There are drop forged eye nuts manufactured domestically by Chicago Hardware. 

These are machine eye bolts manufactured by Chicago Hardware, they are self colored, made from drop forged steel and heat treated after forging. 

These are drop forged plain eye bolts with nut, they are significantly stronger than eye bolts with wire eyes. 

These are forged steel ring eye bolts that are quenched and tempered. All bolts are hot dipped galvanized after threading. The ring diameter is the same as the shank diameter. 

Domestically manufactured by Chicago hardware, these shoulder eye bolts with lag screw thread are drop forged, heat treated steel with a hot galvanized finish. The lag screw thread has a tapered yet sharp end that is used for screwing into wood. 

These are drop forged eye bolts with a shoulder and nut, they are significantly stronger than eye bolts with wire eyes. The large shoulder eliminates the need for a washer under the eye.