Stainless Steel Fittings

Valco stainless steel fittings deliver exceptional stability and reliability for high-pressure fluidic connections in GC, HPLC, and UHPLC systems. Engineered for demanding analytical environments, these precision machined components provide secure, leak-resistant performance across a wide range of laboratory applications.

Valco fittings utilize a compression-style ferrule design, where the ferrule compresses onto the tubing as the nut is tightened into the port end. This creates a consistent, reproducible seal without deforming the tubing or restricting flow, helping maintain chromatographic integrity under elevated pressures.

Stainless Steel Fittings

PART NUMBER DESCRIPTION LENGTH
ZN.5-101/32" Valco male nut0.30"
LZN.5-101/32" Valco male nut0.45"
ZF.5S6-101/32" Valco ferrule—
ZN1-101/16" Valco male nut0.43"
MZN1-101/16" Valco male nut0.50"
LZN1-101/16" Valco male nut0.75"
ZF1-101/16" Valco ferrule—
ZP11/16" Valco plug0.43"
ZN2-101/8" Valco male nut0.57"
ZP21/8" Valco plug0.57"
ZF2-101/8" Valco ferrule—

Stainless Steel External Nuts

PART NUMBER DESCRIPTION LENGTH
EN11/16" Valco female nut—
EN21/8" Valco female nut—
EN41/4" Valco female nut—
Key Definitions â–¶
Compression Fitting
A fitting design that uses a nut and ferrule to compress onto tubing, forming a secure, leak-resistant seal without adhesives or permanent deformation.
Ferrule
A small metal sleeve that is compressed by the nut to grip the tubing and create a reliable seal inside the port.
High-Pressure Fitting
A fitting engineered to maintain leak-free connections under elevated pressures commonly encountered in GC, HPLC, and UHPLC systems.
Tubing OD
The outer diameter of tubing. Valco stainless steel fittings are selected based on tubing OD to ensure proper compression and sealing.
Port End
The threaded receiving port on a valve or instrument where the fitting is installed and sealed.
Chromatographic Integrity
The ability of a system to maintain consistent flow paths and peak shape without leaks, deformation, or flow restriction.
Frequently Asked Questions â–¶
What are Valco stainless steel fittings used for?
Valco stainless steel fittings are used to create secure, leak-resistant connections in GC, HPLC, and UHPLC systems where high pressure and chemical compatibility are required.
How do compression-style fittings work?
Compression fittings use a nut and ferrule to compress onto the tubing as the nut is tightened into the port, forming a reproducible seal without permanently deforming the tubing.
Are Valco stainless steel fittings compatible with other HPLC systems?
Yes. Valco fittings follow standard HPLC thread and port dimensions, making them compatible with most major chromatography instruments and valve platforms.
Can Valco stainless steel fittings be reused?
Nuts may often be reused, but ferrules should be inspected carefully. For optimal sealing—especially in high-pressure applications—replacing deformed ferrules is recommended.
Are these fittings suitable for UHPLC pressures?
Yes. Valco stainless steel fittings are engineered for high-pressure environments and are commonly used in UHPLC systems when properly installed.