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KF (QF) to Female NPT Adapters

KF (QF) to Female NPT Adapters

KF (QF) to Female NPT Adapters are precision-engineered components designed to connect KF (QF) vacuum flanges with National Pipe Thread (NPT) female connections. These adapters allow seamless integration of vacuum systems with threaded piping, ensuring a secure and leak-tight transition between different connection standards.

Key Features

  • Material: High-quality stainless steel (304 or 316L) for excellent corrosion resistance and durability.

  • Vacuum Compatibility: Designed for use in high-vacuum and ultra-high vacuum (UHV) applications.

  • Secure Sealing: Ensures a leak-proof connection between KF flanges and NPT-threaded components.

  • Easy Installation: Simple to connect with standard KF clamps and centering rings.

  • Multiple Sizes Available: Compatible with KF10, KF16, KF25, KF40, and KF50 flange sizes, with corresponding NPT female thread options.

Applications

  • Vacuum Systems: Used in research laboratories, semiconductor manufacturing, and industrial vacuum processing.

  • Gas and Fluid Transfer: Enables the connection of vacuum chambers with gas supply lines or liquid cooling systems.

  • HVAC and Industrial Applications: Provides compatibility between vacuum fittings and standard NPT plumbing.

Why Choose TFM’s KF to Female NPT Adapters?

  • Precision Machined: Manufactured to tight tolerances for reliable performance.

  • Wide Compatibility: Works with all standard KF (QF) flange systems and NPT-threaded components.

  • High Purity Materials: Ideal for cleanroom and high-vacuum environments.

Ordering Table

Flange Size/OD Type Fitting Part Number
KF10 (1.18" OD) Stainless Steel 1/8" Female NPT QF10XFNPT2
KF10 (1.18" OD) Aluminum 1/8" Female NPT QF10XFNPT2A
KF10 (1.18" OD) Stainless Steel 1/4" Female NPT QF10XFNPT4
KF10 (1.18" OD) Aluminum 1/4" Female NPT QF10XFNPT4A
KF16 (1.18" OD) Stainless Steel 1/8" Female NPT QF16XFNPT2
KF16 (1.18" OD) Aluminum 1/8" Female NPT QF16XFNPT2A
KF16 (1.18" OD) Stainless Steel 1/4" Female NPT QF16XFNPT4
KF16 (1.18" OD) Aluminum 1/4" Female NPT QF16XFNPT4A
KF25 (1.57" OD) Stainless Steel 1/8" Female NPT QF25XFNPT2
KF25 (1.57" OD) Aluminum 1/8" Female NPT QF25XFNPT2A
KF25 (1.57" OD) Stainless Steel 1/4" Female NPT QF25XFNPT4
KF25 (1.57" OD) Aluminum 1/4" Female NPT QF25XFNPT4A
KF25 (1.57" OD) Stainless Steel 3/8" Female NPT QF25XFNPT6
KF25 (1.57" OD) Stainless Steel 1/2" Female NPT QF25XFNPT8
KF25 (1.57" OD) Stainless Steel 3/4" Female NPT QF25XFNPT12
KF40 (2.16" OD) Stainless Steel 1/8" Female NPT QF40XFNPT2
KF40 (2.16" OD) Aluminum 1/8" Female NPT QF40XFNPT2A
KF40 (2.16" OD) Stainless Steel 1/4" Female NPT QF40XFNPT4
KF40 (2.16" OD) Aluminum 1/4" Female NPT QF40XFNPT4A
KF40 (2.16" OD) Stainless Steel 3/8" Female NPT QF40XFNPT6
KF40 (2.16" OD) Stainless Steel 1/2" Female NPT QF40XFNPT8
KF40 (2.16" OD) Stainless Steel 3/4" Female NPT QF40XFNPT12
KF50 (2.95" OD) Stainless Steel 1/8" Female NPT QF50XFNPT2
KF50 (2.95" OD) Aluminum 1/8" Female NPT QF50XFNPT2A
KF50 (2.95" OD) Stainless Steel 1/4" Female NPT QF50XFNPT4
KF50 (2.95" OD) Aluminum 1/4" Female NPT QF50XFNPT4A

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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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