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Duro Purlins and
Duro Girts are
pre-punched with
standard
18mmx22mm
elongated or
14mm diameter
holes to fit M12
bolts. If
greater strength
bolts are
desired where
stress may
exceed the load
threshold of two
M12 Grade 4.6
bolts, then M12
Grade 8.8 bolts
are recommended.
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