MINIMUM DISTANCES FOR SHEAR LOADS
Load-to-grain angle α = 0°
Load-to-grain angle α = 90°
SCREWS INSERTED WITH PRE-DRILLING HOLE (1)
SCREWS INSERTED WITH PRE-DRILLING HOLE (1)
5
5
a1
[mm]
5∙d
25
4∙d
20
a2
[mm]
3∙d
15
4∙d
20
a3,t
[mm]
12∙d
60
7∙d
35
a3,c
[mm]
7∙d
35
7∙d
35
a4,t
[mm]
3∙d
15
7∙d
35
a4,c
[mm]
3∙d
15
3∙d
15
SCREWS INSERTED WITHOUT PRE-DRILLING HOLES (2) 5 a1
[mm]
8∙d
40
a2
[mm]
4∙d
20
a3,t
[mm]
12∙d
60
a3,c
[mm]
5∙d
25
a4,t
[mm]
5∙d
25
a4,c
[mm]
4∙d
20
d = nominal screw diameter
stressed end -90° < α < 90°
a2 a2 a1 a1
unloaded end 90° < α < 270°
F α
α F a3,t
stressed edge 0° < α < 180°
unload edge 180° < α < 360°
α F α
a4,t
F a4,c
a3,c
NOTES: The minimum distances comply with the EN 1995:2014 standard in accordance with ETA-11/0030.
(1)
(2)
The minimum distances are in accordance with ETA-11/0030 considering wood elements with a minimum width of 12 ·d and a minimum thickness of 4 · d.
In the case in which these conditions are not respected, please see the KKF screw for the minimum distances.
258 | KKT COLOR A4 | AISI316 | OUTDOOR
In the case of Douglas fir elements (Pseudotsuga menziesii), the minimum distances parallel to the grain (a1, a3,t, a3,c) must be multiplied by a coefficient of 1,5.