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ASA HV Flanges – Rotatable Grooved

ASA HV Flanges – Rotatable Grooved

ASA HV Flanges – Rotatable Grooved: Reliable O-Ring Sealing for ASA Standard High-Vacuum Interfaces

ASA HV Flanges – Rotatable Grooved, offered by TFM, are robust, sexed sealing components tailored for high-vacuum (HV) systems. Based on the long-established ASA flange standard—originally adapted from 150# steam-pipe flanges—these components use an o-ring groove to enable effective vacuum sealing when compressed against a mating flat flange.

Each grooved flange is rotatable, meaning it can spin freely around the tubing collar or weld stub prior to tightening, allowing for easy bolt-hole alignment in any system orientation. These flanges are machined from 304L stainless steel, offering strength, corrosion resistance, and weld compatibility in demanding vacuum environments.

Key Features of ASA HV Flanges – Rotatable Grooved:

  • Sexed Vacuum Seal Design
    The flange features a precision-machined groove to hold an elastomeric o-ring, creating a reliable seal when paired with a flat flange.

  • Rotatable Flange Functionality
    Enables flexible alignment during installation, especially useful in systems with constrained space or asymmetric layouts.

  • 304L Stainless Steel Construction
    Provides high strength and chemical resistance; ideal for use in cleanrooms, R&D facilities, and industrial vacuum applications.

  • Sized by Nominal Pipe I.D.
    Available in standard sizes:
    1″, 1.5″, 2″, 3″, 4″, 6″, 8″, and 10″, referencing the nominal inner diameter of the connecting tube.

  • Large Outer Diameter (O.D.) Profile
    Compared to other flange types, ASA flanges have larger bolt circle diameters, providing structural rigidity and ease of bolting.

  • Operating Limits
    Dependent on the o-ring material used:
    – Temperature range: ~0 °C to 120–180 °C
    – Vacuum range: From atmosphere down to ~10⁻⁷ torr (mbar)

Applications:

  • Chamber access flanges in HV research systems

  • Pump and instrumentation interface ports

  • Modular vacuum pipelines with ASA-standard terminations

  • Systems requiring precise rotational alignment of bolt patterns

  • Adapter flanges for ASA-to-ISO or ASA-to-CF transitions

TFM also supplies flat ASA flanges, o-rings (FKM, Buna-N), bolt kits, and ASA nipples, crosses, and tees, enabling complete high-vacuum system builds based on the ASA interface standard.

In summary, ASA HV Flanges – Rotatable Grooved provide vacuum engineers with a durable, alignment-friendly, and leak-tight sealing option for high-vacuum connections. Their ASA heritage and rotatable design make them a staple in many industrial and scientific vacuum assemblies.

