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Threads
HPLC employs several thread sizes. Most common are 1/4-28, 10-32 and
M6. The first two are U.S. Customary System measurements while the
third, the M6, is an International Metric System designation.
| U.S. Customary System |
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| The first number indicates the diameter of the
threaded portion of the nut (not the tubing diameter). Thread
diameter numbers range from 1 (.073") to 12 (.216").
Beyond .216" the thread description is the thread per inch
count. Thus, a 1/4-28 male nut [Figure
7] has a 1/4" (.250") diameter thread barrel
and 28 threads per inch. A 10-32 male nut [Figure
8] has a 10 (.190") thread barrel and 32 threads
per inch, a narrower nut with a denser thread count. |
| International Metric System |
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| The Metric System uses a one number thread description.
Metric nuts in HPLC typically have one thread per millimeter
and the M simply stands for metric. The single number refers
to the diameter of the thread barrel in millimeters. Thus, an
M6 nut [Figure
9] is 6mm in diameter and has 1 thread per millimeter.
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