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ISO-F HV Bolt Kits (tapped flanges)

ASA HV Bolt Sets

ASA HV Bolt Sets: Secure Mechanical Fastening for ASA High-Vacuum Flange Connections

ASA HV Bolt Sets from TFM are designed to provide reliable and consistent mechanical sealing force for ASA-style flanges in high-vacuum (HV) environments. ASA flanges—based on standards originally developed by the American Standards Association—feature a sexed sealing system, where one flange has a machined o-ring groove and the mating flange has a smooth, flat face.

These bolt sets contain all the necessary fasteners to join ASA flanges securely, ensuring proper compression of the fluorocarbon (FKM) o-ring that seals the connection. While the o-rings are sold separately, the bolt sets simplify installation by including properly sized bolts, nuts, and washers, reducing guesswork and ensuring system compatibility.

Key Features of ASA HV Bolt Sets:

  • Complete Fastening Solution
    Each bolt set includes all required hex head bolts, washers, and nuts for joining a pair of ASA flanges—ensuring uniform pressure and structural alignment.

  • Precision-Matched for ASA Flanges
    Designed specifically to match standard ASA bolt hole patterns and flange sizes, ensuring hassle-free compatibility during assembly.

  • High-Vacuum Application Ready
    When paired with a properly seated fluorocarbon o-ring, these bolt sets support vacuum integrity down to 10⁻⁸ Torr, making them suitable for demanding HV and cleanroom environments.

  • Durable Materials
    Bolts and hardware are manufactured from corrosion-resistant materials (e.g., zinc-plated or stainless steel) for longevity and stable torque under thermal cycling.

  • Simplified Installation
    Designed for flange assemblies where time, repeatability, and sealing integrity are critical—ideal for chamber ports, valve junctions, and serviceable vacuum connections.

Applications of ASA HV Bolt Sets:

  • Joining ASA grooved-to-flat vacuum flanges

  • Assembling high-vacuum chambers with sexed seals

  • Mounting feedthroughs or viewport flanges

  • Retrofitting or maintaining ASA-based vacuum hardware

  • Supporting systems requiring periodic disassembly and resealing

TFM also offers fluorocarbon (FKM) o-rings sized for ASA flanges, providing the sealing interface that fits into the grooved flange face. These o-rings are sold separately, allowing users to stock only what’s needed for replacement or clean assembly.

In summary, ASA HV Bolt Sets provide a robust and standardized solution for assembling ASA-style vacuum flanges in high-vacuum systems. With vacuum-rated materials, application-specific sizing, and compatibility with ASA o-ring sealing methods, these bolt kits simplify the build and maintenance of reliable vacuum interfaces.

Ordering Table

ASA Flange Per Package Length Thread Size Part Number
1 & 1.5 4 1.5 9/16-12 HBS563121504
2 & 3 4 1.75 5/8-11 HBS625111754
4 8 1.75 5/8-11 HBS625111758
6 & 8 8 2.5 3/4-10 HBS751025008
10 12 2.5 3/4-10 HBS751025012

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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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