This is the most popular style of eye bolt we sell, and it's the standard by which other machinery eye bolts are measured. The S-279 is made from forged steel, Quenched and Tempered. They are fatigue rated at 1-1/2 times the Working Load Limit (ratings are for in-line pulls only, capacities are reduced with angular loads). These eye bolts also meet all requirements of ASME B30.26. Safety factor of 5:1. If you need metric threads, then check out the M-279 Metric Eye Bolts.