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COPPIA DI SERRAGGIO
La potenza necessario per serrare un bullone varia a seconda del materiale e delle dimensioni del bullone,
nonché del materiale in cui si inserisce il bullone. Selezionare la durata di tempo di serraggio di conseg-
uenza.
I valori di riferimento sono forniti di seguito.
(Possono variare a seconda delle condizioni di serraggio.)
FATTORI CHE INFLUISCONO SULLA COPPIA DI SERRAGGIO
La coppia di serraggio è influenzata da vari fattori, tra cui quelli sotto indicati. Dopo il serraggio, controllare
sempre la coppia con una chiave torsiometrica.
1) Tensione
Quando il pacco batteria è quasi scarico, la tensione scende e la coppia di serraggio cala.
Condizioni di serraggio bullone
Bullone standard M8, M10, M12, M14 x 25 mm
(Dimensioni bullone: millimetri)
Coppia di serraggio
N·m
(kgf-cm)
Tempo di serraggio (Sec.)
19,6
(200)
39,2
(400)
58,8
(600)
78,5
(800)
98,1
(1000)
0,1 0,25 0,5 1 2
3
M8
M10
M12
127,4
(1300)
117,7
(1200)
M14
Rondella
Rondella
Rondella a molla
Piastra di acciaio dello
spessore di 10 mm (3/8")
Bullone
Dado
Condizioni di serraggio
* Sono usati i seguenti bulloni.
Bullone standard: Tipo forza 4,8
Tipo ad alta tensilità 12,9
Spiegazione del tipo di forza
4,8
Forza tensile del bullone 588 N/mm
2
(
60 k
g
f/mm
2
)
Punto di cedimento bullone
(80% della forza tensile)
471 N/mm
2
(48 kgf/mm
2
)
EY6535(EU).book Page 37 Tuesday, March 1, 2005 9:36 AM
37


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