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KF (QF) HV Half Nipples (Aluminum 6061-T6)

KF (QF) HV Half Nipples (Brass)

KF (QF) HV Half Nipples (Brass): Compact Vacuum Fittings for Reliable Line Integration

KF (QF) HV Half Nipples (Brass) offer a streamlined, dependable solution for connecting vacuum components in high-vacuum (HV) systems. As single-flange connectors, these half nipples are particularly useful for joining standard tubing or custom assemblies to KF flanged hardware. Designed for compact and modular integration, they provide a cost-effective and space-saving option where only one vacuum flange is required.

Unlike full nipples that feature KF flanges on both ends, KF (QF) HV Half Nipples (Brass) come with a single KF (QF) flange and an open tube end. This configuration enables direct welding, brazing, or fitting into custom vacuum assemblies, foreline plumbing, or system terminations. They are frequently used in vacuum pump interfaces, instrumentation extensions, and chamber ports where a permanent or semi-permanent tube connection is needed.

TFM manufactures these brass half nipples with precision-machined KF flanges for compatibility with all standard quick-flange hardware. Each unit supports rapid, tool-free installation using centering rings and KF clamps, ensuring reliable sealing and minimal downtime during system integration or maintenance. The brass construction provides a valuable alternative to stainless steel in non-corrosive environments, offering excellent machinability and thermal conductivity while maintaining vacuum compatibility.

KF (QF) HV Half Nipples (Brass) are ideal for lower-load environments where the benefits of lighter weight and ease of modification are prioritized. They are frequently deployed in systems requiring frequent customization or where brass’s thermal and electromagnetic properties offer practical advantages—such as in certain analytical, optical, or RF-shielded vacuum assemblies.

As with all our KF vacuum components, TFM supports custom fabrication of brass half nipples to accommodate specific application needs. Whether your design calls for a non-standard tube diameter, special surface finish, or unique length, we can deliver tailored solutions while maintaining high vacuum performance standards.

In summary, KF (QF) HV Half Nipples (Brass) are compact, versatile, and ideal for vacuum users seeking reliable single-flange connections in foreline or chamber systems. They represent a critical component in the flexible construction of high-vacuum infrastructure—where efficiency, material adaptability, and precise fit are essential.

Ordering Table

Flange Size/OD Type Drawing Flange Material Part Number
KF16 (1.18" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF16-050-LFB
KF16 (1.18" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF16-062-LFB
KF16 (1.18" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF16-075-LFB
KF16 (1.18" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF16-087-LFB
KF25 (1.57" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF25-100-LFB
KF25 (1.57" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF25-112-LFB
KF40 (2.16" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF40-150-LFB
KF40 (2.16" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF40-162-LFB
KF50 (2.95" OD) Half Nipple, Clamp Style Tooltip 360 Brass QF50-200-LFB

Accessories Table

Description For Per Package Part Number
Cast Clamps (Aluminum) KF10, KF16 Flanges 1 QF16-075-C
Cast Clamps (Aluminum) KF25 Flanges 1 QF25-100-C
Cast Clamps (Aluminum) KF40 Flanges 1 QF40-150-C
Cast Clamps (Aluminum) KF50 Flanges 1 QF50-200-C
Lever Clamps (Aluminum) KF10, KF16 Flanges 1 QF16-075-CHA
Lever Clamps (Aluminum) KF25 Flanges 1 QF25-100-CHA
Lever Clamps (Aluminum) KF40 Flanges 1 QF40-150-CHA

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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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