Pommier A5442 Notice Originale page 24

5.3 Screwed assembly according to an alternative diagram:
The following spreadsheet can be used to adapt the POMMIER-recommended drilling diagram to the customer's
needs in terms of:
Mounting hole positioning
-
Diameter of screws used
-
Number of screws used
-
The reference values given below were validated by POMMIER during approval testing.
Gross Combination Weight Rating
Thrust force
Height of screws - bumper
Moment (or lever arm)
Drilling diagram width
Drilling diagram height
Number of screws
Screw diameter
Mounting surface area
Thread root cross-section
Maximum shear force**
* Force P2 is limited to 180 kN maximum
** The ISO 20898 T1 standard provides the minimum tensile strength for a 10.9 class screw: Rm = 1000 N/mm². The maximum shear stress is commonly
calculated as 70% of Rm, i.e. 700 N/mm².
The table below provides the characteristics of screws suitable for use
Screw diameter
M12
M14
M16
Parameters recommended by POMMIER (Specimen)
GCWR
P2 reference
L
M2 reference
A
Z
N
M
S
Sff
F
Table 7
Thread root diameter
10.11mm
11.84mm
13.84mm
Table 8
-
GCWR (in kg) x 0.85 x 9.81
-
P2 x L
-
-
-
-
A x Z
-
Sff x 700 x N / 1000
Thread root cross-section
21,600 kg
180 kN*
459.75 mm
82755 kN.mm
150mm
100mm
10
14
15,000 mm²
110 mm²
770 kN
80 mm²
110mm²
150mm²
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