This was 16% higher than the crude steel output of 11.62 LT in May 2015, JSW Steel said in a BSE filing.
"JSW Steel reports highest-ever monthly crude steel production for May 2016 at 13.48 lakh tonnes showing growth of 16% over the corresponding month of previous year," it said.
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The production of flat-rolled products rose 7% to 9.30 LT last month.
Long-rolled products manufacturing surged 22% at 2.98 LT in May as against 2.44 LT in the same month last year.
JSW Steel, part of the diversified JSW Group, is a leading integrated steel company with an installed steel-making capacity of 18 million tonnes per annum.