4 Machinery stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

American Railcar Industries, Inc. (ARII) earns a B this week, jumping up from last week’s grade of C. American Railcar Industries, Inc. designs, manufactures, and sells hopper and tank railcars in North America. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of ARII stock.

Omega Flex, Inc. (OFLX) shows solid improvement this week. The company’s rating rises from a C to a B. Omega Flex, Inc. manufactures flexible metal hose. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of OFLX stock.

This week, Briggs & Stratton Corporation’s (BGG) ratings are up from a C last week to a B. Briggs & Stratton Corporation produces air-cooled gasoline engines for outdoor power equipment, in addition to designing, manufacturing, marketing and servicing these products for original equipment manufacturers worldwide. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of BGG stock.

Wabash National Corporation (WNC) is seeing ratings go up from a C last week to a B this week. Wabash National Corporation designs, manufactures and markets standard and customized truck trailers and intermodal equipment. The company also gets A’s in operating margin growth, earnings growth, earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of WNC 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.