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”).

Hurco Companies, Inc. (HURC) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). 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.

Kaydon Corporation (KDN) gets weaker ratings this week as last week’s D drops to an F. 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 stock has a trailing PE Ratio of 37.20. For more information, get Portfolio Grader’s complete analysis of KDN stock.

Valmont Industries, Inc.’s (VMI) rating weakens this week, dropping to an F versus last week’s D. Valmont Industries manufactures fabricated metal products and mechanized irrigation systems. As of Nov. 28, 2014, 20.9% 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.

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. The stock also rates an F in Earnings Surprise. For more information, get Portfolio Grader’s complete analysis of TRS stock.

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. To get an in-depth look at SWK, 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.