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

TriMas Corporation (TRS) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. 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. At $33.84, the stock is below the 50-day moving average of $34.37. For a full analysis of TRS stock, visit Portfolio Grader.

This week, Stanley Black & Decker, Inc. (SWK) drops from a C to a D rating. Stanley Black & Decker is a worldwide supplier of tools and engineered solutions for professional, industrial, construction and do-it-yourself use. The stock has a trailing PE Ratio of 26.40. For more information, get Portfolio Grader’s complete analysis of SWK stock.

Valmont Industries, Inc. (VMI) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). Valmont Industries manufactures fabricated metal products and mechanized irrigation systems. As of April 4, 2014, 12% of outstanding Valmont Industries, Inc. shares were held short. To get an in-depth look at VMI, get Portfolio Grader’s complete analysis of VMI stock.

This week, Kaydon Corporation’s (KDN) rating worsens to an F from the company’s D rating a week ago. Kaydon designs, manufactures, and sells custom-engineered products for a variety of industries, including aerospace, defense, and industrial. In Earnings Growth, Earnings Momentum, Cash Flow and Margin Growth the stock gets F’s. The trailing PE Ratio for the stock is 37.20. For a full analysis of KDN stock, visit Portfolio Grader.

Hurco Companies, Inc. (HURC) is having a tough week. The company’s rating falls from a D to an F. Hurco Companies designs and produces interactive computer controls, software, and computerized machine systems for the worldwide metal cutting and metal forming industry. To get an in-depth look at HURC, 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.