The dead man had no identification but was believed to be African.
A resident of the housing area found the man in a back lane at about 8.30pm on Friday. Kajang police chief Othman Nanyan said the man had been attacked with a parang.
A witness told police that three men had chased the victim and hacked him. Two of the weapons were recovered from a drain and another about 10m away. A car, believed to be the victim’s, was parked about 100m away.
The five suspects, aged 20 to 28, were picked up last night.