The grades of 4 Machinery stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Ingersoll-Rand Plc (IR) gets a higher grade this week, advancing from a C last week to a B. Ingersoll-Rand Plc is a diversified, global company that provides a diverse range of products and services for a wide range of industries. The company also gets A’s in operating margin growth, earnings growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of IR stock.

This week, Tennant Company’s (TNC) ratings are up from a D last week to a B. Tennant Company engages in designing, manufacturing, and marketing cleaning solutions worldwide. The company also gets A’s in earnings momentum and return on equity. For more information, get Portfolio Grader’s complete analysis of TNC stock.

Hardinge Inc.’s (HDNG) ratings are looking better this week, moving up to a B from last week’s C. Hardinge Inc. globally designs, manufactures and distributes computer controlled metal cutting lathes, grinding and related tooling and accessories. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of HDNG stock.

NF Energy Saving Corp. (NFEC) shows solid improvement this week. The company’s rating rises from a C to a B. NF Energy Saving Corp. produces heavy industrial components and products. The company also gets A’s in sales growth. For more information, get Portfolio Grader’s complete analysis of NFEC 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.