How much weight can a pull-up bar actually hold?

Manufacturer ratings of 300-600 lbs are common, but reviewers and specialist subreddits stress that the bottleneck is almost always the mounting surface, not the bar itself. A wall-mounted bar is only as strong as the studs and lag bolts behind it; a doorway bar depends on the trim and frame. For kipping pull-ups, muscle-ups, or users above ~250 lbs, the consensus across the threads we read is to go wall- or ceiling-mounted into solid lumber, not doorway.