different DIN standard, our team is ready to help. We are available via email, WhatsApp, or phone for advice. Feel free to browse our website for other products that may be relevant to your dairy installation.
| DN 10 | Rd28x1/8" |
| DN 15 | Rd34x1/8" |
| DN 20 | Rd44x1/6" |
| DN 25 | Rd52x1/6" |
| DN 32 | Rd58x1/6" |
| DN 40 | Rd65x1/6" |
| DN 50 | Rd78x1/6" |
| DN 65 | Rd95x1/6" |
| DN 75 | Rd104x1/6" |
| DN 80 | Rd110x1/4" |
| DN 90 | Rd120x1/4" |
| DN 100 | Rd130x1/4" |
| DN 125 | Rd160x1/4" |
| DN 150 | Rd190x1/4" |
| DN 200 | Rd240x1/4" |
| DIN Size | Inner Diameter (mm) | Inner Diameter Nut (mm) | Outer Thread Diameter (mm) |
| DN10 | 9.9 | 25.3 | |
| DN15 | 31.3 | ||
| DN20 | 19.7 | ||
| DN25 | 24.6 | 48.1 | 51.5 |
| DN32 | 31.8 | 54.3 | 57.2 |
| DN40 | 36.3 | 61.6 | 64.6 |
| DN50 | 49.3 | 74.5 | 77.4 |
| DN65 | 66.5 | 90.9 | 94.4 |
| DN75 | 72 | 100.4 | |
| DN80 | 80.5 | 100.9 | 109.2 |
| DN100 | 99.4 | 124.7 |
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