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”).

Snap-on Incorporated (SNA) slips from a C to a D this week. Snap-on Incorporated conceives, manufactures, and markets of tools, diagnostics, equipment, software, and service solutions for professional clients. For more information, get Portfolio Grader’s complete analysis of SNA stock.

This week, FreightCar America, Inc.’s (RAIL) rating worsens to a D from the company’s C rating a week ago. FreightCar America, Inc. designs and manufactures aluminum and steel bodied railroad freight cars. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of RAIL stock.

Navistar International Corporation (NAV) gets weaker ratings this week as last week’s C drops to a D. Navistar International Corporation manufactures and markets medium and heavy trucks, school buses, mid-range diesel engines, and service parts. The company also gets F’s in sales growth, earnings revisions, and free cash flow. For more information, get Portfolio Grader’s complete analysis of NAV stock.

L.S. Starrett Company Class A (SCX) experiences a ratings drop this week, going from last week’s D to a F. L.S. Starrett Company Class A manufactures products, including tools and blades, for industrial, professional and consumer markets. The company also gets F’s in sales growth, operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SCX stock.

Manitex International, Inc. (MNTX) declines this week from a B to a D. Manitex International, Inc. designs, develops and builds integrated production-line assembly and testing equipment for the automotive and heavy equipment industries. The company also gets F’s in operating margin growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of MNTX stock.

Jason Industries, Inc.’s (JASN) rating weakens this week, dropping to a F versus last week’s D. The company also gets F’s in earnings revisions, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of JASN 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.