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Pressure and Vacuum Feedthroughs

Series PF - Feedthroughs for single elements

These feedthroughs are designed for sealing single elements, usually sensors, probes or tubes, where they penetrate a pressure or environmental boundary.

Common applications include sealing sheathed thermocouples and resistance thermometers, small-bore tubes and other types of sensor where they enter a process enclosure.

Series PF feedthroughs seal elements from 0.5mm dia. to 19.05mm (3/4”). There are five body sizes having 1/16”, 1/8”, 1/4”, 1/2” and 3/4” process connections with BSPT (conical gas or DIN 2999 ‘R’) and NPT threads.

Spectite® feedthroughs are designed for ease of assembly and installation. Elements can be adjusted, removed and replaced when not under pressure or vacuum conditions.
  • Seal on probes, sensors, small-bore tubes and other similar elements
  • Immersion length of the element can be easily adjusted
  • Five sizes of feedthrough assembly
  • Designed for easy installation of single elements 0.5mm to 19.05mm (3/4”) diameter
  • Pressure range: Vacuum to 700 bar*
  • Temperature range: <-200°C to +870°C*
  • Stainless steel body (316L), internal metal components and cap
  • Choice of five sealant materials
  • Reusable fitting – internal components replaceable
  • A large range of feedthroughs is available to buy online

    * Dependent on sealant and fitting selected

Enquiry Form

1. Thread Size Required

  see table

2. Element diameter

 see table

3. Sealant Type

 see table

4. Quantity Required

Contact Details

Company Name

Your Name




Additional Information

If your enquiry is for more than one style of sensor, please email us with your requirements or use the box below

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We will only use your email address to contact you. We will never give your email address to 3rd parties and we do not sell data on to any other company. We prefer to concentrate on making quality temperature related products.

3 Sealant
Example Operating
Temperature Range
Material definition and properties
G Graftite™ -200°C to +550°C
(to +870°C in a
reducing atmosphere)
Graphite 98% purity. Impermeable to gases and liquids.
Resistant to most media, not 'wetted' by molten metals or salts. Asbestos-free.
No ageing or embrittlement. Good resistance to thermal shock. Not re-usable.
N Neoprene -40°C to +90°C Synthetic rubber based on polychloroprene.
The elastic properties of the polymer are enhanced by vulcanization.
It is much more resistant to heat, light, oxidation, and petroleum than
ordinary rubber. Re-usable.
L Lava -200°C to +870°C Natural Magnesium Silicate (Soapstone, Steatite or Rock Talc).
Crushes to a powder when compressed.
Porous to light gases and moisture. Hygroscopic.
Not suitable for most vacuum applications. Not re-usable.
T PTFE -200°C to +250°C Polytetrafluoroethylene. FDA approved grade to Title 21 -CFR 17. 1550 and is
approved to US Pharmacopoeia Class VI . Has smooth, non-wetting, hydrophobic surfaces
that resist biofilm buildup and the lowest coefficient of friction of any solid material.
Low thermal transfer. Re-usable.
V Viton® -40°C to +225°C
(intermittently to +285°C)
Fluoroelastomer. Resists hydrocarbons, corrosive chemicals and petroleum.
Solvent, acid and base resistant.
Low permeation rate. Mechanically robust at high temperatures. Re-usable.
  Other sealant materials may be specified, usually for the individual special requirements of particular applications.
Please contact TC Ltd. for assistance.