Flangeless™ fittings

Cost-efficient fittings that are easy to use

The IDEX Flangeless™ Fittings are easy to use, provide adequate sealing in many situations, and are available for several flat-bottom port designs and many different tubing outer diameters. These fittings eliminate the need to flanged tubing and are a cost-effective alternative due to their few components and quick replacement.

The Flangeless™ Fittings system has a wide selection of nuts for the popular 1/4-28 and M6x1 port designs, and some nuts are even provided in different colours. Nuts are also available for the narrower 10-32 flat-bottom ports, plus large bore versions for 5/16-24 and 1/2-20 port threads. The nuts come with different head designs to accommodate a variety of assembly situations, and are manufactured from either the polymeric materials Delrin (an acetal polymer also known as polyoxymethylene, POM), PEEK, ETFE, PPS, PFA, PP, or stainless steel.

The ferrules for the Flangeless™ Fittings system are made from ETFE and can accommodate an unmatched range of tubing outer diameters including 1/16”, 1/8”, 3/16”, 1/4”, and 5/16”, plus metric sizes 1.8, 2.0, 2.5, 3.0, and 4.0 mm. In addition, a special low-profile ferrule for 1/4-28 ports is also available for 1/16” and 1/8” OD tubing, which can be especially suitable for shallow receiving ports such as those used on some low-pressure valves.

The pressure rating depends on tubing diameter, port design, and type of ferrule used, and range from 250 psi (17 bar) up to 2500 psi (172 bar) for the Flangeless™ Fittings. In tests, it has been shown that the ideal amount of torque to achieve expected part performance should be approximately 3–4 in-lbs (0.34–0.45 N·m).

Consult the product guide table at the bottom of this page for an overview of which Flangeless™ nuts and ferrules match a certain tubing OD and port design.

Popular choices

Product details

Ferrules for 1/16″ & 1/8″ tubing

Part No.*DescriptionPortPressure RatingMaterial
P-200Flangeless Ferrule for 1/16” OD TubingM6 or 1/4-28 Flat-Bottom2,000 psi (138 bar)ETFE Blue
P-200NFlangeless Ferrule for 1/16” OD TubingM6 or 1/4-28 Flat-Bottom2,000 psi (138 bar)ETFE Natural
P-240Flangeless Ferrule for 1/16” OD Tubing, Small valveM6 or 1/4-28 Flat-Bottom2,500 psi (172 bar)ETFE Natural
P-300Flangeless Ferrule for 1/8” OD TubingM6 or 1/4-28 Flat-Bottom500 psi (34 bar)EFTE Yellow
P-300NFlangeless Ferrule for 1/8” OD TubingM6 or 1/4-28 Flat-Bottom500 psi (34 bar)ETFE Natural
P-340Flangeless Ferrule for 1/8” OD Tubing, Small valveM6 or 1/4-28 Flat-Bottom500 psi (34 bar)ETFE Natural

Ferrules for 1.8, 2.0, 2.5, 3.0, 4.0 mm tubing OD

Part No.*DescriptionPortPressure RatingMaterial
F-2521/16” OD Tubing Sleeve for 1.0 mm ID TubingM6 or 1/4-28 Flat-Bottom500 psi (34 bar)FEP Purple
P-342Flangeless Ferrule for 1.8 mm OD TubingM6 or 1/4-28 Flat-Bottom500 psi (34 bar)ETFE Green
P-363RFlangeless Ferrule for 2.0 mm OD TubingM6 or 1/4-28 Flat-Bottom500 psi (34 bar)ETFE Red
P-353Flangeless Ferrule for 2.5 mm OD TubingM6 or 1/4-28 Flat-Bottom500 psi (34 bar)ETFE Natural
P-343Flangeless Ferrule for 3.0 mm OD TubingM6 or 1/4-28 Flat-Bottom500 psi (34 bar)ETFE Orange
P-344Flangeless Ferrule for 4.0 mm OD Tubing5/16-24 Flat-Bottom250 psi (17 bar)ETFE Natural

