IDEX coned port fittings

Variety of secure high-pressure connections

The IDEX coned port fittings are designed to seal efficiently also at the high pressures used in HPLC, ion chromatography, and related precision fluidic systems. The different fittings are made from stainless steel or polymeric materials to fit popular coned port geometries plus some of the less frequently used, while accommodating several standard tubing outer diameters and an extensive range of capillary dimensions.

The extensive product range includes both the popular one-piece fingertight PEEK fittings as well as more traditional stainless-steel constructions with separate nut and ferrule that require tools for tightening, plus several additional designs optimised for different purposes. Some of these fittings were previously known under the brands of Upchurch or Rheodyne, but are now united within the IDEX product program.

For the most extreme pressures in UHPLC, the VHP high-performance fitting series provides suitable options, as do the powerful fingertight MarvelXACT™ torque-limiting fitting system which auto-adjust to ensure efficient sealing with zero dead volume independently of port depth. In micro- and nanofluidic assemblies, the MicroTight® and NanoTight™ fitting systems, with the aid of a wide range of tubing sleeves, provide several options for connecting fused silica capillaries with outer diameters from 70 µm.

Biotech Fluidics maintains a considerable stock of many frequently requested fittings and connectors for speedy delivery. We are also happy to provide guidance to the most suitable solution for a particular flow path assembly situation. Please contact us for further discussions about your application.

Port geometries

6-40 coned
6-32 coned
10-32 coned
M4x0.7 coned
M6x1 coned
1/4-28 coned
5/16-24 coned

Popular choices

Coned port fitting systems

One-Piece Fingertight fittings

The original highly popular IDEX one-piece fingertight fitting design is convenient and easy to use while it also prevents ferrules from sticking in the receiving port. Available for 6-40, 10-32, or 1/4-28 coned ports, with tubing OD dimensions of 1/32”, 1/16”, or 1/8”. Pressure rated up to 5,000 psi (345 bar).

Stainless Steel fittings

Traditional two-piece 316 stainless-steel fittings for metal-based assemblies with coned 10-32, M6x1, 1/4-28, & 5/16-24 port designs for tubing OD of 1/16”, or 1/8”. Available in IDEX standard format, plus manufacturer-compatible designs, all rated to 20,000 psi (1,380 bar). Not recommended for plastic ports.

Two-Piece Fingertight fittings

Economical polymeric fitting with exchangeable ferrules in several materials for different circumstances, including a durable conductive polymer for electrospray mass spectrometry. Designed for 10-32 coned ports and tubing OD of 360 µm, 1/32” or 1/16”. Pressure rated up to 6,000 psi (414 bar).

SealTight™ Fingertight fittings

The SealTight™ fingertight fittings feature specially designed nuts and a polymeric dual compression ferrule that together allows sealing up 9,000 psi (620 bar). Constructed for connecting 1/16” OD tubing to 10-32 coned ports.

MicroTight® fittings

The MicroTight® family is a comprehensive system of fittings for connecting capillary tubing. Specifically made for 360 µm OD tubing, 1/32” OD tubing, or the MicroTight® tubing sleeves (0.025” OD). Designed for use with the NanoPort™ and MicroTight® unions, adapters and inline microfilters.

NanoTight™ fittings

The NanoTight™ fittings are designed to connect capillary tubing with OD from 70 µm to 1 mm into any standard 10-32 coned port using 1/16” OD tubing sleeves. These fittings can also be used to connect any 1/16” OD tubing.

Tubing sleeves for capillaries

IDEX manufacture a range of different tubing sleeves to ensure smooth, concentric, zero dead volume connection of capillary tubing into ports of different designs. Available with sleeve OD 0.025”, 1/32”, or 1/16” for 10-32, or 6-32 ports using different fitting types, including the MicroTight® and NanoTight™ acessories.

LiteTouch® fittings

The LiteTouch® fittings grip tubing at two compression points, and hold to high pressures with fingertight convenience. The design also prevents polymer tubing from twisting. LiteTouch® Fittings are available for 1/32”, 1/16”, or 1/8” OD tubing sizes, and for 10-32 or 1/4-28 coned ports, preferably in stainless-steel.

VHP High-performance fittings

The VHP high-performance fittings have been designed for extreme pressures up to 30,000 psi (2,070 bar). The polymeric VHP PK fittings are based on a proprietary PEEK blend to improve resistance to pressure and temperature (up to 200 °C). The PK polymer blend is available for several IDEX fitting systems including One-Piece Fingertight, LiteTouch®, and MicroTight®.

MarvelXACT™ UHPLC fitting

Tight with a click! Gives perfect fitting torque, with zero dead volume sealing every time, up to 1,300 bar (19,000 psi) routinely. Pre-fitted to flexible PEEK-lined stainless-steel tubing and reconnects up to 100 times. Ideal for UHPLC column connections and similar positions that frequently are exchanged by several different persons.


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