Threads/Standards:
Metric Coarse, Metric Fine, ISO Metric.
UNC, UNF, NPT, BSP or PG.
BSW, BSF and BA.
DIN Standards.
Carbon Steel, Alloy Steel, Duplex Steel
Stainless Steel
Bronze, Brass
Mild Steel
Factors to consider are as follows:
The material used for making compression fittings is extremely important for joining proper connection of pipes and fittings.
Size of the fitting is also important and the right size should be chosen for right application.