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ASA Flanges–Fixed Grooved

ASA flanges, adapted decades ago from 150# steam-pipe flanges, are simple, sexed vacuum seals—one flange is grooved to accept an o-ring while the mating flange is smooth.

ASA flanges are limited (by the o-ring's properties) to applications with temperatures between ~0° C and 120-180° C and pressure from atmosphere to ~10-7 torr or mbar. These flanges are sized by the connecting pipe's nominal I.D. in inches. The normal range is: 1", 1.5", 2", 3", 4", 6", 8", and 10". They have large diameter bolt holes through the rim; consequently, for any given tube diameter, ASA flanges have much larger O.D.s than other flange types.

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To contact someone directly, please click here, or call +1 412 387 9200 to get in contact with your dedicated sales team.
Note:
  • When buying ASA flanged fittings and components, always compare dimensions carefully. When purchasing flanges to mate to an existing item, have that item's flange O.D., I.D., number of bolt holes, bolt circle diameter, and the handy o-ring groove I.D. for quick reference.

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Ordering Table

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Flange Selection Guide
With a variety of flanges to choose from, the Flange Selection Guide is designed to help you find one to meet your vacuum requirements. Shop Now!
Can't find the flange you need or want a custom configuration? Please call us at +1 412 387 9200 or email international@lesker.com with your inquiry.

Accessories Table

Description For Per Package
VacuCADSM
Part Number Price In Stock Add Item
Description For Per Package
VacuCADSM
Part Number Price In Stock Add Item
O-Rings (Fluorocarbon) Size 1 ASA Flanges 1
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O-V223
$19.50 In Stock
O-Rings (Fluorocarbon) Size 1.5 ASA Flanges 1
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O-V230
$21.35 In Stock
O-Rings (Fluorocarbon) Size 2 ASA Flanges 1
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O-V238
$21.00 In Stock
O-Rings (Fluorocarbon) Size 3 ASA Flanges 1
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O-V247
$21.00 In Stock
O-Rings (Fluorocarbon) Size 4 ASA Flanges 1
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O-V258
$34.20 In Stock
O-Rings (Fluorocarbon) Size 6 ASA Flanges 1
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O-V266
$23.85 In Stock
O-Rings (Fluorocarbon) Size 8 ASA Flanges 1
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O-V274
$21.85 In Stock
O-Rings (Fluorocarbon) Size 10 ASA Flanges 1
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O-V278
$24.95 In Stock
Bolt Sets, 9/16—12 x 1.50" Size 1 ASA & 1.5 ASA Flanges 4
N/A
HBS563121504
P.O.R. In Stock
Bolt Sets, 5/8—11 x 1.75" Size 2 ASA & 3 ASA Flanges 4
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HBS625111754
$16.10 In Stock
Bolt Sets, 5/8—11 x 1.75" Size 4 ASA Flanges 8
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HBS625111758
$30.05 In Stock
Bolt Sets, 3/4—10 x 2.50" Size 6 ASA & 8 ASA Flanges 8
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HBS751025008
$47.25 Contact KJLC for Availability
Bolt Sets, 3/4—10 x 2.50" Size 10 ASA Flanges 12
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HBS751025012
$70.35 Contact KJLC for Availability
How to Combine Click the checkboxes of the parts you would like to purchase and then click the button below to add all parts selected into your Cart.
Contact Us - ASA Flanges–Fixed Grooved