UNS S31803 Bolts are a form of threaded fasteners which have an external male thread. Generally, similar to screws, an Alloy S31803 Bolt tends to use a wide variety of head designs. The heads of these bolts have been designed in such a way that it engages with the tool used to tighten them. Some stainless steel S31803 hex Bolt heads instead are able to lock the bolt in place, which would mean that this bolt does not move and a tool is only required for the nut end. Common kinds of bolt heads include hex, slotted hex washer, as well as the socket cap. The duplex grade stainless steel UNS S31803 Hex Head Bolt is available with a hexagonal head and threaded body. Many times the section that comes immediately under head may or may not be threaded depending on the bolt which has been selected.