Micro and nano fittings

When working with capillary tubing (with an outer diameter of less than 1/16"), minimising dead volume is crucial. MicroTight® Fittings are specifically developed to provide a seamless and leak-free connection for microfluidics and capillary HPLC applications.

Unlike standard fittings, MicroTight systems often use a special gauge plug method or MicroTight Sleeves to secure very small diameter tubing (such as 360 µm) safely and accurately in a standard 10-32 port.

Unions, tees and adapters

Female nuts, ferrules and plugs

Tubing sleeves and kits

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The MicroTight® components

To make a perfect connection, the system usually consists of three parts:

MicroTight Nut: The nut that provides the pressure.
MicroTight Ferrule: The specific small ferrule that seals the tubing.
MicroTight Tubing Sleeve: A protective sleeve slid over the capillary tubing to increase the diameter to a size the ferrule can grip.

Part No.	Description	Port	Pressure Rating	Head Style	Material
F-124H	MicroTight Fitting for 360 µm OD Tubing	6-32 Coned	5,000 psi (345 bar)	Micro Headless Knurl	PEEK Blue
F-125H	MicroTight Fitting for MicroTight Tubing Sleeves	6-32 Coned	4,000 psi (276 bar)	Micro Headless Knurl	PEEK Natural
F-125	MicroTight Fitting for MicroTight Tubing Sleeves	6-32 Coned	4,000 psi (276 bar)	Standard Micro Knurl	PEEK Natural
F-126S	MicroTight Fitting for 1/32” OD Tubing	6-32 Coned	5,000 psi (345 bar)	Standard Micro Knurl	PEEK Red
P-555	MicroTight Plug	6-32 Coned	5,000 psi (345 bar)	Standard Micro Knurl	PEEK Natural
F-112	MicroFerrule for 1/32” OD Tubing	5/16-24 Coned	5,000 psi (345 bar)	-	PEEK Natural
F-132	MicroFerrule for 1/16” OD Tubing	5/16-24 Coned	5,000 psi (345 bar)	-	PEEK Natural
F-152	MicroFerrule for 360 µm OD Tubing	5/16-24 Coned	5,000 psi (345 bar)	-	PEEK Natural
F-172	MicroFerrule for MicroTight Tubing Sleeves	5/16-24 Coned	4,000 psi (276 bar)	-	PEEK Black
P-116	MicroFerrule Plug	5/16-24 Coned	5,000 psi (345 bar)	-	PEEK Black
P-416	MicroTight Female Nut	5/16-24 Coned	4,000–5,000 psi (276–345 bar)	Female Knurl	PEEK Natural
P-416BLK	MicroTight Female Nut	5/16-24 Coned	4,000–5,000 psi (276–345 bar)	Female Knurl	PEEK Black

Instructions for use & tips

First, slide the SealTight nut over the tubing, followed by the SealTight ferrule. Then insert the tubing into the port until it bottoms out. While holding the tubing in place, tighten the nut finger-tight.

Important: For an optimal seal we recommend using the matching SealTight ferrules; these are specifically shaped to work with the internal geometry of the SealTight nuts.

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Micro and nano fittings

The MicroTight® components

Instructions for use & tips

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