5/16-18 x 3-1/2 Stainless Steel Carriage Bolts with Hex Nuts and Flat Washers 304 Stainless Steel 18-8 Square Neck Bolts and Nuts Washers Full Thread Coarse Thread 8 Sets

About Carriage Bolts Carriage bolts are desgined with a big smooth round domed head and a square neck underneath the head. The big head helps eliminate the need for a washer and the square neck is self locking to eliminate spinning and the need for a driving tool. Carriage bolts are commonly used to fasten a wooden part to either wood or metal frame. The high quality 304 stainless steel provide perfect strength and good corrosion resistance in bad environments like high temperature cold weather and high humidity areas without the need for time consuming and costly maintenance.