FERRI ZMT - Page 85

85
Rev. 5.1
ZMT-ZMTE
ROUTINE MAINTENANCE
07-Serraggio viti
SYMBOL MEANING
Screw
Hex head
Large
Fine
The torque values reported in table 3 correspond to 80% of the yield stress limitIn each column two values are reported
of which the rst refers to a friction coe󰀩cient of 0.10 and the second to a coe󰀩cient of 0.14. For our applications it
is advised to refer to the values corresponding to the coe󰀩cient of 0.14.
The couplings are to be considered orientative in that they can notably vary in measurement in relation to the type of
joint (rigid, semi-rigid, elastic etc.), the material on which the screws are tightened, the length of the screws, the type
of screwdriver employed for tightening (impulse, friction, continuous torque etc.), the condition of the edging nish etc.
If the joint is carried out with nuts or self locking rings, the torque value should be increased by approx. 15%