Ordering Table

Flange Size/OD Type Flange Material Drawing Bore Bolt Hole Dia. # of Bolt Holes Note Dim A Dim B Dim C Dim D Dim E Dim F Part Number
ASA 6 (11.00" OD) Rotatable Grooved 304L SS Tooltip Blank 0.81 8 — 11 0.75 Blank — — 9.5 ASA1100X00GR
ASA 6 (11.00" OD) Rotatable Grooved 304L SS Tooltip 6.02 0.81 8 — 11 0.75 6.02 5.92 0.38 9.5 ASA1100X60GR
ASA 6 (11.00" OD) Rotatable Grooved 304L SS Tooltip 8.02 0.81 8 — 11 0.75 8.02 7.88 0.38 9.5 ASA1100X80GR
ASA 8 (13.50" OD) Rotatable Grooved 304L SS Tooltip Blank 0.81 8 — 13.5 0.75 Blank — — 11.75 ASA1350X00GR
ASA 8 (13.50" OD) Rotatable Grooved 304L SS Tooltip 10.02 0.81 8 — 13.5 0.75 10.02 9.88 0.38 11.75 ASA1350X10GR
ASA 8 (13.50" OD) Rotatable Grooved 304L SS Tooltip 8.02 0.81 8 — 13.5 0.75 8.02 7.88 0.38 11.75 ASA1350X80GR
ASA 10 (16.00" OD) Rotatable Grooved 304L SS Tooltip Blank 0.81 12 16 0.75 Blank — — 14.25 ASA1600X00GR
ASA 10 (16.00" OD) Rotatable Grooved 304L SS Tooltip 10.02 0.81 12 — 16 0.75 10.02 9.88 0.38 14.25 ASA1600X10GR
ASA 10 (16.00" OD) Rotatable Grooved 304L SS Tooltip 12.02 0.81 12 — 16 0.75 12.02 11.88 0.38 14.25 ASA1600X12GR
ASA 1 (4.25" OD) Rotatable Grooved 304L SS Tooltip Blank 0.63 4 — 4.25 0.5 Blank — — 3.13 ASA425X00GR
ASA 1 (4.25" OD) Rotatable Grooved 304L SS Tooltip 1.01 0.63 4 — 4.25 0.5 1.01 0.94 0.25 3.13 ASA425X10GR
ASA 1 (4.25" OD) Rotatable Grooved 304L SS Tooltip 1.51 0.63 4 — 4.25 0.5 1.51 1.44 0.25 3.13 ASA425X15GR
ASA 1.5 (5.00" OD) Rotatable Grooved 304L SS Tooltip Blank 0.63 4 — 5 0.5 Blank — — 3.88 ASA500X00GR
ASA 1.5 (5.00" OD) Rotatable Grooved 304L SS Tooltip 1.51 0.63 4 — 5 0.5 1.51 1.44 0.25 3.88 ASA500X15GR
ASA 1.5 (5.00" OD) Rotatable Grooved 304L SS Tooltip 2.01 0.63 4 — 5 0.5 2.01 1.94 0.25 3.88 ASA500X20GR
ASA 1.5 (5.00" OD) Rotatable Grooved 304L SS Tooltip 2.51 0.63 4 — 5 0.5 2.51 2.44 0.25 3.88 ASA500X25GR
ASA 2 (6.00" OD) Rotatable Grooved 304L SS Tooltip Blank 0.75 4 — 6 0.5 Blank — — 4.75 ASA600X00GR
ASA 2 (6.00" OD) Rotatable Grooved 304L SS Tooltip 2.01 0.75 4 — 6 0.5 2.01 1.94 0.25 4.75 ASA600X20GR
ASA 2 (6.00" OD) Rotatable Grooved 304L SS Tooltip 2.51 0.75 4 — 6 0.5 2.51 2.44 0.25 4.75 ASA600X25GR
ASA 2 (6.00" OD) Rotatable Grooved 304L SS Tooltip 3.01 0.75 4 — 6 0.5 3.01 2.94 0.25 4.75 ASA600X30GR
ASA 2 (6.00" OD) Rotatable Grooved 304L SS Tooltip 3.51 0.75 4 — 6 0.5 3.51 3.44 0.25 4.75 ASA600X35GR
ASA 3 (7.50" OD) Rotatable Grooved 304L SS Tooltip Blank 0.75 4 — 7.5 0.5 Blank — — 6 ASA750X00GR
ASA 3 (7.50" OD) Rotatable Grooved 304L SS Tooltip 3.01 0.75 4 — 7.5 0.5 3.01 2.94 0.25 6 ASA750X30GR
ASA 3 (7.50" OD) Rotatable Grooved 304L SS Tooltip 3.51 0.75 4 — 7.5 0.5 3.51 3.44 0.25 6 ASA750X35GR
ASA 3 (7.50" OD) Rotatable Grooved 304L SS Tooltip 4.01 0.75 4 — 7.5 0.5 4.01 3.92 0.25 6 ASA750X40GR
ASA 4 (9.00" OD) Rotatable Grooved 304L SS Tooltip Blank 0.75 8 — 9 0.5 Blank — — 7.5 ASA900X00GR
ASA 4 (9.00" OD) Rotatable Grooved 304L SS Tooltip 4.01 0.75 8 — 9 0.5 4.01 3.92 0.25 7.5 ASA900X40GR
ASA 4 (9.00" OD) Rotatable Grooved 304L SS Tooltip 6.02 0.75 8 — 9 0.5 6.02 5.92 0.25 7.5 ASA900X60GR

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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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