Series MF - Feedthroughs for multiple elements

Pressure and Vacuum Feedthroughs

A single access port into an enclosure or process vessel is all that is needed to allow multiple probes, sensors, etc., to pass through an environmental or pressure boundary using a single feedthrough assembly.

Series MF feedthroughs can seal multiple elements within a single assembly including typically up to 40 x 1.0mm dia., up to 12 x 3.0mm or up to 4 x 6.0mm elements. Please refer to the table for further details of feedthrough capacity and sizes of elements.

There are four body sizes having 1/8”, 1/4”, 1/2” and 3/4” process connections in either 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.
  • Saves time and costs by allowing multiple sensors to pass through one feedthrough fitting
  • Immersion length of each element can be easily adjusted
  • Four sizes of sealed feedthrough for probes, sensors, etc.
  • Designed for carrying multiple elements 0.5mm to 6.35mm diameter
  • Suitable for a mixture of sizes and types of elements
  • Pressure range: Vacuum to 700 bar*
  • Temperature range: <-200°C to +870°C*
  • 316L Body (and seat where applicable). Follower and cap in 303 or 304
  • Choice of five sealant materials
  • Reusable fitting – sealant and internal components replaceable
  • A large range of feedthroughs is available to buy online

    * Dependent on sealant and fitting selected

Body Size, Pressure Guide and available Bore Sizes for BSPT, BSPP and NPT Threads2

Body Size No. of
Size 1 (1/8")3 No. of
Size 2 (1/4") No. of
Size 3 (1/2") No. of
Size 4 (3/4")1 No. of
Size 5 (1")
Element Sizes (dia) The maximum guide pressure value (in bar) at 20°C is shown for each sealant material according to element size1.
These ratings are a guide and the suitability of any of the products described herein for a particular application
is entirely at the discretion of the purchaser as being the best judge for that particular application.
inches mm
0.020 0.5 2 to 4 400 400 250 250 250 4 to 8 300 400 250 250 250      
0.032 0.8
0.040 1.0 500 700 500 4 to 16 700 700 400 250 450 8 to 40 550 550 300 400
0.059 1.5   2 to 6 200 200 4 to 12 8 to 28 250
0.062 1.59
0.080 2.0
0.118 3.0 2 150 2 to 4 350 200 350 4 to 12 350 8 to 24 200 150 100 150
0.125 3.2
0.177 4.5   2 300 150 250 2 to 4 350 150 300 4 to 8 150 70 70 40
0.187 4.76   2 to 4
0.236 6.0 2 to 6
0.250 6.35
0.315 8.0   2 to 4 20
0.375 9.5
  1. The guide pressures shown for each type of sealant are at 20°C. Spectite® feedthroughs from TC Ltd. have been designed to provide an efficient seal on the elements and restrain them from moving under pressure and vacuum. It is good installation practice to provide additional, mechanical restraint to the elements when differential pressure exceeds 50% of the feedthrough guide pressure value at 20°C. With an increase in temperature, a reduction in the maximum guide pressure value can be expected. These ratings are a guide and the suitability of any of the products described herein for a particular application is entirely at the discretion of the purchaser as being the best judge for that particular application.
  2. Other types of process connection are available, see Feedthrough Sizes.
  3. The element diameters shown are the common sizes routinely demanded for general industrial applications. Other sizes can be supplied between the minimum and maximum diameters shown.

Pressure and Vacuum Feedthrough Enquiry Form

1. Thread Size Required
  see table
2. Element diameter
 see table
3. No. of Elements
 see table
4. Sealant Type

5. Quantity Required

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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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