NPT = National Pipe Taper
NPT is a U.S. standard for tapered threads widely used on pipes and fittings for over 100 years.
NPT = US & Canada, oil & gas
NPT = expensive (eg. SS304 Reducing Socket 1" to 1/2 inch female thread, RM 48)
BSPT = British Standard Pipe Taper
BSPT is common in Malaysia, Australia and the commonwealth countries, especially ball valve, nipple and pressure gauge
BSPT = cheapest (eg. SS304 Reducing Socket 1" to 1/2 inch female thread, RM 14)
NPT thread is angled at 60 degrees while
BSPT is angled at 55 degree.
NPT & BSPT for 1/2 inch and 3/4 inch is almost same.
Remark: Never screw NPT into BSPT together
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