Tube Threads at a Glance

  Compression Flare Inverted Flare Internal Compression AF Nitex style Airbrak Solder-On
Tube O.D.CompressionFlareInverted flareInternal Compression"AF" Nitex style AirbrakeSolder-On
1/8''5/16''-24 UNF5/16''-24 UNF5/16''-28 UNS9/32''-26 Brass Thread1/4''-28 UNF5/16''-26 Brass Thread
3/16''3/8''-24 UNF3/8''-24 UNF3/8''-24 UNF3/8''-24 UNF3/8''-24 UNF1/8''-28 BSP
1/4''7/16''-24 UNS7/16''-24 UNF7/16''-24 UNS7/16''-24 UNS7/16''-20 UNF7/16''-20 UNF
5/16''1/2''-24 UNS1/2''-20 UNF1/2''-20 UNF1/2''-24 UNS1/2''-20 UNF1/4''-19 BSP
3/8''9/16''-24 UNEF5/8''-18 UNF5/8''-18 UNF9/16-24 UNEF9/16''-18 UNF3/8''-19 BSP
1/2''11/16''-20 UN3/4''-16 UNF3/4''-18 UNS3/4''-24 UNS3/4''-16 UNF1/2''-14 BSP
5/8''13/16''-18 UNS7/8''-14 UNF-7/8''-20 UNEF--
3/4''1''-18 UNS1-1/16''-14 UN-1.025''-18 UNS-3/4''-14 BSP
THREAD ABBREVIATIONS & DEFINITIONS
TermDefinition
GASB.S.P. Thread ( Common term in plumbing trade)
M.I.Male Iron - BSP Male-common term in plumbing trade
F.I.Female Iron - BSP Female-common term in plumbing trade
P.TPipe Thread
BSPBritish Standard Pipe
BSPTBritish Standard Pipe Taper
BSPPBritish Standard Pipe Parallel
NPTNational Pipe Taper
NPTFNational Pipe Taper Fuel
NPSNational Pipe Straight
UNFUnified National Fine (Formerly SAE Thread)
SAESociety of Automotive Engineers
J.I.CJoint Industries Conference or J.I.Case
ISO METRICInternational Standards Organisation
ANPAmerican National Pipe
ANPTAmerican National Pipe Taper
NPNational Pipe
UNEFUnified National Extra Fine
UNSUnified National Special (Not standard UNF thread)
UNUnified National (Not standard UNF thread)
BRASSFine thread - always 26TPI regardless of major diameter
DRY SEALNPT to NPS threads are dry seal-no sealing compounds used
CONDUITThread common to Electrical Industry

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