BioTight™ fittings

New biocompatible fitting system for small spaces

The newly introduced IDEX BioTight™ fitting system provides consistent biocompatible performance in low-pressure 1/4-28 flat-bottom port assemblies up to 200 psi (14 bar). These fittings are ideal for small spaces and require very little torque thanks to the metal-free press-fit ferrules that are available for 1/16” & 1/8” tubing OD. One universal PEEK nut accommodates all tubing diameters.


  1. Slide the fitting onto your tubing and add the black-coloured lock ring, ensuring the ridge feature faces the fitting for 1/8-inch tubing.
  2. Slide the ferrule tube onto your tubing.
  3. Place the components into your intended port, inserting the port thread into the fitting while keeping pressure on the tube.
  4. Tighten the nut. Continue until you feel the lock ring bottom-out in the port. It’s that simple.

Product details

Part No.*DescriptionPortPressure RatingHeadstyleMaterial
LP-336BioTight™ Universal Fitting1/4-28 Flat Bottom**Headless KnurlPEEK
LP-062BioTight™ Ferrule Assembly 1/16"1/4-28 Flat Bottom200 psi (14 bar)-PEEK
LP-125BioTight™ Ferrule Assembly 1/8"1/4-28 Flat Bottom100 psi (7 bar)-PEEK


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

Any questions?

If you have any inquiries about our products and services, we’re here to help.

Phone: +46 300 56 91 80