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ISO-K HV Half Nipples

ISO-K HV Half Nipples

ISO-K HV Half Nipples: Clamp-Style Single-Flange Connections for High-Vacuum Systems

ISO-K HV Half Nipples from TFM are robust, precision-fabricated components used in high-vacuum (HV) systems for modular or welded line construction. Each half nipple features one ISO-K flange on one end of a 304L stainless steel tube, while the other end is left open for welding or adaptation—making it an ideal solution for system extensions, chamber ports, or foreline connections.

The ISO-K flange, part of the Large ISO standard, is designed for clamp-fastened connections using centering rings and o-rings. This allows for fast, tool-less assembly, making ISO-K HV Half Nipples well-suited for reconfigurable vacuum setups and quick-service designs.

Key Features of ISO-K HV Half Nipples:

  • 304L Stainless Steel Tubing
    Delivers exceptional vacuum compatibility, corrosion resistance, and mechanical strength—ideal for cleanroom, semiconductor, and R&D environments.

  • Single ISO-K Flange Interface
    The clamp-style ISO-K flange enables quick, reliable assembly with centering rings and elastomeric o-rings, supporting vacuum levels down to 10⁻⁸ Torr.

  • Weld-Ready Open End
    The opposite end is plain for orbital welding or custom termination, offering flexibility in vacuum system layout or direct chamber integration.

  • Standard and Custom Configurations
    TFM offers ISO-K half nipples in common flange sizes such as ISO63, ISO100, ISO160, and ISO200, with options for custom lengths, wall thicknesses, and flange combinations on request.

  • Vacuum-Clean and Leak-Tested
    Each unit is helium-leak tested and cleaned to HV standards, ensuring integrity and low outgassing in critical applications.

Applications Include:

  • Foreline and process line terminations

  • Chamber port extensions or modifications

  • Quick-access points for gauges or valves

  • Weldable transitions to non-flanged system components

  • Modular vacuum hardware development

TFM also manufactures ISO-K full nipples (dual flanged) and ISO-K reducer nipples (conical or straight), and offers all supporting accessories including ISO quick clamps, centering rings with o-rings, and ISO blanking flanges.

In summary, ISO-K HV Half Nipples offer a clean, flexible, and vacuum-compliant solution for clamp-based ISO flange connections. Their durable stainless steel construction and modular design make them indispensable for both standard and customized high-vacuum configurations.

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Bore Overall Length Dim A Part Number
ISO63-K (3.74" OD) Half Nipple, Clamp Style 304L SS Tooltip 2-1/2 2.37 3.94 3.94 QF63-LBK
ISO80-K (4.33" OD) Half Nipple, Clamp Style 304L SS Tooltip 3 2.87 3.94 3.94 QF80-LBK
ISO100-K (5.12" OD) Half Nipple, Clamp Style 304L SS Tooltip 4 3.87 3.94 3.94 QF100-LBK
ISO160-K (7.09" OD) Half Nipple, Clamp Style 304L SS Tooltip 6 5.83 3.94 3.94 QF160-LBK
ISO200-K (9.45" OD) Half Nipple, Clamp Style 304L SS Tooltip 8 7.76 3.94 3.94 QF200-LBK
ISO250-K (11.42" OD) Half Nipple, Clamp Style 304L SS Tooltip 10 9.75 3.94 3.94 QF250-LBK
ISO320-K (14.57" OD) Half Nipple, Clamp Style 304L SS Tooltip 12-3/4 12.42 3.94 3.94 QF320-LBK
ISO400-K (17.72" OD) Half Nipple, Clamp Style 304L SS Tooltip 16 15.62 3.94 3.94 QF400-LBK
ISO500-K (21.65" OD) Half Nipple, Clamp Style 304L SS Tooltip 20 19.62 3.94 3.94 QF500-LBK
ISO630-K (27.17" OD) Half Nipple, Clamp Style 304L SS Tooltip 24 23.5 3.94 3.94 QF630-LBK

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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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