For higher pressure and temperature applications where a Flangeless connection is desired, consider the Flangeless SealTight™ Fitting System

The ferrule is manufactured from PEEK™ polymer, and when coupled with an appropriate nut, the system can be used in applications up to 5,000 psi (345 bar). FlushNut™ Fittings are designed for tight-space applications where nut heads often interfere with each other. When coupled with and appropriate ferrule and tightened into a receiving port, the FlushNuts slotted head seats at or near flush with the top of the port allowing the fitting to reside in closer proximity than any other option on the market. All FlushNut Fittings are manufactured from 316-stainless steel, except the P-321 Plug, which is made of PEEK™ polymer. (To tighten these fittings appropriately, use either the F-345 FlushNut wrench for 10-32 threaded fittings or the F-346 FlushNut wrench for 1/4-28 threaded fittings.)

Flangeless Fittings for 1/16 in (1.6 mm) OD tubing are excellent replacements for flanged fittings. They are dependable, easy to use, and easy to replace – just slip the nut and ferrule over the tubing and finger tighten the assembly into your receiving port. In tests, it is shown that the ideal amount of torque to achieve expected part performance should be approximately 3-4 in-lbs (0.34 – 0.45 Nm). Part numbers that begin with the letter "X" indicate fittings and ferrules that are packaged together for easy ordering, and are available in a wide variety of materials and geometries to fit most applications.

Designed for 1/16” or 1/8” OD tubing, Flanged Fittings are supplied with nut and 3/16 stainless steel washer and are compatible with most standard ¼-28 or M6 flat-bottom ports. The hard, inert Delrin® (acetal resin) nut resists cross threading or loosening during use, while the ETFE nuts work well in chemically aggressive environments. Multiple head styles and materials available. Super Flangeless™ Fitting Systems are quickly becoming the standard for instrumentation, displacing many flanged tube assemblies. Once swaged, the fitting system, unlike flanged tubing, can withstand several retightening cycles with no change in performance or damage to the tubing. The Super Flangeless fitting system includes a two-piece ferrule with a lock ring that operates as a bearing against the nut. This allows the nut to spin freely, which prevents the tubing from twisting during the tightening process eliminating subsequent loosening of the nut making the Super Flangeless fittings ideal for applications subject to vibration. The Super Flangeless fitting is also perfect for applications where connections need to be broken frequently because the lock ring holds the ferrule in place on the tubing until it is intentionally removed.

Upchurch Scientific® TinyTight™ Fittings are easy to use alternatives for Lee Company 062 MINSTAC® fitting systems. These fittings consist of a TinyTight Ferrule that works with a 6-40 threaded nut (part number M-644-03) and either a 0.020” (0.50 mm) or 0.03” (0.75 mm) thru-hole ferrules. Simply slide a fitting head first onto your tubing followed by the ring and ferrule. Thread this assembly into the solenoid valve receiving port; no collets, colleting tools, or chamfering tools required. Large Bore Fittings are designed for use with 5/16-24 or 1/2-20 thread port configurations and can be used with 1/16”, 1/8”, 3/16”, 1/4”, 5/16”, 3.0 mm, or 4.0 mm OD tubing, depending on the fitting combination used. Standard Flangeless Ferrules are designed to connect 1/16" and 1/8" OD tubing to flat-bottom ports when paired with the appropriate M6, ¼-28 or 5/16-24 Flangeless Nuts.

VacuTight™ Fittings are designed to connect 1/16” or 1/8” OD tubing to 10-32, 1/4-28, or M6 flat bottom ports. VacuTight fittings provide airtight, dependable connections under vacuum and low pressure conditions. Many of the VacuTight Nuts have streamlined profiles for use in systems requiring a large number of connections in a small area. The small size ensures sufficient nut/thread engagement, even in shallow ports, which makes the VacuTight ideal for “combichem” high throughput screening, clinical diagnostics, and other automated liquid handling applications. VacuTight flat bottom ferrules prevent over compression and tubing ID reduction that can occur with many coned fittings – the result – more consistent aspirating and dispensing volumes across all system connections. All VacuTight Nuts must be used exclusively with VacuTight Ferrules.