British Standard Fine – fijne stap – BSF

British Standard fine (BSF) – Fijne stap

Nominal
Size
BSF		 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
3/16″ BSF 4.763 0.794 32 4.255 3.747 0.508 4.00
7/32″ BSF 5.556 0.907 28 4.975 4.394 0.581 4.60
1/4″ BSF 6.350 0.977 26 5.725 5.100 0.625 5.30
9/32″ BSF 7.142 0.977 26 6.518 5.893 0.625 6.10
5/16″ BSF 7.938 1.156 22 7.199 6.459 0.739 6.80
3/8″ BSF 9.525 1.27 20 8.712 7.899 0.813 8.30
7/16″ BSF 11.113 1.411 18 10.209 9.304 0.904 9.70
1/2″ BSF 12.700 1.588 16 11.684 10.668 1.017 11.10
9/16″ BSF 14.288 1.588 16 13.272 12.256 1.017 12.70
5/8″ BSF 15.875 1.814 14 14.712 13.549 1.162 14.00
11/16″ BSF 17.463 1.814 14 16.300 15.137 1.162 15.50
3/4″ BSF 19.050 2.117 12 17.693 16.336 1.355 16.75
13/16″ BSF 20.638 2.117 12 19.281 17.924 1.355 18.25
7/8″ BSF 22.225 2.309 11 20.747 19.269 1.479 19.75
1″ BSF 25.400 2.54 10 23.774 22.148 1.627 22.75
1 1/8″ BSF 28.575 2.822 9 26.769 24.963 1.807 26.50
1 1/4″ BSF 31.750 2.822 9 29.944 28.138 1.807 28.75
1 3/8″ BSF 34.925 3.175 8 32.893 30.861 2.033 31.50
1 1/2″ BSF 38.100 3.175 8 36.068 34.036 2.033 34.50
1 5/8″ BSF 41.275 3.175 8 39.243 37.211 2.033 38.00
1 3/4″ BSF 44.450 3.629 7 42.126 39.802 2.324 40.50
2″ BSF 50.800 3.629 7 48.476 46.152 2.324 47.00
2 1/4″ BSF 57.150 4.234 6 54.440 51.730 2.711 53.00
2 1/2″ BSF 63.500 4.234 6 60.790 58.080 2.711 59.00
2 3/4″ BSF 69.850 4.234 6 67.140 64.430 2.711 n/a
3″ BSF 76.200 5.08 5 72.946 69.692 3.253 n/a
3 1/4″ BSF 82.550 5.08 5 79.296 76.042 3.253 n/a
3 1/2″ BSF 88.900 5.645 4 1/2 85.285 81.670 3.614 n/a
3 3/4″ BSF 95.250 5.645 4 1/2 91.635 88.020 3.614 n/a
4″ BSF 101.600 5.645 4 1/2 97.985 94.370 3.614 n/a
4 1/4″ BSF 107.950 6.35 4 103.886 99.822 4.066 n/a