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Dynamic O-Ring Shaft Seal

Features

  • 1/4" shaft versions house two ball bearings that support the shaft of the o-ring seal for the smooth, low-torque operation usually found only in expensive motion feedthroughs
  • Bronze bushings support the shaft on the 3/8" and 1/2" shaft versions
  • A pre-loaded fluorocarbon o-ring seals the shaft, making over- or under-compression by inexperienced operators impossible
  • Seal allows dismantling in seconds and without tools, enabling operator to replace or re-grease the o-ring easily from the atmosphere side
  • Aluminum or stainless steel casings
  • Use barrel adapters to mate larger shaft diameters
  • Feedthrough uses a 1" baseplate fitting to mount to a standard 1" feedthrough port

NOTE: Vacuum seals for moving shafts are best run discontinuously and infrequently. Since the elastomers in o-ring seals are dynamic—rubber presses against a moving metal surface—they are susceptible to leaks and should be used for rough and high-vacuum conditions only.


Dimensional Drawings

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Ordering Table

Shaft Material Part Number Price In Stock Add To
Cart
Shaft Material Part Number Price In Stock Add To
Cart
1/4" Aluminum FMH-25A $210.00 Call for Availability
1/4" Stainless FMH-25SS $380.00 In Stock
3/8" Aluminum FMH-37A $280.00 In Stock
3/8" Stainless FMH-37SS $435.00 In Stock
1/2" Aluminum FMH-50A $280.00 In Stock
1/2" Stainless FMH-50SS $475.00 In Stock

Accessories Table

Description Shaft Size Part Number Price In Stock Add
To Cart
Description Shaft Size Part Number Price In Stock Add
To Cart
Replacement Bearing & Seal Package, 1/4" Shaft Drive
1/4"
FMH-25BK P.O.R. Call for Availability
Replacement Bearing & Seal Package, 3/8” Shaft Drive
3/8"
FMH-37BK P.O.R. Call for Availability
Replacement Bearing & Seal Package, 1/2" Shaft Drive
1/2"
FMH-50BK $55.00 Call for Availability
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