Four members of the protest group Fathers 4 Justice have been convicted of public order offences and given conditional discharges.
Jason Hatch, 32, Patrick Lennon, 47, David Pyke, 48, all of Cheltenham and Mark Peacock, 31, of Bristol, appeared at North Somerset Magistrates' Court.
Bristol's Clifton Suspension Bridge was closed to traffic and pedestrians on 2 February during the protest.
The men were also ordered to pay costs of £250.
They were found guilty under Section Five of the Public Order Act of behaviour
that caused harassment, alarm or distress.
Passing sentence, District Judge Martin Brown, said: "It was unreasonable of you to remain on the bridge for so long.
"It follows that the irresponsible attitude expressed by the defendants infringed on the rights of others."
The four accepted that they had taken part in the demonstration, but denied offences under the Public Order Act.