Aseptic Clamp Fittings Conforming To Din 11864-3 Standard

To select a DIN 11864-3 aseptic clamp connection for pharmaceutical or biotech service, follow this sequence: (1) specify 316L stainless steel (1.4404) with electropolished finish (Ra ≤ 0.8 μm); (2) choose Form A design with O-ring in a precision groove for crevice-free sealing; (3) verify clamp connection type—grooved ferrule and collar ferrule held by an external clamp; (4) confirm O-ring material (EPDM, silicone, or PTFE) matches process temperature. This combination delivers dead-space-free sealing, metallic centering, and CIP/SIP compatibility.

What Distinguishes DIN 11864-3 Form A?

The DIN 11864-3 Form A aseptic clamp connection was developed for processes requiring absolute sterility. Unlike older standards such as DIN 11851, this design features:

• O-ring in a precision groove – Prevents dead spaces where product residues accumulate.

• Metallic centering – Male and female ferrules align precisely, ensuring consistent O-ring compression.

• External clamp – Quick-release clamp enables tool-free assembly and disassembly.

DIN 11864-3 vs. DIN 11864-1 and -2

The clamp connection (Part 3) is the most common choice for sterile processing lines due to quick-release capability. A DIN 11864-3 aseptic clamp connection uses ferrules butt-welded to tubing.

Clamp Connection Components

A DIN 11864-3 Form A connection consists of four main components:

• Grooved ferrule (NKS) – Contains the O-ring groove on the male side.

• Collar ferrule (BKS) – Features a raised collar that centers against the grooved ferrule.

• O-ring – Sits in the groove, providing the seal. EPDM is standard for pharmaceutical service.

• Clamp – Applies compression around the ferrules, creating a leak-tight joint.

A din 11864 3 form a connection with PTFE or EPDM O-rings supports repeated sterilization cycles. The din 11864 3 standard covers dimensional tolerances, ensuring interchangeability between suppliers.

Material and Surface Finish Requirements

• Body material – 316L (1.4404) provides corrosion resistance against CIP chemicals.

• Internal finish – Hygiene Class H3 (Ra ≤ 0.8 μm) for pharmaceutical; H4 (Ra ≤ 0.4 μm) for ultra-high purity.

• Electropolishing – Removes surface imperfections and improves cleanability.

O-ring Material Selection

CIP and SIP Compatibility

• Crevice-free geometry allows cleaning solutions to reach all wetted surfaces.

• O-ring in precision groove withstands steam sterilization up to 150°C.

• Quick-release clamp enables easy maintenance and inspection.

Installation and Operational Guidance

• Welding – Butt-weld ferrules per DIN 11866. Orbital welding recommended.

• O-ring installation – Ensure correct seating in groove. Replace if damaged.

• Clamp tightening – Apply even compression. Use clamps specified for DIN 11864-3.

• Inspection – Check O-ring and ferrule surfaces during routine maintenance.

Final Selection Logic

For aseptic clamp connections in pharmaceutical and biotech applications:

1. Define service (WFI, buffer, product, CIP/SIP).

2. Select DIN 11864-3 Form A with 316L stainless steel.

3. Specify surface finish (Ra ≤ 0.8 μm for pharma; Ra ≤ 0.4 μm for ultra-purity).

4. Choose O-ring material (EPDM for general; silicone or PTFE for higher temperatures).

5. Verify clamp compatibility and pressure rating (up to 40 bar for small diameters).

6. Confirm CIP/SIP compatibility and sterilization temperature.

This approach ensures a DIN 11864-3 aseptic clamp connection delivers reliable, contamination-free sealing. The crevice-free design, metallic centering, and O-ring seal provide the sterility and cleanability that pharmaceutical and biotech manufacturing requires.

DIN 11864-3 Aseptic Clamp Connection

• This Tri clamp connection couplings set fully follows the regulation in DIN 11864-3 standard. Material needs to be 316L to meet aseptic requirement of food, chemical and pharmaceutical industries. 
• It is available in virtually all sizes, standards and configurations and it means you can optimize conditions inside your process whilst you are maintaining security on the outside according to different requirements. In addition to the quick connect we offer sterile unions threaded connections  and sterile flanged connections for maximum security. The design incorporates use of a standard dimension o-ring which gives flexibility of material choice.

Product Description

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