Hex Cap Screws
Hex Cap Screws are very common in OEM markets as well as construction and other industries. The most common is made out of low carbon steel in a Grade 2, 5 and 8 for US measurements. In the Metric system there are grade 8.8, 10.9 and 12. Finishes vary for these screws but the most common is zinc.
The Hex Cap Screw could be listed under the bolt Category as well because they are bolts, yet also called screws. There is a bolt which looks a lot like the Hex Cap screw is the Hex Bolts. Hex Cap screws are made of other types of materials which include: Stainless Steel, Brass, Nylon, Aluminum and a few others. The Hex Cap Screw has a washer face under the head and has a chamfered point. Different from the "Hex Bolts", (Which do not have the washer face under the head. features.
If you require RoHs Compliance, most of the items today are. But make sure you request this when needed just to be sure.