Davies joined his fellow World Cup locks Luke Charteris and Alun-Wyn Jones, who are both injured, on the Six Nations sidelines.
Cardiff Blues forward Davies, subject to any successful appeal, cannot play again until March 26 - nine days after the competition finishes.
The punishment, which would have been considerably longer had it not been for various mitigating factors, follows his citing for a reckless tip-tackle on Ireland replacement Donncha Ryan during last Sunday's Six Nations clash in Dublin.
Davies, 25, was reported by match commissioner, Italian Achille Reali, following the second-half incident at the Aviva Stadium.
Top English referee Wayne Barnes brandished a yellow card on the recommendation of his assistant Dave Pearson, but television replays revealed the full extent of Davies' actions, which should have undoubtedly warranted a straight red.
Even Wales coach Warren Gatland admitted that Davies was fortunate to avoid being sent off, so his suspension should come as no surprise to a Welsh camp currently preparing for next Sunday's Six Nations appointment with Scotland in Cardiff.
Gatland will announce his team to face the Scots on Thursday afternoon, with former captain and back-row regular Ryan Jones widely expected to take Davies' number four shirt.
Jones, who starred at blindside flanker against Ireland, has played lock for his regional team the Ospreys this season, and would be the obvious replacement for Davies, although Gatland also has uncapped Scarlets second-row Lou Reed in the Six Nations squad.
"Ryan Jones has been on top of his game as a second-row and back-row for the Ospreys, and we are really happy with the way he is playing at the moment," Wales forwards coach Robin McBryde said, speaking prior to Davies' ban being announced.
"We have that option, even if it would not give him as much freedom to run around the field carrying the ball as he did so well on Sunday.
"And we have Lou, an up-and-coming second-row who was with us at our training camp in Poland and has plenty to offer. He does not look out of place and he is fitting in well, taking a lot on board.
"We know we can turn to him, and we also have Aaron Shingler, who covers the back five for the Scarlets. We are not looking to add someone to the squad at this stage.
"We are keeping a close eye on Alun-Wyn Jones, whose rehab at Ospreys is going very well. He might have a bit of involvement at the weekend (for the Ospreys), and we are monitoring Luke, but he is a little further behind than Alun-Wyn.
"We are ready for whatever eventuality."
A three-man disciplinary panel decided that Davies' offence merited a top-end entry point of a 10-week ban, with an additional two weeks applied for this type of foul play.
But mitigating factors - Davies' guilty plea, his previously good disciplinary record and his conduct at the hearing - saw a maximum reduction to the punishment of five weeks imposed.
The Six Nations disciplinary committee, chaired by Antony Davies (England) along with John Doubleday (England) and Jean-Noel Couraud (France), considered the citing report, television footage and listened to Davies' explanation.
In a statement, the Six Nations said: "They (the committee) found that the incident in which the player lifted his opponent beyond a horizontal position but did not bring him to the ground safely contrary to Law 10.4(j) and the IRB's (International Rugby Board's) particular emphasis on this aspect of the game, merited a top end entry to the IRB's table of sanctions.
"The committee applied an additional two weeks to the entry point of 10 weeks to reflect the need for a deterrent for this type of foul play.
"But, in mitigation, took account of various factors in the player's favour, including his admission of guilt, his previous good disciplinary record and his conduct at the hearing in allowing the maximum possible reduction of five weeks.
"Bradley Davies can resume playing on 26 March 2012, and has the right of appeal."
Davies, who has won 33 caps and made his Test debut against Scotland in 2009, will be available for Cardiff Blues' Heineken Cup quarter-final against holders Leinster on April 7.
But that will be of little comfort to him at the moment as he reflects on an episode that could easily have cost Wales victory in Dublin instead of them trooping off as 23-21 winners.
Davies is the second Wales player to be suspended for a tip-tackle this season following skipper Sam Warburton's dismissal during the World Cup last autumn.
Warburton was red-carded by Irish official Alain Rolland for a tackle on France wing Vincent Clerc during the World Cup semi-final in Auckland, an offence that saw him receive a three-week ban.
Warburton, meanwhile, did not train today after suffering a dead leg that forced him off at half-time against Ireland.
McBryde added: "Sam needs a bit more time. The signs are looking good, and the medical team are confident he will be able to take a full part in training on Friday."
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