BRASS HYDRANT REDUCING ADAPTER
2-1/2" (3.068 OD) NST x 3/4" MIP
for Fire Hydrant or Fire Hose x Male Pipe Thread
Pin Lug, 2-1/2" Female NST or NH x 3/4" Male NPT /IPT Iron Pipe Taper Thread,
Rough Brass Finish
 
COMMONLY USED THREADS
  National Standard
Thread
NH/NST
Straight Iron Pipe
NPSH/IPT
Standard Pipe
Thread
NPT/TIPT
British Standard
Pipe Thread
BSP
Size ODM TPI ODM TPI ODM TPI ODM TPI
¾" 1.375 8 1.035 14 1.050 14    
1" 1.375 8 1.295 11.5 1.315 11.5 1.309 11
1½" 1.990 9 1.878 11.5 1.900 11.5    
2" 2.515 8 2.352 11.5 2.375 11.5 1.882 11
2½" 3.068 7.5 2.841 8 2.875 8    
3" 3.623 6 3.470 8 3.500 8 2.960 11
3½" 4.243 6 3.970 8 4.000 8 4.125 3
4" 5.010 4 4.470 8 4.500 8 4.625 3
4½" 5.760 4 4.970 8 5.000 8 5.125 3
5" 6.260 4     5.563 8 5.625 3
6" 7.025 4     6.625 8 6.625 3