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. For a full analysis of TRS stock, visit Portfolio Grader.

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

Kaydon Corporation (KDN) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). 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 trailing PE Ratio for the stock is 37.20. To get an in-depth look at KDN, get Portfolio Grader’s complete analysis of KDN stock.

Hurco Companies, Inc. (HURC) gets weaker ratings this week as last week’s D drops 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. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For a full analysis of HURC stock, visit Portfolio Grader.

Valmont Industries, Inc. (VMI) is having a tough week. The company’s rating falls from a D to an F. Valmont Industries manufactures fabricated metal products and mechanized irrigation systems. As of June 6, 2014, 11.2% 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.

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.