Bæreevner - Konstruktionsskruer, fuldgevind - cylinderhoved

ESCRFTZ

Bæreevner

Timber to Timber characteristic capacities

Art. nr. Product characteristic capacities - Timber to Timber C24
Axial resistance Shear resistance parallel to the grain depending of t1 [Rv.0.k] [kN] Shear resistance perpendicular to the grain depending of t1 [Rv.90.k] [kN]
t1 [mm] Rax.k [kN] 35 [mm] 40 [mm] 45 [mm] 60 [mm] 75 [mm] 80 [mm] ≥100 [mm] 35 [mm] 40 [mm] 45 [mm] 60 [mm] 75 [mm] 80 [mm] ≥100 [mm]
ESCRFTZ8.0X120 60 5.24 4.47 4.68 4.68 4.68 4.68 4.68 - 3.63 3.82 4.02 4.09 4.02 3.82 -
ESCRFTZ8.0X140 70 6.29 4.74 4.94 4.94 4.94 4.94 4.94 4.94 3.9 4.09 4.29 4.35 4.35 4.35 4.09
ESCRFTZ8.0X160 80 7.34 5 5.2 5.2 5.2 5.2 5.2 5.2 4.16 4.35 4.55 4.61 4.61 4.61 4.61
ESCRFTZ8.0X180 90 8.38 5.26 5.46 5.46 5.46 5.46 5.46 5.46 4.42 4.61 4.81 4.87 4.87 4.87 4.87
ESCRFTZ8.0X200 100 9.43 5.52 5.73 5.73 5.73 5.73 5.73 5.73 4.65 4.87 5.07 5.14 5.14 5.14 5.14
ESCRFTZ8.0X240 120 11.53 6.05 6.25 6.25 6.25 6.25 6.25 6.25 4.65 5.03 5.43 5.56 5.56 5.56 5.56

These capacities are valid for:

  • Timber element under the head with thickness ≤ t1 disclosed in adjacent column
  • Screw axis between 45° and 90° from timber grain for ESCR(XXX), and 90° from timber grain for all other screws.

For tightening screws (partially threaded), t1 dimension is the maximum thickness of the under-head timber member for which the thread is fully in the pointside timber member, for an optimum installation and tightening.

The shear capacities are given for several timber thicknesses t1 of the under-head member under the following configurations:

  • Load axis at 0° from both timber grains Rv.0°.k
  • Load axis at 90° from both timber grains Rv.90°.k

These capacities are valid for C24 timber grades or higher
The pre-drilled hypothesis for capacity and distances calculation is fulfilled.
For partial threaded screws, capacities are only given for configurations where the thread is less than 5mm in under-head timber member, in order to achieve optimum installation and tightening.
Clause (2) in 8.3.1.2 from EN1995-1-1:2004+A2:2014 about embedment length is ignored in these calculations.

Crossed pairs of screws - characteristic capacities

Art. nr. Crossed pair of screws - characteristic capacities
Header Joist Installation distance Characteristic capacities (Pull-out / Buckling) Rv.pair = min(Rw.k.pair ; Rbuck.k.pair) [kN]
bh min [mm] hj min [mm] 1 pair 2 pairs m [mm] mi [mm] 1 pair 2 pairs
bj min [mm] bj min 2 [mm] Rw.k.pair [kN] Rbuck.k.pair [kN] Rw.k.pair [kN] Rbuck.k.pair [kN]
ESCRFTZ8.0X120 64 128 84 124 68 73 7.41 3.7 + 13.99 /kmod 13.82 6.91 + 26.11 /kmod
ESCRFTZ8.0X140 64 128 84 124 68 73 8.89 4.44 + 13.99 /kmod 16.59 8.29 + 26.11 /kmod
ESCRFTZ8.0X160 67 128 84 124 68 73 10.37 5.18 + 13.99 /kmod 19.35 9.67 + 26.11 /kmod
ESCRFTZ8.0X180 74 140 84 124 68 73 11.85 5.92 + 13.99 /kmod 22.12 11.06 + 26.11 /kmod
ESCRFTZ8.0X200 81 154 84 124 75 80 13.33 6.66 + 13.99 /kmod 24.89 12.44 + 26.11 /kmod
ESCRFTZ8.0X240 95 182 84 124 89 94 16.3 8.15 + 13.99 /kmod 30.42 15.21 + 26.11 /kmod