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 (A) |
Min Edge(B) |
Min 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 |
|