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KF (QF) HV to Male NPT Adapters

TFM’s KF (QF) HV to Male NPT Adapters are designed to bridge the gap between high-vacuum (HV) systems and standard National Pipe Thread (NPT) fittings. With robust construction and precision engineering, these adapters ensure a leak-tight and reliable connection for your vacuum applications.

Key Features:

  • High-Quality Materials: Manufactured from 304L stainless steel or 6061-T6 aluminum, ensuring corrosion resistance and durability in challenging environments.
  • Seamless Connection: Converts KF (QF) HV flanges to standard male NPT threads for versatile compatibility.
  • Leak-Tight Design: Equipped with high-performance elastomeric o-rings for maintaining vacuum integrity.
  • Easy Installation: Features a straightforward design that ensures hassle-free integration into existing systems.
  • Pressure and Temperature Compatibility: Operates effectively in pressure ranges up to 10⁻⁸ torr and temperatures from 0°C to 120–180°C, depending on the o-ring material.
  • Versatile Applications: Ideal for use in laboratory research, semiconductor manufacturing, and industrial vacuum systems.

Product Range:

  • Available in various KF sizes (e.g., KF16, KF25, KF40, KF50).
  • Multiple NPT thread sizes to suit diverse requirements.

TFM offers high-precision KF (QF) HV to Male NPT Adapters that provide exceptional performance in demanding environments. Contact us today to find the right adapter for your specific needs!

Ordering Table

Flange Size/OD Fitting Note Part Number
KF16 (1.18" OD) 1/8" Male NPT — QF16XMNPT2
KF16 (1.18" OD) 1/4" Male NPT — QF16XMNPT4
KF16 (1.18" OD) 3/8" Male NPT — QF16XMNPT6
KF16 (1.18" OD) 1/2" Male NPT — QF16XMNPT8
KF25 (1.57" OD) 1/8" Male NPT — QF25XMNPT2
KF25 (1.57" OD) 1/4" Male NPT — QF25XMNPT4
KF25 (1.57" OD) 3/8" Male NPT — QF25XMNPT6
KF25 (1.57" OD) 1/2" Male NPT — QF25XMNPT8
KF25 (1.57" OD) 3/4" Male NPT — QF25XMNPT12
KF25 (1.57" OD) 1" Male NPT — QF25XMNPT16
KF40 (2.16" OD) 1/8" Male NPT — QF40XMNPT2
KF40 (2.16" OD) 1/4" Male NPT — QF40XMNPT4
KF40 (2.16" OD) 1/2" Male NPT — QF40XMNPT8
KF40 (2.16" OD) 3/4" Male NPT — QF40XMNPT12
KF40 (2.16" OD) 1" Male NPT — QF40XMNPT16
KF40 (2.16" OD) 1-1/4” Male NPT — QF40XMNPT20
KF40 (2.16" OD) 1-1/2” Male NPT — QF40XMNPT24
KF50 (2.95" OD) 1/8" Male NPT QF50XMNPT2
KF50 (2.95" OD) 1/4" Male NPT — QF50XMNPT4
KF50 (2.95" OD) 1/2" Male NPT — QF50XMNPT8
KF50 (2.95" OD) 3/4" Male NPT — QF50XMNPT12
KF50 (2.95" OD) 1" Male NPT — QF50XMNPT16
KF50 (2.95" OD) 2” Male NPT — QF50XMNPT32

 

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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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