we depend on Fastenal for:
7/16" coarse grade 8 bolts (not common, but min spec for harness bolts)
9/16ths coarse thread grade 8 (common for link bushings medium duty, engine mounts)
all sizes of coarse top locks (1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 3/4, 7/8")
Everything else we get by the lb at TSC