Plow Bolts

These bolts, which are used on heavy machinery like plows, feature a flat, smooth head that is inclined underneath to fit flush into countersunk holes. When tightening a nut, their square neck prevents them from spinning. 

Compared to flat head bolts, these bolts are more resistant to wear because of their thicker, domed head. These bolts, which are used on heavy machinery like plows, are angled beneath the head so they sit almost flush in countersunk holes. When tightening a nut, their square neck prevents them from spinning. 

Bucket-tooth bolts, also called reverse-key plow screws, are bolts with a locking key that prevents them from spinning when a nut is tightened. Their smooth, flat head is inclined underneath to sit flush into countersunk holes, and they are frequently found on heavy machinery like plows.