NPT & BSPT Fittings

End Fitting Specifications

  • NPT Taper Threads to American National Standard Pipe Taper Thread design to ANSI/AMSE B1.20.1.
  • BSPT Threads to British Standard Pipe Taper Thread design to BS21

Alternatives - Parallel Threads, Metric Threads and Others.

End Fitting Materials

  • Fittings in Grade 316L SS
  • Ferrules, most in Grade 304 SS, some sizes in Grade 316L SS
  • Available in other materials to special order

Alternatives - Hydraulic design BSPT Male Fittings in Zinc Plated Carbon Steel, to special order.

Surface Finish:

  • All surface finishes are to ASME BPE-SF-O (No finish required).
  • If a specified finish on a particular surface is required, please state on the enquiry and order.


Fixed Male NPT or BSPT

Nominal Hose SizeNPT or BSPT Thread Size *Fitting Length A Fitting Inside Diameter I Weight of Fitting
in mm in in mm in mm Kg Lbs
1/2 13   1/2 2.40 61 0.37 9.40 0.14 0.30
3/4      20 3/4 2.68 68 0.62 15.75 0.25 0.54
25 1 3.07 78 0.85 21.50 0.33 0.73
1/4  32 1/4 3.58 91 1.03 26.21 0.61 1.34
1/2 40 1/2 3.82 97 1.25 31.75 0.81 1.78
50 2 4.57 116 1.76 44.60 1.17 2.58
21/265 21/2 5.31 135 2.25 57.15 1.84 4.04
380 3 5.39 137 2.63 66.7 2.49 5.47


Fixed Female NPT

Nominal Hose Size NPT Thread Size *Fitting Length A Fitting Inside Diameter I Weight of Fitting
in mm in in mm in mm Kg Lbs
1/2 13   1/2 2.40 61 0.37 9.40 0.18 0.39
3/4    20 3/4 2.52 64 0.62 15.75 0.24 0.54
25 1 3.23 82 0.85 21.50 0.37 0.81
1/2 40 1/2 3.62 92 1.25 31.75 0.83 1.82
50 2 4.13 105 1.76 44.60 1.24 2.72