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

This week, TriMas Corporation (TRS) falls to a D (“sell”), worse than last week’s grade of C (“hold”). TriMas manufactures trailer products, recreational accessories, packaging systems, energy products and industrial specialty products for the commercial, manufacturing, and consumer markets. For Portfolio Grader’s specific subcategory of Earnings Surprise, TRS also gets an F. The stock price has dropped 8.3% over the past month, worse than the 1.3% decrease the Nasdaq has seen over the same period of time. For a full analysis of TRS stock, visit Portfolio Grader.

Stanley Black & Decker, Inc. (SWK) earns a D this week, moving down from last week’s grade of C. Stanley Black & Decker is a worldwide supplier of tools and engineered solutions for professional, industrial, construction and do-it-yourself use. The stock’s trailing PE Ratio is 26.40. To get an in-depth look at SWK, get Portfolio Grader’s complete analysis of SWK stock.

Valmont Industries, Inc.’s (VMI) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Valmont Industries manufactures fabricated metal products and mechanized irrigation systems. As of April 17, 2014, 11.8% of outstanding Valmont Industries, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of VMI stock.

The rating of Kaydon Corporation (KDN) declines this week from a D to an F. Kaydon designs, manufactures, and sells custom-engineered products for a variety of industries, including aerospace, defense, and industrial. The stock receives F’s in Earnings Growth, Earnings Momentum, Cash Flow and Margin Growth. The stock has a trailing PE Ratio of 37.20. To get an in-depth look at KDN, get Portfolio Grader’s complete analysis of KDN stock.

Hurco Companies, Inc. (HURC) earns an F this week, falling from last week’s grade of D. Hurco Companies designs and produces interactive computer controls, software, and computerized machine systems for the worldwide metal cutting and metal forming industry. For more information, get Portfolio Grader’s complete analysis of HURC 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.