Boltpattern 

120x55mm


Note that the military flange extends below the bumper,  
allowing a rotating coupling that goes *through* the flange, 
unlike the direct bolt-pattern on the closed box-section 
bumper itself (civil default)


Correction: 
The secondary civil cross member is not a closed box-section, 
but an U-profile, still with a center hole, to accommodate a 
'go-through' rotating pintle.


Addition:
The secondary/civil cross member is needed to clear the fuel 
tank for rear-protruding rotating hitches (both civil/bolt 
and military/hook (both manual and automatic))
(note that this back-clearance is already present on TGB20, 
which has a main rear bumper/frame-section extended by a few 
decimeters!)



Diameter hole = 75mm 
(= also conform specification of the 120x55mm size, couplings have a neck with 74mm diameter)

Material thickness of secondary/civil bumper is 5mm.
Material thickness of firefighter ball-hitch brackets is 10mm.





 English/Swedish
-----------------
   ball = kula

 pintle = krok

    pin = sprint








Specifications secondary/civil/lower tow bar:

U-profile: 

5mm wall thickness (doubled to 10mm at the 120x55mm flange) 

110mm internal height (120mm outside height) 

60mm outside depth


Note that most rubber dampened pintles have the damping element packed inside a metal disk 
that has a *larger* diameter than the above 110mm (about 120-130mm)....however, because 
the metal disks are sloped on the 'inside' (facing eachother, flange inbetween), they 
require less than this 120-130mm, and still fit, although not with much margin....

(but since the metal parts are 'static' in lateral context (unlike the rubber & pintle 
itself), they don't move with suspension/dampening, so it all seems to work according 
to plan/spec's)