This week, the ratings of 3 Machinery stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Key Technology, Inc. (KTEC) experiences a ratings drop this week, going from last week’s C to a D. Key Technology, Inc. designs, manufactures, sells, and services process automation systems for the food processing industry and other industries such as tobacco, plastics, and pharmaceuticals. For more information, get Portfolio Grader’s complete analysis of KTEC stock.

This is a rough week for Harsco Corporation (HSC). The company’s rating falls to D from the previous week’s C. Harsco Corporation is an industrial services and engineered products company. The company also gets F’s in sales growth, operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of HSC stock.

This week, Manitex International, Inc.’s (MNTX) rating worsens to a D from the company’s C rating a week ago. Manitex International, Inc. designs, develops and builds integrated production-line assembly and testing equipment for the automotive and heavy equipment industries. The company also gets F’s in operating margin growth, earnings growth, and earnings revisions. For more information, get Portfolio Grader’s complete analysis of MNTX 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.