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BRITISH THREAD -- MINIATURE SERIES -- BA


British Thread (British Association) -- Miniature Series
Nominal
Size
BA
Thread
Form
Type
Major
Diameter
mm
d=D
Pitch
mm
p
Threads
per
inch
tpi
Pitch
Diameter
mm
d2=D2
Minor
Diameter
Male Thd.
d3
Thread
Height
H1
Tap
Drill
Diameter
mm
No. 14 BA 1.000 0.230 110.4 0.860 0.720 0.140 0.75
No. 13 BA 1.200 0.250 101.6 1.050 0.900 0.150 0.95
No. 12 BA 1.300 0.280 90.71 1.130 0.960 0.170 1.00
No. 11 BA 1.500 0.310 81.93 1.315 1.130 0.185 1.20
No. 10 BA 1.700 0.350 72.57 1.490 1.280 0.210 1.35
No. 9 BA 1.900 0.390 65.12 1.665 1.430 0.235 1.50
No. 8 BA 2.200 0.430 59.07 1.940 1.680 0.260 1.80
No. 7 BA 2.500 0.480 52.92 2.210 1.920 0.290 2.00
No. 6 BA 2.800 0.530 47.92 2.480 2.160 0.320 2.30
No. 5 BA 3.200 0.590 43.05 2.845 2.490 0.355 2.60
No. 4 BA 3.600 0.660 38.48 3.205 2.810 0.395 2.95
No. 3 BA 4.100 0.730 34.79 3.660 3.220 0.440 3.40
No. 2 BA 4.700 0.810 31.35 4.215 3.730 0.485 3.90
No. 1 BA 5.300 0.900 28.22 4.760 4.220 0.540 4.40
No. 0 BA 6.000 1.000 25.40 5.400 4.800 0.600 5.00