BS Fixings

Screw sizes

Gauge (mm) Length (mm) Imperial Size

3mm 12 4 x 1/2
16 4 x 5/8
20 4 x 3/4
25 4 x 1
30 4 x 1 1/4
40 4 x 1 1/2

3.5mm 12 6 x 1/2
16 6 x 5/8
20 6 x 3/4
25 6 x 1
30 6 x 1 1/4
40 6 x 1 1/2

4mm 12 8 x 1/2
16 8 x 5/8
20 8 x 3/4
25 8 x 1
30 8 x 1 1/4
35 8 x 1 3/8
40 8 x 1 1/2
45 8 x 1 3/4
50 8 x 2
60 8 x 2 3/8
70 8 x 2 3/4

4.5mm 25 9 x 1
30 9 x 1 1/4
35 9 x 1 3/8
40 9 x 1 1/2
45 9 x 1 3/4
50 9 x 2
60 9 x 2 3/8
70 9 x 2 3/4
75 9 x 3

5mm 25 10 x 1
30 10 x 1 1/4
35 10 x 1 3/8
40 10 x 1 1/2
45 10 x 1 3/4
50 10 x 2
60 10 x 2 3/8
70 10 x 2 3/4
75 10 x 3
80 10 x 3 1/4
90 10 x 3 1/2
100 10 x 4

6mm 30 12 x 1 1/4
40 12 x 1 1/2
50 12 x 2
60 12 x 2 3/8
70 12 x 2 3/4
75 12 x 3
80 12 x 3 1/4
90 12 x 3 1/2
100 12 x 4
110 12 x 4 3/8
130 12 x 5 1/8
150 12 x 6
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