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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
  • Feedthroughs offer non-continuous manual or motor-driven operation at speeds up to 500 rpm
  • 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

Manipulation and Motion FAQ
Click here for answers to some of the most common questions we get asked.
Contact Us
To speak with someone directly, please call 1-412-387-9200 or email international@lesker.com.

Ordering Table

Shaft Material PartNo Price Add To
Cart
Shaft Material PartNo Price Add To
Cart
1/4"
Aluminum
FMH-25A $210.00
1/4"
Stainless
FMH-25SS $380.00
3/8"
Aluminum
FMH-37A $280.00
3/8"
Stainless
FMH-37SS $435.00
1/2"
Aluminum
FMH-50A $280.00
1/2"
Stainless
FMH-50SS $475.00

Accessories Table

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

 

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