Buna-N HNBR FKM Rubber O Rings 2" 3" 4" for Figure 206 Hammer Unions
O ring seal rings suitable for below hammer unions:
Figure 201
Pressure Rating: 3,000 psi NSCWP
Sizes: 2" and 2.5"
Figure 26H
Sizes: 4"
Pressure Rating: 400 psi NSCWP
Figure 206
Sizes: 1" ~10"
Pressure Rating: 2,000 psi NSCWP
Figure 207
Sizes: 3" 4" 6"
Pressure Rating: 2,000 psi NSCWP
Figure 211
Sizes: 2" 3"
Pressure Rating: 2,000 psi NSCWP
Figure 300
Sizes: 0.5" ~2"
Pressure Rating: 2,000, 2,500, and 12,500 psi NSCWP
We also supplier other Lip seal rings for Figure 602, figure 607, figure 1002, figure 1003, figure 1502 and Figure 2002.
Functionality
The primary function of the seal in a hammer union is to prevent leaks and maintain pressure within the piping system. It ensures a secure connection between different sections of pipes or hoses, even under extreme conditions.
Materials
Seals used in hammer unions are typically made from robust elastomeric materials, such as:
Nitrile Rubber (NBR): Known for its oil resistance, NBR is commonly used in moderate temperature and pressure situations.
FKM: A fluoroelastomer that offers excellent chemical and heat resistance, suitable for harsher environments.
HNBR (Hydrogenated Nitrile): Provides improved temperature and ozone resistance compared to standard NBR.
Design Features
Steel-Backed Rings: Many hammer union seals are designed with a steel backing, providing added strength and ensuring consistent pressure application across the sealing surface.
Profiled Sealing Surface: The design of the seal often includes a profiled surface to enhance sealing ability and accommodate slight irregularities in the mating surfaces.
Applications
Hammer union seals are used in various applications, including:
Drill stem testing and blowout preventers in drilling operations.
High-pressure mud and cement lines.
Manifold systems and pipelines that require quick, secure connections.
Performance Considerations
The effectiveness of a hammer union seal is determined by its ability to maintain integrity under pressure, exposure to different temperatures, and resistance to chemicals present in transported fluids.
Regular inspection and replacement are crucial, especially in high-wear environments, to avoid potential failures.
Size: |
1" 1.5" 2" 3" 4" 6" 7" 8" |
Material: |
Buna/FKM/HNBR/PTFE/PU etc. |
Types: |
rubber/ rubber+brass back-up/rubber+ss back-up |
all rubber types
Brass back-up rings type:

Stainless steel backup rings type:

Available sizes list:
1" 1502, Buna / FKM/ HSN
1-1/2" 1502, Buna / FKM/ HSN
2" 1502, Buna / FKM/ HSN
3" 602/1502, Buna / FKM/ HSN(Brass/Stainless Anti-Ext)
4" 602/1002/1502, Buna / FKM/ HSN(Brass/Stainless Anti-Ext)
2" FIG 206, Buna / FKM/ HSN
3" FIG 206, Buna / FKM/ HSN
4" FIG 206, Buna / FKM/ HSN
6" FIG 206, Buna / FKM/ HSN
8" FIG 206, Buna / FKM/ HSN
Our main products including but not limited:
- Rubber O rings
- Gaskets & Washers
- Hammer Union Repair Kits
- Swivel Repair Kits
- Plug Valve Seal Kits
- Wireline Setting Tool
- Swabing Tool Cups
- Oil Saver Rubber
- Rubber Packer Elements
- Custom Rubber Products
- Composite Seals(rubber bonded to plastic or metal)
Welcome to contact us for more details.