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90° KF (QF) HV Miter Elbows

90° KF (QF) HV Miter Elbows

90° KF (QF) HV Miter Elbows are precision-engineered components designed for high-vacuum (HV) and ultra-high-vacuum (UHV) systems. These elbows facilitate a sharp 90-degree directional change in vacuum piping while maintaining optimal gas flow and minimal pressure drop.

Key Features

  • Material: Manufactured from high-purity stainless steel (304L or 316L) to ensure durability, corrosion resistance, and minimal outgassing.

  • Mitered 90° Bend: Offers a compact, space-efficient design for systems requiring sharp directional changes.

  • KF (QF) Flange Connection: Compatible with ISO-KF (QF) vacuum fittings, enabling quick and easy assembly without welding.

  • Leak-Tight & High-Precision Fabrication: Ensures airtight performance for demanding HV/UHV applications.

  • Custom Sizes Available: Various diameters and wall thicknesses to fit different vacuum system configurations.

Applications

  • Semiconductor Manufacturing – Supports thin film deposition, ion implantation, and plasma processing.

  • Vacuum Coating & Sputtering Systems – Ideal for optical coatings, solar panel production, and decorative coatings.

  • Research & Laboratory Equipment – Used in mass spectrometers, particle accelerators, and high-energy physics applications.

  • Industrial High-Vacuum Systems – Essential for aerospace, pharmaceutical, and chemical processing industries.

Why Choose TFM’s 90° KF (QF) HV Miter Elbows?

  • High-precision machining for leak-free performance

  • Constructed from premium stainless steel for long-term durability

  • Optimized for high-vacuum and ultra-high-vacuum environments

  • Available in custom configurations upon request

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Wall Thickness Part Number
KF16 (1.18" OD) Elbow, 90 Degree Mitered 6061-T6 Aluminum Tooltip 7/8 0.144 QF16-075-EAL
KF16 (1.18" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 3/4 0.065 QF16-075E90M
KF25 (1.57" OD) Elbow, 90 Degree Mitered 6061-T6 Aluminum Tooltip 1.28 0.168 QF25-100-EAL
KF25 (1.57" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 1 0.065 QF25-100E90M
KF40 (2.16" OD) Elbow, 90 Degree Mitered 6061-T6 Aluminum Tooltip 1.83 0.108 QF40-150-EAL
KF40 (2.16" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 1-1/2 0.065 QF40-150E90M
KF50 (2.95" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 2 0.065 QF50-200E90M

Accessories Table

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

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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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