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Fastening quality assurance
Fastening inspection
X-CR __ P8
tII
hET = Ls – tl = L – tl – hNVS
hNVS = 3.5–4.5 mm
Installation
hNVS
tI
hET
tl ≤ 3 mm
Steel fastened material ″ 3 mm
thick, usually deforms with the
displaced base material to
allow a tight fit between fastened
steel and base material
without pre-drilling.
Because conditions may vary,
trial fastenings are recommended
tl > 3 mm
Without pre-drilling:
Steel fastened material > 3 mm M
thick is too stiff too fully deform
with the displaced base mate-
M
rial. The gap, which increases
with increasing tI, can result in
bending moments being
applied to the nail shank.
With pre-drilling:
If a gap between the fastened
part and the base material is
unacceptable, the fastened
part can be prepared with
drilled holes.
X-CR 14 D12
tII
hET = Ls – tl – 1 = L – tl – hNVS
hNVS = 4–5 mm
ds
o12
120°
Special X-CR
hET = Ls – tl – 1 = L – tl – hNVS
hNVS = 4–5 mm
11 / 2007 4.221
hNVS
tI
hET
3
3
X-CR __ S12
tII
hNVS
tI
hET
To prevent imposition of a
moment on the shank of fastener,
use three fasteners in
a group.