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Faktorer som påverkar åt-
dragningsmomentet
Åtdragningsmomentet påverkas av en
ngd olika faktorer, bl.a. följande. Åtdrag-
ningsmomentet r alltid kontrolleras med
en momentnyckel efter åtdragning.
1) Spänning
När batteriet håller på att laddas ur
sjunker snningen, vilket medr att
åtdragningsmomentet sjunker.
Bultåtdragningsförhållanden
20
(
204
)
40
(
408
)
60
(
612
)
80
(
816
)
100
(
1020
)
120
(
1224
)
140
(
1428
)
165
(
1683
)
12 3
M12
M10
M14
M16
Åtdragningstid (sek.)
M10, M12, M14, M16 Standardbult
Åtdragningsmoment
N • m
(kgf-cm)
M10
M8
M12
M14
20
(204)
40
(408)
60
(612)
80
(816)
100
(1020)
120
(1224)
140
(1428)
165
(1683)
12 3
Åtdragningstid (sek.)
M8, M10, M12, M14 Höghållfast bult
Åtdragningsmoment
N • m
(kgf-cm)
Bult
Mutter
Bricka
Stålplåt
Tjocklek 10 mm
Bricka
Fjäderbricka
Åtdragningsförhållanden
* Följande bultar används.
Standardbult: hållfasthetsklass 6,8
Höghållfast bult: hållfasthetsklass 12,9
6,8
Förklaring av hållfasthetsklass
Bultens sträckgräns
(80% av brottgräns)
48 kgf/mm
2
(68000 psi)
Bultens brottgräns 60 kgf/mm
2
(85000 psi)
2) Åtdragningstid
Längre åtdragningstid ger ökat åtdrag-
ningsmoment. Överdriven åtdragning
innebär dock ingen förbättring utan
förkortar verktygets livslängd.
3) Olika bultdiametrar
Storleken bultdiametern påverkar
åtdragningsmomentet.
I allmänhet gäller att åtdragningsmo-
mentet ökar ju större bultdiametern är.
(gäller endast
EY7271)
(gäller endast
EY7271)
EY7270(EU).indb 77 2006/05/25 13:26:48
77


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