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Threading Selection Chart 

Minimum
Bore Dia
Internal
External
Standard Thread Forms AvailableProduct Range 
ø0.73mmInternalISO, Tr, NPT, UN, UNC/UNF, Whitworthsimturn AX
ø6mm

Internal

55°, 60°, ISO, UN, Whitworth, BSPT, NPT, NPTF, Acme, Stub Acme,
Tr, Rd, UNJ, MJ, Buttress, Sage, Pg, API, ELC, Buttress Casing, Vam
GTi

External55°, 60°, ISO, UN, Whitworth, BSPT, NPT, NPTF, Acme, Stub Acme,
Tr, Rd, UNJ, MJ, Buttress, Sage, Pg, API, ELC, Buttress Casing, Vam
GTi
ø9mmInternalISO, Tr, Whitworth, Acme, Stub Acme, NPT, UNsimturn DX
ø38mmInternalISO, Whitworthsimturn GX

ExternalISO, Whitworthsimturn GX
ø43mmInternalISO, UN, Whitworth, Tr, Acme, Stub Acme, NPT simturn E3

ExternalISO, UN, Whitworth, Tr, Acme, Stub Acme, NPTsimturn E3

ExternalISOsimturn K2

ExternalISOsimturn C4