Prime-Line 9063020 Carriage Bolts, 5/16 In.-18 X 2-1/2 In., A307 Grade, 50 Pack Product Details Carriage bolts feature a slightly rounded head and have no exposed sharp edges when fully fastened. Due to that reason, they are often used when a more aesthetic look is desired. They are commonly used on docks and on playground equipment or in cases where it may be difficult to reach the bolt head with a tool. The square shoulder on carriage bolts help to hold it in place while the nut is fastened. Size: 5/16 inch-18 X 2-1/2 inch Features a smooth rounded head as opposed to a standard hex head Square shoulder allows for nut to be tightened or loosened Often used in cases where a protruding bolt head could cause injury Please refer to the line art drawing for dimensions and compare with your needs before ordering

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