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ISO-F HV Half Nipples (Bolted)

ISO-F HV Half Nipples (Bolted)

ISO-F HV Half Nipples (Bolted): Precision-Welded Tubing for ISO-F High-Vacuum Connections

ISO-F HV Half Nipples (Bolted) from TFM are high-performance components designed for high-vacuum (HV) systems requiring secure, bolt-style flange connections. Each half nipple is constructed from corrosion-resistant 304L stainless steel tubing and features a single ISO-F flange, making it ideal for direct integration into vacuum chambers, foreline plumbing, or welded system extensions.

ISO-F flanges—often referred to as Large ISO flanges—are standardized under ISO 1609 and designed to be fastened with nuts and bolts, offering a rigid, stable connection. These nipples are widely used in industrial, research, and semiconductor applications where flange strength and structural permanence are essential.

Key Features of ISO-F HV Half Nipples (Bolted):

  • 304L Stainless Steel Tubing
    Offers excellent resistance to corrosion and thermal stress, making it suitable for cleanroom, reactive gas, and bakeout environments.

  • Single ISO-F Flange Interface
    One end of the tube is outfitted with a precision-machined ISO-F flange, designed to be joined using a bolt ring, centering ring, and elastomeric o-ring for a high-vacuum seal.

  • Weldable Open End
    The non-flanged end is left plain for orbital welding, butt welding, or further customization—ideal for OEM system integration or vacuum line fabrication.

  • High-Vacuum Sealing Performance
    Supports pressures down to 10⁻⁸ Torr, when used with proper sealing hardware, and maintains vacuum integrity in demanding operating conditions.

  • Standard and Custom Dimensions Available
    TFM offers ISO-F half nipples in common sizes such as ISO63, ISO100, ISO160, and ISO200, with options for custom lengths, wall thicknesses, and flange transitions.

These half nipples serve as foundational components in:

  • Vacuum chamber port extensions

  • Foreline or exhaust line terminations

  • Viewport or diagnostic equipment mounting

  • Transition interfaces to welded or modular piping

TFM also provides a comprehensive range of ISO-F accessories, including bolt rings, centering rings with Viton® or Buna o-rings, ISO-F blank flanges, and full or reducer nipples for complete system integration.

In summary, ISO-F HV Half Nipples (Bolted) provide a reliable, bolt-compatible solution for extending or adapting ISO-F flange ports in high-vacuum applications. Their robust construction, weldable flexibility, and vacuum-grade compatibility make them a key component in precision vacuum engineering.

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Bore Overall Length Dim A Part Number
ISO63-F (5.12" OD) Half Nipple, Bolt Style 304L SS Tooltip 2-1/2 2.37 3.94 3.94 QF63-LBF
ISO80-F (5.71" OD) Half Nipple, Bolt Style 304L SS Tooltip 3 2.87 3.94 3.94 QF80-LBF
ISO100-F (6.50" OD) Half Nipple, Bolt Style 304L SS Tooltip 4 3.87 3.94 3.94 QF100-LBF
ISO160-F (8.86" OD) Half Nipple, Bolt Style 304L SS Tooltip 6 5.83 3.94 3.94 QF160-LBF
ISO200-F (11.22" OD) Half Nipple, Bolt Style 304L SS Tooltip 8 7.76 3.94 3.94 QF200-LBF
ISO250-F (13.19" OD) Half Nipple, Bolt Style 304L SS Tooltip 10 9.75 3.94 3.94 QF250-LBF
ISO320-F (16.73" OD) Half Nipple, Bolt Style 304L SS Tooltip 12-3/4 12.42 3.94 3.94 QF320-LBF
ISO400-F (20.08" OD) Half Nipple, Bolt Style 304L SS Tooltip 16 15.62 3.94 3.94 QF400-LBF
ISO500-F (24.02" OD) Half Nipple, Bolt Style 304L SS Tooltip 20 19.62 3.94 3.94 QF500-LBF
ISO630-F (29.53" OD) Half Nipple, Bolt Style 304L SS Tooltip 24 23.5 3.94 3.94 QF630-LBF

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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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