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

KF (QF) HV 316L SS Half Nipples (Metric Tube)

KF (QF) HV 316L SS Half Nipples (Metric Tube): Precision Vacuum Fittings for Metric-Based System Integration

KF (QF) HV 316L SS Half Nipples (Metric Tube) are expertly engineered components for high-vacuum (HV) systems that require metric tube compatibility, superior corrosion resistance, and reliable single-flange integration. These half nipples are designed with one KF (QF) flange and an open tube end, making them ideal for custom assemblies, vacuum pump lines, or integration into chamber ports where metric dimensions are standard.

At TFM, we manufacture these KF (QF) half nipples using high-purity 316L stainless steel, renowned for its enhanced resistance to corrosion and chemical attack. This makes the fittings especially suitable for chemically reactive or moisture-sensitive environments. The metric tube compatibility allows seamless incorporation into international systems, experimental setups, or OEM platforms where non-imperial specifications are required.

Unlike full-length nipples that feature two flanged ends, KF (QF) HV 316L SS Half Nipples (Metric Tube) focus on flexible, low-profile connection points. The single KF flange enables straightforward attachment to standard vacuum hardware, using centering rings and clamps for a quick, tool-free seal. The opposite tube end may be welded, brazed, or fitted into custom hardware, making it highly adaptable for permanent or semi-permanent installations.

Each unit is precision-fabricated to meet vacuum performance expectations, with smooth internal finishes that reduce outgassing and maintain system cleanliness. These half nipples are rated for high-vacuum conditions and are commonly used in semiconductor research, vacuum coating systems, and scientific instrumentation where material purity and dimensional precision are critical.

Standard sizes and tube lengths are available, but at TFM, we understand that vacuum infrastructure is rarely one-size-fits-all. That’s why we offer custom fabrication of KF (QF) HV 316L SS Half Nipples with metric tubing—whether you need specific diameters, longer spool lengths, or surface enhancements such as electropolishing for ultra-clean environments.

In summary, KF (QF) HV 316L SS Half Nipples (Metric Tube) provide a robust, corrosion-resistant, and metrically aligned solution for professionals designing or maintaining high-vacuum systems. Their durability, material integrity, and integration flexibility make them indispensable for precision vacuum applications across global platforms.

Ordering Table

Flange Size/OD Type Flange Material Drawing Part Number
KF10 (1.18" OD) Half Nipple, Clamp Style 304L SS Tooltip QF10-050-LF
KF16 (1.18" OD) Half Nipple, Clamp Style 304L SS Tooltip QF16-050-LF
KF16 (1.18" OD) Half Nipple, Clamp Style 304L SS Tooltip QF16-075-LF
KF25 (1.57" OD) Half Nipple, Clamp Style 304L SS Tooltip QF25-100-LF
KF40 (2.16" OD) Half Nipple, Clamp Style 304L SS Tooltip QF40-150-LF
KF40 (2.16" OD) Half Nipple, Clamp Style 304L SS Tooltip QF40-150-LFT
KF50 (2.95" OD) Half Nipple, Clamp Style 304L SS Tooltip QF50-200-LF
KF50 (2.95" OD) Half Nipple, Clamp Style 304L SS Tooltip QF50-200-LFT

Accessories Table

KF (QF) HV 316L SS Half Nipples (Metric Tube) 2

Description For Per Package Part Number
Cast Clamps (SS) KF10, KF16 Flanges 1 QF16-075-CS
Cast Clamps (SS) KF25 Flanges 1 QF25-100-CS
Cast Clamps (SS) KF40 Flanges 1 QF40-150-CS
Cast Clamps (SS) KF50 Flanges 1 QF50-200-CS
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
Centering Ring (SS with Fluorocarbon O-Ring) KF10 Flanges 1 QF10-050-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF16 Flanges 1 QF16-075-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF25 Flanges 1 QF25-100-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF40 Flanges 1 QF40-150-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF50 Flanges 1 QF50-200-SRV
Description For Per Package Part Number

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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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