Two-Piece RheFlex® Fingertight Fittings - Nuts and Ferrules

For Coned Ports

Two-Piece Fingertight Fittings feature a separate ferrule. With a two-piece design, you can replace just the ferrule instead of the entire unit, making these Fingertights more economical than the one-piece version.

The Rheodyne® RheFlex Precision Two-Piece PEEK™ Fittings sets provide inert, biocompatible connections for instrumentation. These dependable 1/16" PEEK fittings have a reliable, time-tested design. Each 1/16" fittings set contains a 10-32 threaded nut and a specially-designed PEEK ferrule. Three lengths of the 1/16" nut are available: Standard, Short, and Extra Long. RheFlex Fingertight Fittings are rated for use up to 7000 psi.

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.

Two-Piece Fittings with Polymer Ferrules

  1. Slide the nut, followed by the ferrule, 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 ferrule should be replaced.
The nuts can be ordered separately - please contact us for pricing.

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Item #

Item Name

Tubing Outside Diameter

Units Per Package

Thread Size

List Price

6511

Male Nut Black Teflon 1/16 1/4-28 w/SS Washer.5/Pk

41655 in

5

46756

$7.58
6512

1/4in BLUE SEPTA 100/PK MAOT 250 C

41655 in

5

46756

$46.75
6513

Male Nut White Teflon 1/16 1/4-28 w/SS Washer. 5/Pk

41655 in

5

46756

$7.58
6514

3/8in BLUE SEPTA 100/PK MAOT= 250 C

41655 in

5

46756

$46.75
6515

Male Nut Green Teflon 1/16 1/4-28 w/SS Washer. 5/Pk

41655 in

5

46756

$121.34
6516

Male Nut Blue Teflon 1/16 1/4-28 w/SS Washer. 5/Pk

41655 in

5

46756

$7.58
6518

7/16in BLUE SEPTA 100/PK MAOT 250 C

41655 in

5

46756

$71.41
6521

Male Nut Black Teflon 1/8 1/4-28 w/SS Washers Pk/5

41647 in

5

46756

$7.63
6522

Male Nut Red Teflon1/8 1/4-28 w/ SS Washers 5 Pack.

41647 in

5

46756

$7.63
6523

Male Nut White Teflon 1/8 1/4-28 w/ SS washers 5 Pack.

41647 in

5

46756

$7.63
6524

Male Nut Yellow Teflon 1/8 1/4-28 w/ SS Washers 5 Pack.

41647 in

5

46756

$7.63
6526

Male Nut Blue Teflon 1/8 1/4-28 w/ SS Washers 5pack.

41647 in

5

46756

$96.18
6527

Male Nut Natural Teflon 1/8 1/4-28 w/ SS Washers 5 Pack

41647 in

5

46756

$8.24
6000-274GN

Fittings PK 1/8 TF GN 10/PK

41647 in

10

N/A

$59.30
6000-274RD

Rhe-Flex Red Twist-Free Fittings Set PEEK 1/8 10 Pack.

41647 in

10

N/A

$60.32
6000-274YL

Rhe-Flex Yellow Twist-Free Fittings Set PEEK 1/8 10 Pack.

41647 in

10

N/A

$60.32
6000-276BL

RheFlex Blue Twist-Free Fittings Set PEEK 1/16 10/PK

41655 in

10

N/A

$60.32
6000-276GN

RheFlex Green Twist-Free Fittings Set PEEK 1/16 10/PK

41655 in

10

N/A

$60.32
6000-276GY

RheFlex Grey Twist-Free Fittings Ser PEEK 1/16 10/PK

41655 in

10

N/A

$60.32
6000-276RD

RheFlex Red Twist-Free Fittings Set PEEK 1/16 10Pk

41655 in

10

N/A

$60.32
6000-276WH

RheFlex White Twist-Free Fittings Set PEEK 1/16 10/PK

41655 in

10

N/A

$60.32
6000-276YL

RheFlex Yellow Twist-Free Fittings Set PEEK 1/16 10/PK

41655 in

10

N/A

$60.32
6000-278RD

RheFlex Flangeless Fittings Set PEEK 1/8 Red 10/Pk

41647 in

10

N/A

$38.11
6000-280GN

RheFlex Flangeless Fittings Set PEEK/Tefzel 1/16 Green 10/Pk

41655 in

10

N/A

$40.88
6000-280GY

Fittings PK 1/16 FL GY 10/PK

41655 in

10

N/A

$67.68