Hey help please?
Answer:
1) Conventional thread type for fasteners - usually 60° profile with easy-to-assemble pitch clearance (allowance) and tolerance for easy to assemble situations that have dirt, oil, etc.
2) Pipe taper thread - designed for pressurized sealing of fluids. Used on the oil pressure sensor, radiator coolant sensor and others. Has a 60° thread profile, but the pitch diameter is conical rather than cylindrical so that the thread resists leakage when completely tightened. Is intended to be used with a thread sealant or teflon tape to provide 100% leak tight seal. (There is a system called "Dry Seal" that doesn't need a sealant, but is not used in automotive applications because it is sensitive to dirt and crud messing up the threads)
There are other systems (Metric/US/English/ACME/Left-h... Threads, etc), but as to thread *TYPES*, the biggest difference is found in cylindrical threads (normal fasteners) vs. conical threads (taper threads).
what is the question all about ??
Threads?
or Vehicles?
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