Click Specification

Metric 90°Countersunk Head Bolts

BS 4933 - 1973

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Thread Size
d

M10

M12

M16

M20

M24

P	Pitch
d_s	max
d_s	min
d_k	Max=Ref.
d_k	min

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

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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Similar Standards

1	[ASME/ANSI] ASME/ANSI B 18.5 - 2012	Countersunk Bolts and Slotted Countersunk Bolts [Table7] (A307, SAE J429, F468, F593)
2	[ASME/ANSI] ASME/ANSI B 18.5 - 2008	Countersunk Bolts and Slotted Countersunk Bolts,(Inch Series)
3	[EN] EN 14399 (-7 Cs bolt) - 2018	High-strength structural bolting assemblies for preloading - Part 7: System HR — Countersunk head bolt
4	[ASME] ASME B 18.5 - 2012 (2017)	Countersunk Bolts and Slotted Countersunk Bolts [Table7] (A307, SAE J429, F468, F593)
5	[EN] EN 14399 (-7) - 2007	High-strength structural bolting assemblies for preloading - Part 7: System HR — Countersunk head bolt
6	[NF] NF E 25-801-7 - 2008	High Strength Slotted Bolts For Steel Structure