Fabrication and Technical Solutions

Designation of Thread Number of threads in 25.4 mm Pitch (P) Height of thread Diameters major (d=D) pitch (d 2 =D 2 ) minor (d 1 =D 1 ) 1/16 28 0.907 0.581 7.723 7.142 6.561 1/8 28 0.907 0.581 9.728 9.147 8.566 1/4 19 1.337 0.856 13.157 12.301 11.445 3/8 19 1.337 0.856 16.662 15.806 14.950 1/2 14 1.814 1.162 20.955 19.793 18.631 5/8 14 1.814 1.162 22.911 21.749 20.587 3/4 14 1.814 1.162 26.441 25.279 24.117 7/8 14 1.814 1.162 30.201 29.039 27.877 1 11 2.309 1.479 33.249 31.770 30.291 1 1/8 11 2.309 1.479 37.897 36.418 34.939 1 1/4 11 2.309 1.479 41.910 40.431 38.952 1 1/2 11 2.309 1.479 47.803 46.324 44.845 1 3/4 11 2.309 1.479 53.746 52.267 50.788 2 11 2.309 1.479 59.614 58.135 56.656 2 1/4 11 2.309 1.479 65.710 64.231 62.752 2 1/2 11 2.309 1.479 75.184 73.705 72.226 2 3/4 11 2.309 1.479 81.534 80.055 78.576 3 11 2.309 1.479 87.884 86.405 84.926 3 1/2 11 2.309 1.479 100.330 98.851 97.372 4 11 2.309 1.479 113.030 111.551 110.072 4 1/2 11 2.309 1.479 125.730 124....

MARYLAND METRICS THREAD DATA CHARTS PIPE THREAD -- BRITISH STANDARD PIPE PARALLEL -- BSPP/BSPF PIPE THREAD -- JAPANESE PIPE PARALLEL -- PF JAPANESE CONDUIT THREAD CTG (from 1/2" to 4") British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) -- (G) Click here to return to the thread data chart page index. BS EN ISO 228-1: 2003 Table 1 Thread dimensions British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) -- (G)   Tolerances on pitch diametera Tolerance on minor diameter Tolerance on major diameter   Diameters Internal thread TD2 External thread Td2 Internal thread TD1 External thread Td Desig-nation of thread Number of threads in 25.4 mm Pitch P Height of thread h major d = D pitch d2 = D2 minor d1 = D1 Lower deviation Upper deviation Lower deviation Class A Lower deviation Class B Upper deviation Lower deviation Upper deviation Lower deviation Upper deviation 1/16 28 0.907 0.581 7.723 7.142 6.561 0 0.107 -0.107 -0.214 0 0 0.282 -0.214 0 1/8 28 0.90...