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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 4 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 Nuts and washers not included, ensure washers and nuts are same diameter Thread Type: Coarse, Thread Class: UNC-2A, Point Style: Blunt Specification(s) Met: ASME B18.5 and ASTM A307A UPC 049793111722 ASIN B074ZNSFMZ Brand PRIME-LINE Color Zinc Model 9063153 Set Name Prime-Line 50-Piece Zinc Plated Carriage Bolt Set (5/16 in. -18 X 4 in.) Head Type Domed Size Name 5/16 in. -18 Unit Count 1 Count Part Number 9063153 Thread Size 5/16 -18 Thread Type Unc Drive System Square Finish Types Zinc Plated Grade Rating Grade A Manufacturer Prime-Line Thread Class Others Thread Style Right Hand Fastener Size 5/16 Fastener Type Carriage Bolt Item Diameter 0.31 inches Item Hardness Rockwell B70 Material Type Alloy Steel Item Type Name Carriage Bolt, 5/16 in-18 X 4 in, Zinc Plated Steel, Pack of 50 Exterior Finish Zinc Item Dimensions 4 x 4 x 6 inches Number Of Items 50 Thread Coverage Fully Threaded Number of Pieces 50 Outside Diameter 0.31 inches Screw Head Style Domed Screw Point Style Blunt Manufacturer Grade Grade A Included Components Carriage Bolt Compatible Groove Diameter 0.31 inches Global Trade Identification Number 00049793111722