Nuts for 1/4-28 ports

Part No.*DescriptionPortPressure RatingHead StyleMaterial
F-358Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**FlushNutSST
LT-111Flangeless Nut for 1/16” OD Tubing10-32 Flat Bottom**Standard KnurlPEEK Natural
P-201Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Standard KnurlDelrin Black
P-202Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Standard KnurlDelrin Red
P-218Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Standard KnurlETFE Natural
P-220Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Standard KnurlPP Natural
P-230Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Standard KnurlPEEK Natural
P-235Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Short Standard KnurlPEEK Natural
P-238Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Standard KnurlDelrin Purple
P-245Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Standard KnurlPFA Natural
P-286Flangeless Nut for 1/16” OD Tubing1/4-28 Flat Bottom**Headless KnurlPPS Natural
F-368Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**FlushNutSST
P-301Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**Standard KnurlDelrin Black
P-302Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**Standard KnurlDelrin Red
P-305Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**Standard KnurlDelrin Green
P-308Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**Short Standard KnurlDelrin Black
P-315Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**Standard KnurlETFE Natural
P-320Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**Standard KnurlPP Natural
P-330Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**Standard KnurlPEEK Natural
P-335Flangeless Fitting for 1/8” OD Tubing1/4-28 Flat Bottom**Short Standard KnurlPEEK Natural

Nuts for M6x1 ports

Part No.*DescriptionPortPressure RatingHead StyleMaterial
P-207Flangeless Nut for 1/16” OD TubingM6 Flat-Bottom**Standard KnurlDelrin Black
P-207SFlangeless Nut for 1/16” OD TubingM6 Flat-Bottom**Short Standard KnurlDelrin Black
P-247Flangeless Nut for 1/16” OD TubingM6 Flat-Bottom**Short Standard KnurlPEEK Black
P-307Flangeless Nut for 1.8 mm to 1/8” OD Tubing M6 Flat-Bottom**Standard KnurlDelrin Black
P-307SFlangeless Nut for 1.8 mm to 1/8” OD TubingM6 Flat-Bottom**Short Standard KnurlDelrin Black
P-347Flangeless Nut for 1.8 mm to 1/8” OD TubingM6 Flat-Bottom**Short Standard KnurlPEEK Black

Nuts and ferrules for 5/16-24 and 1/2-20 ports

Part No.*DescriptionPortPressure RatingHead StyleMaterial
P-136Flangeless Nut for 1/16” OD tubing5/16-24 Flat-Bottom**Standard KnurlPEEK Natural
P-130Flangeless Nut for 1/8” OD tubing5/16-24 Flat-Bottom**Standard KnurlPEEK Natural
P-132Flangeless Nut for 3/16” OD tubing5/16-24 Flat-Bottom**Standard KnurlPEEK Natural
U-655Flangeless Nut for 1/4” OD tubing1/2-20 Flat-Bottom**Large KnurlPEEK Black
U-662Flangeless Nut for 5/16” OD tubing1/2-20 Flat-Bottom**Large KnurlPEEK Black
P-133Flangeless Ferrule for 3/16” OD tubing5/16-24 Flat-Bottom500 psi (34 bar)-ETFE Blue
P-133NFlangeless Ferrule for 3/16” OD tubing5/16-24 Flat-Bottom500 psi (34 bar)-ETFE Natural
U-650Flangeless Ferrule for 1/4” OD tubing1/2-20 Flat-Bottom250 psi (17 bar)-ETFE Natural
U-660Flangeless Ferrule for 5/16” OD tubing1/2-20 Flat-Bottom250 psi (17 bar)-ETFE Natural

Product guide

Match Flangeless™ ferrule and nut with your tubing OD

Tubing ODFlat-bottom portFerrulesNuts
1/16"M6x1P-200, P-840P-207, P-207S, P-247, P-931
1/16"1/4-28P-200, P-840Any 1/4-28 nut for 1/16” OD tubing
1/16"5/16-24P-200P-136
1/8"M6x1P-300, P-940P-307, P-307S, P-347, P-945
1/8"1/4-28P-300, P-940Any 1/4-28 nut for 1/8” OD tubing
1/8"5/16-24P-300P-130
3/16"5/16-24P-133P-132
1/4"1/2-20U-650U-655
5/16"1/2-20U-660U-662
1.0 mmM6x1P-200*P-207, P-207S, P-247
1.0 mm1/4-28P-200*Any 1/4-28 nut for 1/16” OD tubing
1.8 mmM6x1P-242P-307, P-307S, P-347
1.8 mm1/4-28P-242Any 1/4-28 nut for 1/8” OD tubing
2.0 mmM6x1P-363RP-307, P-307S, P-347
2.0 mm1/4-28P-363RAny 1/4-28 nut for 1/8” OD tubing
2.5 mmM6x1P-353P-307, P-307S, P-347
2.5 mm1/4-28P-353Any 1/4-28 nut for 1/8” OD tubing
3.0 mmM6x1P-343P-307, P-307S, P-347
3.0 mm1/4-28P-343Any 1/4-28 nut for 1/8” OD tubing
4.0 mm5/16-24P-344P-132
*with F-252 sleeve, not included

Resources

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
catalogue

Any questions?

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Email: info@biotechfluidics.com