There are many different thread forms in use today. The most common are;
BPV thread
API thread profile gauge
Thread profile gauge
API 5b thread gauges
API thread gauges
Pipe thread gauges
API Thread Gauge Manufacturer & Supplier
Ring gauge use
Pipe threader
Acme thread
Feeler gauge set
Ring gauge set
threaded pipe plug
step gauge
NPT thread gauge
Tapered pipe thread