This week, 4 Machinery stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

RBC Bearings Incorporated (ROLL) improves from a C to a B rating this week. RBC Bearings Incorporated designs, manufactures, and markets a broad portfolio of bearing products, including precision plain, roller, and ball bearings. The company also gets A’s in sales growth. For more information, get Portfolio Grader’s complete analysis of ROLL stock.

Crane Co. (CR) gets a higher grade this week, advancing from a C last week to a B. Crane Co. manufactures engineered industrial products for the aerospace and electronics, engineered materials, merchandising systems, fluid handling, and controls sectors. The company also gets A’s in operating margin growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CR stock.

Woodward, Inc (WWD) earns a B this week, jumping up from last week’s grade of C. 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.

Omega Flex, Inc. (OFLX) boosts its rating from a C to a B this week. 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.

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.