This week, three Machinery stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Robbins & Myers (NYSE:RBN) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. Robbins & Myers supplies engineered equipment and systems for critical applications in global energy, industrial, chemical and pharmaceutical markets. For more information, get Portfolio Grader’s complete analysis of RBN stock.

Snap-On Inc. (NYSE:SNA) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Snap-on conceives, manufactures, and markets of tools, diagnostics, equipment, software, and service solutions for professional clients. For more information, get Portfolio Grader’s complete analysis of SNA stock.

This week, IDEX Corp. (NYSE:IEX) pushes up from a C to a B rating. Idex designs, manufactures, and markets a variety of pump products, dispensing equipment, and other engineered products. The stock price has risen 6.5% over the past month, better than the 4.8% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of IEX stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.