NPT and BSPT Fittings

End Fitting Specification

  • 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

Alternatives - Fittings in Zinc Plated Carbon Steel

 

Fixed Male NPT or BSPT

Nominal Hose Size *Fitting Length A  Inside Diameter I  Weight of Fitting 
in  mm in mm in mm Kg Lbs
1/2 15 25/8 67 0.38 9.53 0.10 0.22
3/4 20 31/2 89 0.63 15.88 0.18 0.40
1 25 37/8 98 0.80 20.24 0.29 0.64
11/4 32 43/8 110 1.03 26.21 0.45 0.99
11/2 40 51/8 130 1.25 31.75 0.60 1.32
2 50 51/2 140 1.75 44.45 0.84 1.85
21/2 65 63/4 170 2.25 57.15 1.70 3.75
3 80 63/4 170 2.63 66.70 2.53 5.58
4 100 71/2 190 3.50 88.90 3.99 8.80

*Fitting Lengths listed are for Corroflon braided only hose grades (SS, PB, HB, KYB). Approximately 33% longer lengths apply to the rubber covered hose grades (RC, SI, FP).

 

Fixed Female NPT

Nominal Hose Size NPT 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 2.72 69 0.38 9.53 0.18 0.40
3/4 20 3/4 3.54 90 0.63 15.88 0.22 0.49
1 25 1 3.82 97 0.80 20.24 0.33 0.73
11/2 40 1 1/2 4.96 126 1.25 31.75 0.75 1.65
2 50 2 5.16 131 1.75 44.45 1.06 2.34

*Fitting Lengths listed are for Corroflon braided only hose grades (SS, PB, HB, KYB). Approximately 33% longer lengths apply to the rubber covered hose grades (RC, SI, FP).