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ASA HV Flanges – Rotatable Grooved

ASA HV Flanges–Rotatable Flat

ASA HV Flanges – Rotatable Flat: Precision-Mated Vacuum Interfaces with Rotational Flexibility

ASA HV Flanges – Rotatable Flat, designed and fabricated by TFM, are engineered for use in high-vacuum (HV) systems that demand robust, modular sealing interfaces. Derived from the long-established 150# steam-pipe flange standard, ASA flanges feature a sexed sealing system, with flat flanges intended to mate against grooved flanges containing o-rings. This configuration offers a clean, reliable vacuum seal via elastomeric compression.

What distinguishes the rotatable flat version is the flange’s ability to rotate freely around its hub, greatly simplifying installation by allowing precise bolt hole alignment without repositioning welded components. These flanges are crafted from 304L stainless steel, making them ideal for demanding environments that require both chemical resistance and high structural integrity.

Key Features of ASA HV Flanges – Rotatable Flat:

  • Smooth Vacuum-Sealing Surface
    Designed to mate with a grooved ASA flange containing an o-ring, forming a secure, leak-tight joint.

  • Rotatable Alignment Capability
    Enables easy adjustment of bolt hole orientation without rotating the entire component—perfect for tight or asymmetrical assembly conditions.

  • 304L Stainless Steel Construction
    Offers high strength, excellent weldability, and corrosion resistance, making these flanges suitable for cleanroom, research, and industrial applications.

  • Sized by Nominal Pipe I.D.
    ASA flanges are dimensioned by the pipe’s nominal inner diameter, with standard sizes including:
    1″, 1.5″, 2″, 3″, 4″, 6″, 8″, and 10″

  • Large Outer Diameter with Bolt Circle
    ASA flanges feature oversized bolt holes arranged around a wide rim, delivering strong mechanical connections and structural durability.

  • Operating Conditions
    – Temperature Range: 0°C to 120–180°C (based on o-ring material)
    – Pressure Capability: From atmosphere to ~10⁻⁷ torr or mbar

Applications:

  • High-vacuum chamber ports requiring bolt pattern flexibility

  • Vacuum system modules that demand field alignment or repositioning

  • Process tool connections in semiconductor and materials R&D

  • Adapter interfaces between static hardware and removable chamber lids

  • Retrofitted systems requiring reliable flat sealing surfaces with modularity

TFM also supplies rotatable grooved flanges, fixed grooved and flat flanges, ASA flange o-rings, and bolt ring assemblies, enabling complete ASA-standard vacuum system construction and maintenance.

In conclusion, ASA HV Flanges – Rotatable Flat provide a versatile, durable, and alignment-friendly sealing solution for vacuum systems utilizing sexed ASA flange architecture. Their rotatable design allows for quick, error-free assembly even in complex setups, making them an essential tool in any HV engineer’s toolkit.

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 Flat 304L SS Tooltip Blank 0.81 8 — 11 0.75 Blank — — 9.5 ASA1100X00R
ASA 6 (11.00" OD) Rotatable Flat 304L SS Tooltip 6.02 0.81 8 — 11 0.75 6.02 5.92 0.38 9.5 ASA1100X60R
ASA 6 (11.00" OD) Rotatable Flat 304L SS Tooltip 8.02 0.81 8 — 11 0.75 8.02 7.88 0.38 9.5 ASA1100X80R
ASA 8 (13.50" OD) Rotatable Flat 304L SS Tooltip Blank 0.81 8 — 13.5 0.75 Blank — — 11.75 ASA1350X00R
ASA 8 (13.50" OD) Rotatable Flat 304L SS Tooltip 10.02 0.81 8 — 13.5 0.75 10.02 9.88 0.38 11.75 ASA1350X10R
ASA 8 (13.50" OD) Rotatable Flat 304L SS Tooltip 8.02 0.81 8 — 13.5 0.75 8.02 7.88 0.38 11.75 ASA1350X80R
ASA 10 (16.00" OD) Rotatable Flat 304L SS Tooltip Blank 0.81 12 — 16 0.75 Blank — — 14.25 ASA1600X00R
ASA 10 (16.00" OD) Rotatable Flat 304L SS Tooltip 10.02 0.81 12 — 16 0.75 10.02 9.88 0.38 14.25 ASA1600X10R
ASA 10 (16.00" OD) Rotatable Flat 304L SS Tooltip 12.02 0.81 12 — 16 0.75 12.02 11.88 0.38 14.25 ASA1600X12R
ASA 1 (4.25" OD) Rotatable Flat 304L SS Tooltip Blank 0.63 4 — 4.25 0.5 Blank — — 3.13 ASA425X00R
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 ASA425X10R
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 ASA425X15R
ASA 1.5 (5.00" OD) Rotatable Flat 304L SS Tooltip Blank 0.63 4 — 5 0.5 Blank — — 3.88 ASA500X00R
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 ASA500X15R
ASA 1.5 (5.00" OD) Rotatable Flat 304L SS Tooltip 2.01 0.63 4 — 5 0.5 2.01 1.94 0.25 3.88 ASA500X20R
ASA 1.5 (5.00" OD) Rotatable Flat 304L SS Tooltip 2.51 0.63 4 — 5 0.5 2.51 2.44 0.25 3.88 ASA500X25R
ASA 2 (6.00" OD) Rotatable Flat 304L SS Tooltip Blank 0.75 4 — 6 0.5 Blank — — 4.75 ASA600X00R
ASA 2 (6.00" OD) Rotatable Flat 304L SS Tooltip 2.01 0.75 4 6 0.5 2.01 1.94 0.25 4.75 ASA600X20R
ASA 2 (6.00" OD) Rotatable Flat 304L SS Tooltip 2.51 0.75 4 — 6 0.5 2.51 2.44 0.25 4.75 ASA600X25R
ASA 2 (6.00" OD) Rotatable Flat 304L SS Tooltip 3.01 0.75 4 — 6 0.5 3.01 2.94 0.25 4.75 ASA600X30R
ASA 2 (6.00" OD) Rotatable Flat 304L SS Tooltip 3.51 0.75 4 — 6 0.5 3.51 3.44 0.25 4.75 ASA600X35R
ASA 3 (7.50" OD) Rotatable Flat 304L SS Tooltip Blank 0.75 4 — 7.5 0.5 Blank — — 6 ASA750X00R
ASA 3 (7.50" OD) Rotatable Flat 304L SS Tooltip 3.01 0.75 4 — 7.5 0.5 3.01 2.94 0.25 6 ASA750X30R
ASA 3 (7.50" OD) Rotatable Flat 304L SS Tooltip 3.51 0.75 4 — 7.5 0.5 3.51 3.44 0.25 6 ASA750X35R
ASA 3 (7.50" OD) Rotatable Flat 304L SS Tooltip 4.01 0.75 4 — 7.5 0.5 4.01 3.92 0.25 6 ASA750X40R
ASA 4 (9.00" OD) Rotatable Flat 304L SS Tooltip Blank 0.75 8 — 9 0.5 Blank — — 7.5 ASA900X00R
ASA 4 (9.00" OD) Rotatable Flat 304L SS Tooltip 4.01 0.75 8 — 9 0.5 4.01 3.92 0.25 7.5 ASA900X40R
ASA 4 (9.00" OD) Rotatable Flat 304L SS Tooltip 6.02 0.75 8 — 9 0.5 6.02 5.92 0.25 7.5 ASA900X60R

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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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