The Blitzboks will play Fiji for the gold medal at the Commonwealth Games sevens on Sunday evening after they beat Australia 24-12 in their semi-final clash.
Australia opened the scoring when Mark Nawaqanitawase crossed over in the left-hand corner for an unconverted try and an early 5-0 lead.
The Blitzboks hit back in the 5th minute as Angelo Davids collected a clever kick ahead into to score.
Ronald Brown converted as South Africa led 7-5.
Some impressive handling and interplay by Australia saw them hit straight back immediately as Matt Gonazlez cruised over for a converted try with a minute left in the half to give them a 12-7 lead.
The Blitzboks, however, weren't done for the half and Angelo Davids scored out wide in injury time after Australia were reduced to six men following a yellow card.
Brown couldn't add the conversion as the teams went into the break deadlocked at 12-all.
Selvyn Davids drew first blood for the Blitzboks in the second half as he pounced on an Australian handling error to speed away from the defence and score.
Brown added a difficult conversion as South Africa's lead moved out to 19-12 with five minutes left.
Angelo Davids put the game to bed with under two minutes left on the clock as he beat a defender to score his hat-trick try.
Brown couldn't add the conversion, but with a 24-12 lead, Neil Powell's men had done enough.
The gold medal final against Fiji takes place at 22:04 (SA time).