Bolt Edge Distance
Edge Distances
Minimum Edge Distances as identified in BS 5950-1 2000 "Structural use of steelwork in building.
Code of practice for design. Rolled and welded sections".
Notes;
BS EN 1993-3 2005 supersedes this standard and the edge distances in this standard seem to be a bit
less than the ones I have listed. However I have maintained my figures in line with the original
version.
It must be stated that connections under tension with the end edge distance (b = 1,4 D) cannot
withstand the full load that is possible with the bolted connection. An end distance of B = 2D is
required to achieve this maximum strength.
Nominal
Size (d)
Clearance
Hoe(D)
Pitch Min
Min
(A) Edge(B) Edge(C)
M12
14
30
20
18
M16
18
40
26
23
M20
22
50
31
28
M24
26
60
37
33
M27
30
68
42
38
M30
33
75
47
42
M36
39
90
55
49