This week, the overall grades of three Machinery stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Rexnord Corp (NYSE:RXN) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Rexnord Corp. manufactures highly engineered power transmission, aerospace and other precision motion technology products. It operates through two platforms: Process & Motion Control and Water Management. The Process & Motion Control platform designs, manufactures, markets and services specified, hi… The stock price has dropped 11.1% over the past month, worse than the 2.5% increase the S&P 500 has seen over the same period of time. The stock has a trailing PE Ratio of 54.90. For a full analysis of RXN stock, visit Portfolio Grader.

Caterpillar (NYSE:CAT) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). Caterpillar provides construction and mining equipment, diesel and natural gas engines, and industrial gas turbines. The stock also gets an F in Earnings Surprise. To get an in-depth look at CAT, get Portfolio Grader’s complete analysis of CAT stock.

This is a rough week for Kaydon Corp. (NYSE:KDN). The company’s rating falls to F from the previous week’s D. Kaydon designs, manufactures, and sells custom-engineered products for a variety of industries, including aerospace, defense, and industrial. The stock gets F’s in Earnings Growth, Earnings Momentum, Cash Flow, and Margin Growth. For more information, get Portfolio Grader’s complete analysis of KDN 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.