VacuTight™ fittings

For airtight connections at reduced pressure

VacuTight™ Fittings are designed to provide airtight, dependable connections under vacuum and low pressure conditions. Many of the VacuTight™ nuts have streamlined profiles for use in systems requiring a large number of connections in a small area. Furthermore, the VacuTight™ ferrule’s small size ensures sufficient nut/thread engagement, even in shallow ports. These features make VacuTight™ Fittings ideal for combinatorial chemistry, high throughput screening, clinical diagnostic, and other automated liquid handling applications.

The configuration of the VacuTight™ flat-bottom ferrules prevents over-compression and tubing ID reduction that can occur with many coned fittings. The result is more consistent aspirating and dispensing volumes across all system connections. The VacuTight™ fittings can also work well in some positive pressure applications. The pressure range for each fitting is listed below and depends upon the tubing used for the connection.

  • For 1/16” & 1/8″ OD tubing connections into 1/4-28 & 10-32 flat-bottom ports
  • Vacuum rated to 25 in-Hg (84 kPa)
  • Improve transfer volume consistency

Product details

Part No.*DescriptionPortPressure RatingHead StyleMaterial
P-844VacuTight Fitting for 1/16” OD Tubing, Short10-32 Flat-Bottom400–800 psi (27–55 bar)Headless KnurlPEEK Red
P-948VacuTight Fitting for 1/8” OD Tubing1/4-28 Flat-Bottom500–1,000 psi (34–69 bar)Standard KnurlPEEK Natural
P-840VacuTight Ferrule for 1/16” OD Tubing10-32 or 1/4-28 Flat-Bottom400–800 psi (27–55 bar)-ETFE Red
P-940VacuTight Ferrule for 1/8” OD TubingM6x1 or 1/4-28 Flat-Bottom500–1,000 psi (34–69 bar)-ETFE Red


Consult the Periodic Table of Analytical Fittings for a quick overview, the Fittings 101 for guidance and learning, and the IDEX Catalogue for product details, or contact Biotech Fluidics for expert advice.

Periodic table of
analytical fittings

Fittings 101
guide booklet

Complete IDEX

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