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Metric 90°Countersunk Head Nibbed Bolts

BS 4933 - 1973

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Thread Size
d

M10

M12

M16

M20

M24

P	Pitch
d_s	max
	min
d_k	max (Theoretical)
	min
k₁
s
h

0.8	1	1.25	1.5	1.75	2	2.5	3
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
10	12	16	20	24	32	40	48
8.5	10.2	13.6	17	20.4	27.2	34	40.8
3.2	3.8	5	6.3	7.5	10	12.5	15
1.3	1.5	2	2.5	3	4	5	6
0.6	0.8	1.0	1.3	1.5	2.0	2.5	3.0

①,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；
②,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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