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Home > Technical Data > Thread Forms of Fluid Connectors
 
Thread Forms of Fluid Connectors



National Pipe Thread Fuel (NPTF)
  • Thread conforms to ANSI B1.20.3
  • Physically interchangeable with NPT but has modified
    threads for better pressure tight sealing
  • Tapered thread profile seals by metal to metal interference fit,
    usually requires sealing compound for pressure tight connections
  • Pitch and diameter are measured in inches
  • Taper angle is 0.75≤ per foot or 1° 47’
  • Thread angle is 60°
Straight Thread O-Ring (SAE)
  • Thread conforms to ISO 263 and ANSI B1.1 Unified
  • Port conforms to ISO 11926 and SAE J1926
  • Commonly called straight thread O-ring fittings
  • Pitch and diameter are measured in inches, 1Z\zn-12 UN-2B
  • Threads are parallel and requires O-ring for pressure tight connection
  • Thread angle is 60°
British Standard Pipe Tapered (BSPT)
  • Thread conforms to ISO 7
  • Pitch and diameter are measured in inches, e.g. G3/8-19
  • Tapered thread profile seals by metal to metal interference fit,
    usually requires sealing compound for pressure tight connection
  • Taper angle is 1° 47’, the same as NPT(F)
  • Thread angle is 55°
  • Not interchangeable with NPT(F)
British Standard Pipe Parallel (BSPP)
  • Thread conforms to ISO 228-1
  • Port conforms to ISO 1179
  • Pitch and diameter measured in inches, e.g. G1/4-19
  • Parallel threads require O-ring, crush washer, gasket or
    metal to metal seal between connections for pressure tight connection
  • Thread angle is 55Ί
  • Not interchangeable with SAE or NPT(F)
Metric Straight Thread O-Ring
  • Thread conforms to ISO 261
  • Port conforms to ISO 6149 and SAE J2244
  • Pitch and diameter measured in millimeters, e.g. M22 x 1.5
  • Parallel threads require O-ring for pressure tight connection
  • Thread angle is 60°
  • Easily identified by raised ridge on female port counterbore
  • Not interchangeable with SAE or BSPP




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