Hex flange bolts are one-piece head bolts that are flat surfaced. The flange bolts eliminate the need to have a washer since the area under their heads is wide enough to evenly distribute pressure, thus helping to compensate for misaligned holes. Grade 5 hex flange bolts are used in lighter applications.
Non serrated hex flange bolts have a smooth, non-rotating washer attached that does not bite into the surface it's being mounted to. Their large bearing...
Serrated hex flange bolts have serrated washers attached that distribute pressure and are able to provide sufficient grip onto the material it is being...