The 50-issue index regained the 7,800-level for the second time this month by surging 41.35 points, or 0.53 percent, to trade at an all-time high of 7,809.20, surpassing its previous intra-day high of 7,808.85 touched on July 8.
Brokers said market sentiments were upbeat on sustained capital inflows and widespread buying by retail investors after several bluechip companies came out with better-than-expected first quarter earnings.
Besides, progress of monsoon, positive economic data and global cues buoyed the trading sentiments, they said.
Major gainers which supported the Nifty to scale lifetime high were Infosys, Bank of Baroda, Reliance, GAIL, Sun Pharma and Jindal Steel. Further, a firm trend at other Asian bourses influenced the trading sentiments here, they said.
The benchmark BSE Sensex also climbed 162.84 points, or 0.62 percent, to trade at 26,188.64, just shying away from its lifetime high of 26,190.44 reached on July 8. The gauge had rallied nearly 1,019 points in previous six sessions.
Meanwhile, foreign portfolio investors (FPIs) bought shares worth a net Rs 412.03 crore on Tuesday, as per provisional data from the stock exchanges. Among other Asian markets, Hong Kong's Hang Seng was up 0.66 percent while Japan's Nikkei rose 0.16 percent in early trade.

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