Mumbai, Sep 8 (IANS): After a volatile day of trade, key Indian equity indices provisionally closed on a flat note -- marginally in the green -- on Friday, buoyed by good buying activities in capital goods stocks.

However, heavy selling pressure in index heavyweights like Dr. Reddy's Lab, Mahindra and Mahindra, Bajaj Auto and Sun Pharma, among others, capped gains.

The wider 51-scrip Nifty50 of the National Stock Exchange (NSE) was up 4.90 points, or 0.05 per cent, to provisionally close (at 3.30 p.m.) at 9,934.80 points.

The 30-scrip Sensitive Index (Sensex) of the BSE, which opened at 31,694.15 points, closed at 31,687.52 points -- up 24.78 points, or 0.08 per cent, from its previous close at 31,662.74 points.

The Sensex touched a high of 31,763.70 points and a low of 31,619 points during intra-day trade.

However, the BSE market breadth was bearish -- with 1,509 declines and 1,102 advances.

On Thursday, the benchmark indices closed on a flat note. The Nifty50 was up 13.70 points, or 0.14 per cent, to close at 9,929.90 points, while the Sensex closed at 31,662.74 points -- fractionally up 0.77 points.