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DIN603 Stainless Steel A4-70 SS316 Round Head Square Neck Carriage Bolts

Round Heads and Square Necks, also the less common Ribbed Neck. Available in Steel, Grade 5, Grade 8 & Stainless.
A carriage bolt, coach bolt or round head square neck bolt[1] is a form of bolt used to fasten metal to wood.
Carriage bolts were developed for use through iron strengthening plates on either side of a wooden beam. It is commonplace though to use them to bare timber, the squared section giving enough grip to prevent rotation.

Carriage bolts are extensively used in security fixings, such as the Brenton Bolt where the bolt must only be removable from one side. The smooth domed head and square nut below prevent the carriage bolt from being unlocked from the insecure side.

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