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4,8
Förklaring av hållfasthetsklass
Bultens sträckgräns
(80 % av brottgräns)
32 kgf/mm
2
(45 000 psi)
Bultens brottgräns
40 kgf/mm
2
(56 000 psi)
2) Åtdragningstid
Längre åtdragningstid ger ökat åtdrag-
ningsmoment. Överdriven åtdragning
inner dock ingen förbättring utan
förkortar verktygets livslängd.
3) Olika bultdiametrar
Storleken bultdiametern påverkar
åtdragningsmomentet.
I allmänhet gäller att åtdragningsmo-
mentet ökar ju srre bultdiametern
är.
4) Åtdragningsförhållanden
Åtdragningsmomentet varierar, även
för samma bult, beroende klass-,
längd- och vridmomentskoefficient
(den fasta koefficient som anges av till-
verkaren vid produktion).
Åtdragningsmomentet varierar,
även med samma bultningsmaterial
(t.ex. stål), beroende materialets
ytbehandling.
Vridmomentet minskar avsevärt när
bult och mutter börjar rotera tillsam-
mans.
5) Hylsspel
Vridmomentet minskar vid använd-
ning av en sexkantig hylsa av felaktig
storlek för att dra åt en bult.
6) Avtryckare (Avtryckare med variabel
varvtalsreglering)
Åtdragningsmomentet blir lägre vid
användning med avtryckaren inte helt
intryckt.
7) Effekten av en anslutningsadapter
Åtdragningsmomentet minskar vid
anndning av en universalkoppling
eller en anslutningsadapter.
Universalkoppling
• Anslutningsadapter
VII
. TILLBEHÖR
Borrchuck
EY9HX409E
Använd denna till bits för skru-
vdragning, träborrning eller met-
allborrning med rakt skaft med en
diameter på 1,5 mm till 10 mm.
Universalkoppling (säljs separat)
Anslutningsadapter (säljs separat)
104


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