FAQ

What size threads are on the end fittings of my HPLC column?

31 Jul 2025

Fittings on all HPLC and UHPLC columns have 10-32 threads. However, you will find that fittings and columns from Waters, Rheodyne, SSI, and Gasukura have different seating depths, as shown below, even though the threads are still 10-32. Restek’s universal 10-32 PEEK column connectors and new EXP fittings will accommodate any of these configurations.

Fitting styles differ among various manufacturers, but all HPLC and UHPLC column fittings have 10-32 threads.

Parker Fitting
Valco Fitting
Waters Fitting
Rheodyne Fitting
Swagelok Parker A-Lok Fitting

Parker

Valco

Waters

Rheodyne

Swagelok
Parker A- Lok

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