The index ended the day 5.94 per cent down at 25,741.56 points as jittery investors sold off shares across all sectors including energy, banking, auto, IT, infrastructure and real estate.
This is the weakest closing for the Sensex since August 11, 2014, when it closed at 25,519.24.
The barometer has now retreated by 2,190.08 in three straight sessions.
The broader NSE Nifty cracked below the 7,900-mark by tanking 490.95 points, or 5.92 per cent, to 7,809 at close.
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Brokers put down the massive fall to the meltdown in global markets, with Asian bourses ending in deep red. Shanghai shares closed 8.49 per cent down while European markets were weaker by close to 3 per cent in early trade as slowdown in China stoked concerns about the health of its economy and rattled investors.
Global crude oil too went below the USD 40 per barrel mark amid weak Chinese manufacturing growth and global oversupply.
In the forex market, the rupee crashed below the crucial 66 mark by falling 90 paise to close at a two-year low of 66.73 against the dollar (intra-day) due to heavy demand for the US currency from importers and some banks.
Foreign portfolio investors net sold shares worth Rs 2,340.60 crore on Friday, as per provisional data.