BS 4933 - 1973 Metric Cup Square Bolts


Unit: mm
Screw Thread
d
M5 M6 M8 M10 M12 M16 M20 M24
P Pitch
dk max
min
k1 max
min
k max
min
s max
min
ds max
min
0.8 1 1.25 1.5 1.75 2 2.5 3
11.3 13.5 18 22.5 27 36 45 54
10.2 12.4 16.9 21.2 25.7 34.4 43.4 52.1
3.1 3.6 4.75 5.75 6.75 8.9 10.9 13.1
2.5 3 4 5 6 8 10 12
3.1 3.6 4.8 5.8 6.8 8.9 10 13
2.5 3 4 5 6 8 10 12
5.48 6.48 8.58 10.58 12.7 16.7 20.84 24.84
4.52 5.52 7.42 9.42 11.3 15.3 19.16 23.16
5.48 6.48 8.58 10.58 12.7 16.7 20.84 24.84
4.52 5.52 7.42 9.42 11.3 15.3 19.16 23.16
①,When d≤M12,
if L≤75mm,then b=L-K1;
if 75<L≤125mm,then b=2d+6;
if 125<L≤200mm时,then b=2d+12;
if L>200mm时,then b=2d+25;
②,When d>M12,
if L≤125mm时,then b=2d+6;
if 125<L≤200mm时,then b=2d+12;
if L>200mm时,then b=2d+25;
③,Standard nominal lengths are not specified in this standard, it may however, as a result of experience of usage,be possible to include these details at a future revision.
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