What are Sanitary Pipe Fittings

What are Sanitary Pipe Fittings? Ultimate Guide

If you’re in the pharmaceutical, food processing, or any industry that demands high sanitary standards, hygienic grade fittings are likely a staple on your procurement list. But how much do you really know about sanitary fittings? This article aims to provide you with a comprehensive guide to hygienic grade fittings.

What are Sanitary Pipe Fittings Ultimate Guide

What are Sanitary Pipe Fittings?

What are Sanitary Pipe Fittings

Sanitary Pipe Fittings are primarily used to connect various auxiliary pipelines in pipeline systems within fields such as pharmaceuticals, food processing, and biotechnology. Typically made of stainless steel, these fittings adhere to specific hygiene standards in terms of material, surface roughness, structural design, production processes, and cleanliness. They ensure that fluid flow in the pipeline system remains uncontaminated, free from cross-contamination.


What Materials are Used in Sanitary Pipe Fittings?

Sanitary Pipe fittings typically utilize SUS304 and SUS316L stainless steel. These materials offer corrosion resistance and high-temperature tolerance, meeting the material requirements of hygienic grade pipeline systems.


What are the Types of Sanitary Fittings?

What are the Types of Sanitary Fittings

There are various types of Sanitary fittings available

Sanitary Couplings

A quick-release coupling, also known as a clamp or ferrule coupling, achieves rapid connection through clamping with a ferrule.

Sanitary unions

Sanitary union, also known as a “flexible joint” or “flexible connector,” is a commonly used pipe fitting that allows for easy installation and disassembly. It mainly consists of three parts: a nut, a cloud head, and a flat joint.

Sanitary elbows

It is divided by different connections, such as welded elbows, clamped elbows and union type elbows with DIN/SMS and 3A standards.

Sanitary reducers

It is divided by different connections, such as welded reducers, clamped reducers and union type reducers with DIN/SMS and 3A standards.

Sanitary Tees

They include short weld Tee, Long welded Tee, Clamped tee, threaded Tee which meet the different connection requests.


What is the Production Process of Sanitary Fittings?

Compared to standard fittings, the production process of hygienic grade fittings is more rigorous, covering manufacturing techniques, surface treatments, cleanliness inspections, and more. For instance, during manufacturing, both the external and internal surfaces of hygienic grade fittings undergo mechanical polishing to ensure surface roughness meets hygiene standards.


The Advantages and Disadvantages of Sanitary Pipe Fittings

The Advantages and Disadvantages of Sanitary Pipe Fittings


  1. Excellent corrosion resistance, unaffected by corrosive substances.
  2. High surface smoothness, preventing microbial growth.
  3. Rational structure, easy to clean.


  1. Higher cost.
  2. Stringent production standards and requirements, leading to manufacturing complexity.


What are the General Requirements for Sanitary Pipe Fittings?

General Requirements for Sanitary Pipe Fittings

Sanitary Pipe Fittings are typically employed in the production processes of industries such as pharmaceuticals, food and beverages etc., primarily involving the conveyance of liquids, gas, steam, and other media. These industries have strict requirements regarding the material, processing techniques, cleanliness, etc., to ensure product quality, safety, and hygiene. Therefore, the Sanitary fittings need to meet the following requirements:

Material Requirements: 

Typically made of corrosion-resistant, non-toxic materials like stainless steel, ensuring product purity and hygiene by avoiding leaching substances.

Processing Technique Requirements: 

Specialized machinery and processing techniques are employed for hygienic grade pipelines to ensure that the interior surface meets the required level of smoothness.

Interface Connection Requirements: 

Usually, hygienic grade flange connections, clamp connections, threaded connections, etc., are utilized to ensure the sealing and hygiene of the connections.



In summary, Sanitary Pipe fittings differ significantly from standard fittings in terms of materials, production processes, and application scenarios. The main characteristics of hygienic grade fittings include high material quality, precise dimensions, smooth inner surfaces, ease of cleaning and disinfection, and corrosion resistance. However, the manufacturing requirements for hygienic grade fittings are relatively strict, demanding cleanliness and precision, which is why they are more expensive than standard fittings.




 The Definition and Difference between Food Grade and Hygienic Grade Pipelines

Hygienic grade (also known as sanitary) is a general term encompassing food grade, pharmaceutical grade, and similar standards. In the food industry, domestic references can be made to the “QB/T2467-2017 Stainless Steel Pipes for Food Industry.” However, in the pharmaceutical industry, standards are typically referenced from international hygienic standards such as 3A, DIN, ISO, and BEP. BT can supply local and international standards of Sanitary fittings, PLEASE CONTACT US IF YOU HAVE ANY REQUIREMENTS.


How many Surface Finish Levels for Sanitary or Hygienic Grade Pipe/ Pipe Fittings?

Grade 14: Ra 0.012~0.03μm, 14k mirror stainless steel, providing an outstanding surface appearance (ultra-fine polished stainless steel)

Grade 13: Ra 0.015~0.02μm, 12k mirror stainless steel, offering an exceptional surface appearance (super-fine polished stainless steel)

Grade 12: Ra 0.02~0.16μm, 10k mirror stainless steel, delivering an excellent surface appearance (fine polished stainless steel)

Grade 11: Ra 0.1~0.2μm, 8k mirror stainless steel, providing a good surface appearance (polished stainless steel)

Grade 10: Ra 0.2~0.3μm, 6k mirror stainless steel, BA stainless steel, as shipped from the steel factory

Grade 9: Ra 0.4μm, 4k with almost no shine, also known as 2B surface (matte) without any brightness

Grade 8: Ra 0.8μm, without a mirror-like effect, might show slight processing marks, representing an unpolished surface.

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