The overall ratings of 12 machinery stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, EnPro Industries, Inc. (NPO) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Enpro Industries designs, develops, manufactures, and markets proprietary engineered industrial products. NPO also rates an F in Portfolio Grader’s specific subcategory of Earnings Surprise. The stock has a trailing PE Ratio of 66.40. To get an in-depth look at NPO, get Portfolio Grader’s complete analysis of NPO 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 stock’s trailing PE Ratio is 37.20. For more information, get Portfolio Grader’s complete analysis of KDN stock.

The rating of Xylem Inc. (XYL) declines this week from a C to a D. Xylem engages in the design, manufacturing, and application of technologies for the water industry. To get an in-depth look at XYL, get Portfolio Grader’s complete analysis of XYL stock.

Proto Labs, Inc. (PRLB) experiences a ratings drop this week, going from last week’s C to a D. Proto Labs manufactures online and technology-enabled computer numerical control machined and injection molded parts. As of Jan. 23, 2015, 16.1% of outstanding Proto Labs, Inc. shares were held short. The stock has a trailing PE Ratio of 41.60. For more information, get Portfolio Grader’s complete analysis of PRLB stock.

Valmont Industries, Inc. (VMI) earns an F this week, moving down from last week’s grade of D. Valmont Industries manufactures fabricated metal products and mechanized irrigation systems. The stock gets F’s in Earnings Growth and Earnings Surprise. As of Jan. 23, 2015, 18% 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.

Caterpillar (CAT) gets weaker ratings this week as last week’s C drops to a D. Caterpillar provides construction and mining equipment, diesel and natural gas engines, and industrial gas turbines. For more information, get Portfolio Grader’s complete analysis of CAT stock.

This week, Graco (GGG) drops from a C to a D rating. Graco supplies technology for the management of fluids in both industrial and commercial applications. To get an in-depth look at GGG, get Portfolio Grader’s complete analysis of GGG stock.

WOODWARD, INC. (WWD) is having a tough week. The company’s rating falls from a C to a D. Woodward designs, manufactures, and services energy control systems and components for aircraft and industrial engines and turbines. For more information, get Portfolio Grader’s complete analysis of WWD stock.

Slipping from a C to a D rating, Barnes Group (B) takes a hit this week. Barnes Group is an international logistical services company and a manufacturer of aerospace and industrial components. To get an in-depth look at B, get Portfolio Grader’s complete analysis of B stock.

Crane (CR) is having a tough week. The company’s rating falls from a D to an F. Crane manufactures engineered industrial products for the aerospace and electronics, engineered materials, merchandising systems, fluid handling, and controls sectors. The stock also gets an F in Earnings Growth. For more information, get Portfolio Grader’s complete analysis of CR stock.

Slipping from a C to a D rating, IDEX Corporation (IEX) takes a hit this week. Idex designs, manufactures, and markets a variety of pump products, dispensing equipment, and other engineered products. The stock also gets an F in Earnings Momentum. To get an in-depth look at IEX, get Portfolio Grader’s complete analysis of IEX stock.

CIRCOR International, Inc. (CIR) gets weaker ratings this week as last week’s D drops to an F. CIRCOR designs, manufactures, and markets highly-engineered products, such as valves, that control the flow of fluids safely and efficiently in the energy, aerospace, and industrial markets. The stock also rates an F in Sales Growth. For more information, get Portfolio Grader’s complete analysis of CIR 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.