Thread identification
Thread identification: scope, limits of use and technical checkpoints.
5 guides
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How is the thread type identified on hydraulic fittings?
To identify a thread, the parallel or tapered form, thread pitch and diameter are examined together. The sealing method of the connection must also be defined separately. The fact that parts screw together for a few tur…
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The difference between BSPP and BSPT connections
BSPP refers to the parallel and BSPT to the tapered pipe thread family; looking the same in nominal size does not mean they have the same sealing method. Thread geometry, thread standard and the actual sealing surface o…
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Comparing NPT and NPTF definitions
NPT and NPTF are not the same thing. NPT is evaluated within the scope of the general-purpose pipe thread standard, and NPTF within the scope of the Dryseal design. Similar size and taper do not prove that the connectio…
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Identifying diameter and pitch on metric connections
A metric thread is defined by diameter and pitch; for example, the numbers in M18×1.5 state the nominal thread diameter and the pitch in millimeters. This information alone does not describe the fitting's seating surfac…
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Reading pitch on UN and UNF threads
In unified inch thread designations such as UN and UNF, the nominal diameter and the number of threads per inch are read together. Recognizing the thread family does not on its own determine whether the fitting is a JIC…
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