The ratings of 6 Machinery stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Flowserve Corporation (FLS) declines this week from a C to a D. Flowserve Corporation designs, manufactures, distributes, and services industrial flow management equipment throughout the world. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of FLS stock.

Actuant Corporation Class A (ATU) experiences a ratings drop this week, going from last week’s C to a D. Actuant Corporation Class A is a global manufacturer of industrial products and systems for the energy, electrical, engineered solutions, and other industrial markets. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of ATU stock.

This is a rough week for Rexnord Corporation (RXN). The company’s rating falls to D from the previous week’s C. Rexnord Corporation manufactures highly engineered power transmission, aerospace and other precision motion technology products. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of RXN stock.

NN, Inc. (NNBR) earns a D this week, moving down from last week’s grade of C. NN, Inc. is an independent manufacturer and supplier of precision steel balls and rollers to both domestic and international anti-friction bearing manufacturers. The company also gets F’s in earnings surprise and free cash flow. For more information, get Portfolio Grader’s complete analysis of NNBR stock.

FreightCar America, Inc. (RAIL) gets weaker ratings this week as last week’s D drops to a F. FreightCar America, Inc. designs and manufactures aluminum and steel bodied railroad freight cars. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of RAIL stock.

ExOne Co. (XONE) slips from a C to a D this week. The company also gets F’s in earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of XONE 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.