Threading

1/2-20
1/2-20 UNF-2B
1/2-20UNF
???" - 13NC
???" - 20NC
BSP
BSP, NPT
Full Threaded
Fully Threaded
M6 x 1.0
Metric
Metric, NPT
NPT
NPT, BSP
NPT, SAE
NPT, UN/UNF-2A
Partially Threaded
SAE
UN/UNF-2A