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ASA HV O-Rings & Hardware

ASA HV Replacement O-Rings

ASA HV Replacement O-Rings: Reliable Elastomer Sealing for Grooved ASA Flanges

ASA HV Replacement O-Rings from TFM are precision-engineered elastomeric seals designed to provide leak-tight performance in ASA flange assemblies for high-vacuum (HV) systems. These o-rings are manufactured to fit the grooved face of ASA-style flanges, which form a seal against the smooth (flat) mating flange when compressed using bolts and washers.

Used across a wide range of vacuum chamber and foreline applications, these replacement o-rings restore system sealing integrity after disassembly, cleaning, or thermal cycling. They are essential consumables for vacuum technicians, OEM system builders, and cleanroom maintenance teams working with ASA standard flanges.

Key Features of ASA HV Replacement O-Rings:

  • Vacuum-Grade Elastomer Formulations
    Manufactured from high-purity fluorocarbon (FKM) rubber by default, these o-rings provide excellent chemical resistance and thermal stability—ideal for HV and process gas applications.

  • Precision-Molded for ASA Grooved Flanges
    Each o-ring is dimensioned to fit the standard o-ring groove geometry on ASA flange faces, ensuring proper compression and consistent vacuum sealing performance.

  • High-Vacuum Performance
    When properly seated and fastened, these o-rings maintain vacuum integrity down to 10⁻⁸ Torr, supporting both roughing lines and UHV-compatible chamber seals.

  • Temperature Compatibility
    Fluorocarbon o-rings support sustained operation between -20 °C to +200 °C, making them suitable for heated systems, bake-outs, and thermal cycling.

  • Cleanroom Ready
    O-rings are cleaned and packaged to vacuum-grade standards, reducing contamination risk and ensuring readiness for high-purity applications.

Applications Include:

  • Sealing ASA flange ports on vacuum chambers

  • Maintenance and rebuilds of ASA vacuum lines

  • Feedthrough or viewport sealing in ASA-grooved assemblies

  • Replacement of degraded or deformed o-rings in HV setups

  • Leak restoration in modular flange-based vacuum systems

TFM offers ASA HV Replacement O-Rings in standard sizes to match ASA 2-inch, 4-inch, 6-inch, 8-inch, 10-inch, 12-inch, and 14-inch flanges. Custom sizes and alternate compounds (e.g., Buna-N, EPDM, Chemraz®) are also available upon request for special chemical or temperature requirements.

For complete flange assembly, pair these o-rings with TFM’s ASA HV Bolt Sets, which include the bolts, washers, and nuts needed to securely fasten grooved-to-flat ASA flange pairs.

In summary, ASA HV Replacement O-Rings offer a dependable sealing solution for ASA flange-based high-vacuum systems. Their material resilience, precision fit, and vacuum compatibility make them an essential part of maintaining long-term performance and integrity in vacuum chambers and gas delivery infrastructure.

Ordering Table

Drawing Flange OD Reference O-Ring Size O-Ring Color O-Ring Material O-Ring Cross Section O-Ring ID O-Ring OD Part Number
Tooltip ASA1 (4.25" OD) O-ring Seals, Fluorcarbon (FKM) 223 Brown 9505-75 Fluorocarbon 0.139 1.609 1.887 O-V223
Tooltip ASA1.5 (5.00" OD) O-ring Seals, Fluorcarbon (FKM) 231 Brown 9505-75 Fluorocarbon 0.139 2.609 2.887 O-V231
Tooltip ASA2 (6.00" OD) O-ring Seals, Fluorcarbon (FKM) 238 Brown 9505-75 Fluorocarbon 0.139 3.484 3.762 O-V238
Tooltip ASA3 (7.50" OD) O-ring Seals, Fluorcarbon (FKM) 247 Brown 9505-75 Fluorocarbon 0.139 4.609 4.887 O-V247
Tooltip ASA4 (9.00" OD) O-ring Seals, Fluorcarbon (FKM) 258 Brown 9505-75 Fluorocarbon 0.139 5.984 6.262 O-V258
Tooltip ASA6 (11.00" OD) O-ring Seals, Fluorcarbon (FKM) 266 Brown 9505-75 Fluorocarbon 0.139 7.984 8.262 O-V266
Tooltip ASA8 (13.50" OD) O-ring Seals, Fluorcarbon (FKM) 274 Brown 9505-75 Fluorocarbon 0.139 9.984 10.262 O-V274
Tooltip ASA10 (16.00" OD) O-ring Seals, Fluorcarbon (FKM) 278 Brown 9505-75 Fluorocarbon 0.139 11.984 12.262 O-V278

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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