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Description Specification Related Products (3)
APPLICATION
Used mainly for fastening timber to timber and is extensively used for timber joist construction in house building and numerous decking applications.

A carriage bolt, also known as coach bolt or as cup square hex bolts, has a domed head, and the shank is topped by a short square section under the head. The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened. A rib neck carriage bolt has several longitudinal ribs instead of the square section, to grip into a metal part being fixed.

Zinc coatings prevent oxidation of the protected metal to create a longer lasting finish. It does this by forming a barrier and by acting as a sacrificial anode if this barrier is damaged. Zinc oxide is a fine white dust that (in contrast to iron oxide) does not trigger a breakdown of the substrates surface integrity as it is formed. The zinc oxide, if left intact, can act as a barrier to further oxidation, in a way similar to the protection afforded to aluminum and stainless steels by their oxide layers.

Fastener Specifications
Head Type Cup Square Hex
Bolt Diameter 8mm
Fixing Length 65mm
Thread Length 65mm
Thread Type Metric
Thread Pitch 1.25mm
Bolt Finish Zinc Plated
Material Grade 4.6 Mild Steel
Bolt Specification DIN 603/1111
Tags: m8x65 cup square hex coach bolts zinc plated, grouped, fixings megastore, m8 coach bolts zinc plated, coach bolts, coach bolts - zinc plated