Thread form and compound function are separate choices
- BSPT / R
This pipe-thread family has specified tapered and mating forms. Confirm the exact R, Rc or Rp combination rather than substituting by appearance.
- NPS / NPSMThis term
The straight envelope differs from NPT taper. Require the full straight-thread designation and its separate sealing arrangement.
- NPTF
The dryseal form controls crest and root interaction. It is a distinct specification, with assembly conditions that must be verified.
- Thread sealant
The compound acts on a permitted thread leakage path. Follow the specified type and application rather than assuming every threaded joint seals here.
- Threadlocker
The adhesive provides its specified locking function. Its presence does not prove a fluid-tight joint or an approved installation.
Straight and tapered pipe interfaces use different sealing arrangements. A thread sealant addresses a leakage path; a threadlocker addresses the specified resistance to loosening.
Simplified thread envelopes, not dimensional profiles. Compound compatibility and permitted use must be checked, especially on electrical contacts and Ex flamepaths.