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ISO-F HV Bolt Rings (Al)

ISO-F HV Bolt Rings (Al)

ISO-F HV Bolt Rings (Al): Complete Flange Fastening for ISO-K to ISO-F High-Vacuum Connections

ISO-F HV Bolt Rings (Al) are purpose-built components used to connect ISO-K and ISO-F flanges in high-vacuum (HV) systems, providing a secure, standardized method for joining dissimilar ISO flange types. These bolt rings are made from lightweight aluminum and come as a complete assembly, including the retaining ring, to ensure proper alignment, uniform pressure distribution, and vacuum sealing.

In vacuum technology, ISO flanges—commonly referred to as Large ISO flanges—are categorized into two interface types: ISO-K, which uses clamp fasteners, and ISO-F, which relies on nut-and-bolt fastening. ISO-F HV Bolt Rings serve as the critical linking hardware that enables mating between these two types, particularly in hybrid vacuum systems where both styles coexist.

Manufactured from corrosion-resistant Aluminum 6061-T6, these bolt rings offer strength without adding significant weight to the system, making them especially suitable for applications requiring frequent disassembly, overhead mounting, or mobile vacuum equipment. Their modular design simplifies both new installations and system retrofits.

Key Features of ISO-F HV Bolt Rings (Al):

  • Mating Function
    Specifically designed to join ISO-F and ISO-K flanges of the same nominal size in high-vacuum plumbing and chamber interfaces.

  • Lightweight Aluminum Construction
    Reduces system load while maintaining rigidity and mechanical reliability, ideal for cleanroom or portable setups.

  • Complete Assembly
    Each unit includes both the bolt ring and retaining ring, offering a ready-to-install solution that eliminates the need for separate part sourcing.

  • High-Vacuum Compatibility
    Supports standard centering ring and o-ring sealing for ISO flanges, enabling vacuum performance down to 10⁻⁸ Torr, depending on system design and elastomer selection.

  • Ease of Maintenance
    Ideal for modular systems where connections are frequently broken or reconfigured, enabling fast, tool-accessible tightening with standard hardware.

ISO-F HV Bolt Rings (Al) are available in a full range of ISO sizes, including ISO63, ISO100, ISO160, ISO200, ISO250, ISO320, and ISO400. Each ring is precision-machined to ensure concentric alignment and proper fit with ISO-compliant flange surfaces and fastening hardware.

For users seeking partial replacement, TFM also offers separate ISO-F retaining rings, which do not include the bolt ring. This option is suitable for maintenance tasks or systems where the original bolt ring remains in place.

In summary, ISO-F HV Bolt Rings (Al) offer a lightweight, durable, and fully integrated solution for bridging ISO-K and ISO-F flange systems in high-vacuum applications. Their precise fit, corrosion resistance, and ease of installation make them indispensable for engineers building or maintaining large vacuum infrastructure.

Ordering Table

ISO-F HV Bolt Rings (Al)

Flange OD Reference Part Number
ISO63 Bolt Ring Assembly QF63-RF
ISO80 Bolt Ring Assembly QF80-RF
ISO100 Bolt Ring Assembly QF100-RF
ISO160 Bolt Ring Assembly QF160-RF
ISO200 Bolt Ring Assembly QF200-RF
ISO250 Bolt Ring Assembly QF250-RF
ISO320 Bolt Ring Assembly QF320-RF
ISO400 Bolt Ring Assembly QF400-RF
ISO500 Bolt Ring Assembly QF500-RF

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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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