How To Order - Basic Part Numbers, End Plate Styles, High Vacuum Flange Assemblies

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Standard Bellows offers a large selection of stock bellows assemblies to meet a variety of design needs. Over thirty-five diametrical sizes, multiple segments, five end plate styles, and high vacuum flanges can be assembled in numerous configurations, without the high cost and long lead time associated with custom assemblies. Standard Bellows has been a reliable supplier of high quality stock bellows for over 30 years.

Please contact our sales department for current delivery information.

Bellows convolutions are of Type 347 Stainless Steel. End fittings are of Type 304 or Type 347 Stainless Steel.

Stock bellows are ideal for high vacuum applications; vacuum internal to the bellows is preferred as vacuum external may cause squirm instability. For designs requiring vacuum external or pressures greater than 2 ATM please consult with SBC's engineering staff.

Assemblies are 100% leak tested on helium mass spectrometer leak checking machines. All parts are certified to have a leak rate of less than 2 x 10^-9 Std. cc/Sec. He.

Life is typically 5,000 - 10,000 cycles with a 1 ATM pressure differential at the stroke values listed. Part numbers 750-600 and larger have lower cycle lives. For higher cycle life requirements please contact SBC's engineering department as greatly improved performance can be obtained for specific applications.

PART NUMBER 37-12-2-DE

Basic Part Number 37-12 : .375 in. O.D. x .125 in. I.D.

Segment Number -2 : Stroke = .30 in. (2 Segments x .15 in./Segment)

End Plate Styles -DE : One "D" style closed end and one "E" style tube type end

PART NUMBER 189-139-4-II

Basic Part Number 189-139 : 1.890 in. O.D. x 1.390 in. I.D.

Segment Number -4 : Stroke = 2.28 in. (4 Segments x .57 in./Segment)

Flange Style Number - II : 2-3/4" in. high vacuum flanges with tapped bolt holes one rotatable, and one non-rotatable

Please feel free to contact Standard Bellows' engineering sales staff for additional information or to discuss a welded bellows application. This listing represents only a fraction of Standard Bellows manufacturing capabilities; the engineering department can provide solutions for nearly any welded bellows application.