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ISO250 HV Flanges

Introduction

ISO250 HV Flanges are standardized high-vacuum (HV) components designed for reliable, repeatable connections in large-diameter vacuum systems. As part of the ISO-K / ISO-LF flange family, ISO250 flanges are widely used in industrial vacuum equipment, thin-film deposition systems, semiconductor tools, and scientific research installations where stable vacuum sealing and modular assembly are critical.

Their robust mechanical design and international standardization make ISO250 HV flanges a preferred solution for medium-to-high vacuum ranges, especially in systems requiring frequent assembly, disassembly, or expansion.

Detailed Description

ISO250 HV flanges conform to ISO 1609 and ISO 2861 standards and feature a nominal flange size of 250 mm. The sealing mechanism relies on a centering ring combined with an elastomer O-ring (typically Viton®), secured by claw clamps or bolt-type clamps. This design enables fast installation while maintaining dependable vacuum integrity.

Manufactured primarily from high-grade stainless steel (such as 304 or 316L), ISO250 flanges offer excellent corrosion resistance, mechanical strength, and compatibility with clean and reactive vacuum environments. Precision machining ensures flat sealing surfaces, tight tolerances, and consistent alignment across mating components.

Compared with CF (ConFlat) flanges, ISO250 HV flanges are optimized for higher throughput and easier handling at large diameters, making them especially suitable for coating chambers, vacuum furnaces, and large research systems where ultra-high vacuum is not required but stability and scalability are essential.

Applications

ISO250 HV Flanges are commonly used in:

  • Thin-film deposition systems: sputtering, evaporation, and coating chambers

  • Semiconductor equipment: load locks, transfer chambers, and process modules

  • Vacuum furnaces: heat treatment and materials processing

  • Research vacuum systems: physics, materials science, and surface engineering

  • Industrial vacuum pipelines: pumps, traps, valves, and large vacuum vessels

Technical Parameters

ParameterTypical Value / RangeImportance
Nominal SizeISO250 (DN250)Defines system compatibility
StandardISO 1609 / ISO 2861Ensures global interchangeability
MaterialStainless Steel 304 / 316LCorrosion resistance & cleanliness
Sealing MethodElastomer O-ring with centering ringReliable HV sealing
Clamp TypeClaw clamp / Bolted clampSecure mechanical connection
Vacuum RangeHigh Vacuum (HV)Suitable for most industrial systems
Surface FinishPrecision-machinedImproves sealing reliability

Comparison with Related Vacuum Flanges

Flange TypeKey AdvantageTypical Application
ISO250 HVFast assembly, large diameterCoating & industrial vacuum systems
CF (DN250)Metal seal, UHV capableUltra-high vacuum research
KF (NW)Compact, quick connectSmall vacuum lines
ANSI / JISStructural strengthIndustrial piping (non-vacuum-optimized)

FAQ

QuestionAnswer
What vacuum level is ISO250 suitable for?ISO250 flanges are designed for high-vacuum applications, not UHV.
Can ISO250 flanges be reused?Yes, with proper inspection and replacement of O-rings if needed.
Are custom materials or finishes available?Yes, alternative materials and surface treatments can be provided on request.
What accessories are required?Centering ring, O-ring, and clamps are required for sealing and connection.

Packaging

Our ISO250 HV Flanges are individually protected, clearly labeled, and securely packaged to prevent surface damage during storage and transportation. Protective wrapping and reinforced cartons or crates are used to ensure dimensional accuracy and surface integrity upon delivery.

Conclusion

ISO250 HV Flanges offer a dependable, industry-standard solution for large-diameter high-vacuum connections. With excellent mechanical stability, ease of installation, and global compatibility, they are well-suited for thin-film deposition, semiconductor processing, and industrial vacuum systems requiring flexibility and reliability.

For drawings, compatibility details, or a quotation, please contact us at sales@thinfilmmaterials.com

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Bore Counter Bore Thickness Bolt Circle Dia. Bolt Hole Dia. # of Bolt Holes Minimal Number of Clamps Part Number
ISO250-F (13.19" OD) Blank, Bolt Style 6061-T6 Aluminum Tooltip 10 — — 0.63 12.205 0.433 12 — QF250-ABF
ISO250-F (13.19" OD) Bored, Bolt Style 304L SS Tooltip 10 9.88 10.020 0.63 12.205 0.433 12 — QF250-SWF
ISO250-F (13.19" OD) Blank, Bolt Style 304L SS Tooltip 10 — — 0.63 12.205 0.433 12 — QF250-BF
ISO250-F (13.19" OD) Bored, Bolt Style 316L SS Tooltip 10-1/2 10.276 10.530 0.63 12.205 0.433 12 — QF250-SWF-M
ISO250-K (11.42" OD) Blank, Clamp Style 6061-T6 Aluminum Tooltip 10 — — 0.47 — — — 6 QF250-ABK
ISO250-K (11.42" OD) Blank, Clamp Style 304L SS Tooltip 10 — — 0.47 — — — 6 QF250-BK
ISO250-K (11.42" OD) Bored, Clamp Style 304L SS Tooltip 10 9.88 10.020 0.47 — — — 6 QF250-SWK
ISO250-K (11.42" OD) Bored, Clamp Style 316L SS Tooltip 10-1/2 10.276 10.530 0.47 — — — 6 QF250-SWK-M

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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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