The grades of 3 Machinery stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

Woodward, Inc (WWD) shows solid improvement this week. The company’s rating rises from a C to a B. Woodward, Inc 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.

The rating of Altra Industrial Motion Corp. (AIMC) moves up this week, rising from a C to a B. Altra Industrial Motion Corp. designs, produces, and markets a range of mechanical power transmission and motion control products worldwide. The company also gets A’s in earnings growth and return on equity. For more information, get Portfolio Grader’s complete analysis of AIMC stock.

This week, Supreme Industries, Inc. Class A’s (STS) ratings are up from a C last week to a B. Supreme Industries, Inc. Class A is a manufacturer of specialized vehicles, including trucks, buses and armored vehicles. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of STS 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.