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COUPLE DE SERRAGE
Le couple exigé pour serrer un boulon est variable selon le matériau constitutif du boulon et sa taille ainsi
que le matériau boulonné. Choisissez la durée de serrage nécessaire en conséquence.
Des valeurs de référence sont indiquées ci-dessous.
(Elles peuvent changer suivant les conditions du serrage.)
FACTEURS AFFECTANT LE COUPLE DE SERRAGE
Le couple de serrage est affecté par une grande variété de facteurs, y compris ceux mentionnés ci-dessous.
Après un serrage, vérifiez toujours le couple à l'aide d'une clé dynamométrique.
1) Tension
Quand la batterie est sur le point d'être complètement déchargée, la tension décroît et le couple de ser-
rage chute.
Conditions de serrage des boulons
Boulons standard M8, M10, M12, M14 de 25 mm
(Taille de boulon: en millimètres)
Couple de serrage
N·m
(kgf-cm)
Durée de serrage (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
Rondelle
Rondelle
Rondelle élastique
Épaisseur de plaque
en acier de 10 mm (3/8")
Boulon
Écrou
Conditions de serrage
*
Les boulons suivants sont utilisés.
Boulon standard: Type à résistance de 4,8
Type à haute résistance de 12,9
Explication du type de résistance
4,8
Résistance à la traction de boulon 588 N/mm
2
(
60 k
g
f/mm
2
)
Limite élastique de boulon
(80% de résistance à la traction)
471 N/mm
2
(48 kgf/mm
2
)
EY6535(EU).book Page 29 Tuesday, March 1, 2005 9:36 AM
29


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