Jam nuts have a low profile and are often used on top of a standard nut to lock the first nut into place
            
        
            | Type | Nut | 
| Style | Hex Jam | 
| Size | 5/16"-18 | 
| Material | Carbon Steel | 
| Grade/Class | 5 | 
| Thread Direction | Right | 
| Thread Type | USS / UNC (Coarse) | 
| Height | 3/16" | 
| Wrench Size | 1/2" | 
 
                          
                 
                 
                 
                 
                