One-Piece Fingertight Fittings

For Coned Ports

Upchurch Scientific®'s original One-Piece Fingertight Fittings have 10-32 threads and are designed to be used with 1/16" OD tubing, except the M-645 (6-40, 1/32") and P-100 (1/4-28, 1/8").

The F-120 is Upchurch Scientific's most popular high pressure Fingertight. (Upchurch Scientific also manufactures two-piece Fingertight fittings with overall geometries similar to the F-120 - the F-195 SealTight™ fitting and the F-331 Fingertight are available.)

Our M-645 Fitting is a direct replacement for the 6-40 threaded VICI® (Valco) fitting.

Upchurch Scientific One-Piece Fingertight Fittings are rated between 1000-6000 psi (69-414 bar), depending on the fitting.

RheFlex® One-Piece Fittings are designed for use with many of the Rheodyne® manual valves. The One-Piece RheFlex M4 Fittings, designed for use with Rheodyne MX Nano-Scale Modules. For One-Piece Fingertight Fittings for Ultra High Performance valves.

Installing High Pressure Fittings

Before connecting fittings, ensure the end of the tubing has a clean, square, burr-free cut. This is very important, as the square cut helps the tubing make full contact with the bottom of the mating port. Neglecting to properly cut the tubing could lead to dead volume, resulting in peak distortion such as fronting, tailing or broadening.

Polymer One-Piece Fittings

  1. Slide the fitting at least 3/16” from the end of the clean cut tubing.
  2. Insert the assembly into the receiving port, pushing the tubing into the port until it bottoms out.
  3. Finger tighten the nut into the port until snug.(Upchurch Scientific® recommends a tightening torque of 2-4 in-lbs for its Fingertight fittings - roughly equivalent to typical finger tightening torque. Please note that undertightening can result in fitting leakage at pressures less than to what the fitting is rated, and overtightening can cause leakage and/or fitting damage.)
  4. After several uses (especially at high pressures) the fitting should be replaced.

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