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’s (TRS) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. TriMas manufactures trailer products, recreational accessories, packaging systems, energy products and industrial specialty products for the commercial, manufacturing, and consumer markets. TRS also rates an F in Portfolio Grader’s specific subcategory of Earnings Surprise. For more information, get Portfolio Grader’s complete analysis of TRS stock.

Kaydon Corporation (KDN) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a 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 stock currently has a trailing PE Ratio of 37.20. For a full analysis of KDN stock, visit Portfolio Grader.

Hurco Companies, Inc. (HURC) earns an F this week, moving down 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. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. To get an in-depth look at HURC, get Portfolio Grader’s complete analysis of HURC stock.

This is a rough week for Valmont Industries, Inc. (VMI). The company’s rating falls to F from the previous week’s D. Valmont Industries manufactures fabricated metal products and mechanized irrigation systems. As of June 13, 2014, 10.8% of outstanding Valmont Industries, Inc. shares were held short. For a full analysis of VMI stock, visit Portfolio Grader.

This week, Stanley Black & Decker, Inc.’s (SWK) rating worsens to a D from the company’s C rating a week ago. 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.

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.