We are curious about what makes each bolt unique. We want to help you become more knowledgeable about bolts, threads & fasteners! Each bolt has its own special markings to make it easy to identify.
For instance, did you know that bolt heads have different identifications?
- 3 lines- Gr. 5 bolts
- 6 lines-Gr. 8 bolts
- 10.9- metric bolts (equivalent to Gr. 8 bolts)
- 8.8- metric bolts (equivalent to Gr. 5 bolts)