The ratings of 3 Machinery stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This is a rough week for Westinghouse Air Brake Technologies Corporation (WAB). The company’s rating falls to D from the previous week’s C. Westinghouse Air Brake Technologies Corporation is a provider of value-added, technology-based products and services for the global rail industry. For more information, get Portfolio Grader’s complete analysis of WAB stock.

Slipping from a D to a F rating, Lindsay Corporation (LNN) takes a hit this week. Lindsay Corporation manufactures and markets center pivot and lateral move irrigation equipment, as well as large diameter steel tubing, for use to irrigate agricultural crops. The company also gets F’s in sales growth, earnings growth, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of LNN stock.

Nordson Corporation (NDSN) is having a tough week. The company’s rating falls from a C to a D. Nordson Corporation designs, manufactures, and markets systems that apply adhesives, sealants, and coatings to consumer and industrial products during manufacturing operations. For more information, get Portfolio Grader’s complete analysis of NDSN 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.