0.3125in

5/16-18 Carriage Bolts Round Head Square Neck Coach Screws Stainless Steel A carriage bolt, coach bolt or round head square neck bolt is used through iron strengthening plates on either side of a wooden beam. It is commonplace though to use them on bare timber, the squared section giving enough grip to prevent rotation. Carriage bolts are extensively used in security fixings where the bolt must only be removable from one side. The smooth domed head and square neck below prevent the carriage bolt from being unlocked from the insecure side. General Product Information Head Style : Round Thread : 5/16-18 Length : Select Length In Drop Down Quantity of Fasteners in Package : Select Package Quantity In Drop Down Detailed Product Information: Head Diameter : 0.704″ Head Height : 0.166″ Square Neck Width : 0.320″ Square Neck Height : 0.187″ Thread Diameter : 0.3125″ Threads Per Inch (TPI) : 18 Coarse or Fine Thread : Coarse Thread Coverage : Select Length To View Shipping: All orders placed before 3:30 pm EST Will Ship Same Day Tracking is provided on ALL Orders Priority Mail Shipping service is offered at a discount of only $3.95 UPS Ground UPS Next Day Air is available, Please inquire for pricing Returns : ALL returns are accepted if returned within 60 days. Money Back or exchange guaranteed. NO Restocking Fees. For YOU, we constantly strive to find ways of improving our performance.