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Grade 5 Carriage Bolt: Carriage bolts stand out for their uniquely designed round head and square neck. It has the same design advantages as a low carbon carriage bolt but with significantly greater load carrying capacity. The Grade 5 carriage bolt has a medium tensile strength rating. The Grade 5 bolt can be distinguished by the 3 dashes (l) on top of the head of the bolt. The bolt is generally used in road graders, scoop shovels and heavy construction equipment. The length of a carriage bolt is determined by measuring from under the head of the bolt to the base of the threads.
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