- 5/16"-18
- Hexagon head designed to be driven by a wrench or socket
- Also called hex cap bolts, hex bolts, tap bolts or hex cap screws
- 18-8 Stainless steel hex cap screws offer protection from weather and corrosive environments
- Rust resistant in freshwater environments
- For saltwater environments use the 316 stainless steel version
A hex cap screw in smaller sizes may not have a shoulder. When a hex cap screw is fully threaded it can also be referred to as a tap bolt.