This week, 6 Machinery stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

This is a strong week for Cummins Inc. (CMI). The company’s rating climbs to B from the previous week’s C. Cummins Inc. designs, manufactures, distributes and services diesel and natural gas engines, electric power generation systems, and engine-related component products. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of CMI stock.

The rating of Caterpillar Inc. (CAT) moves up this week, rising from a C to a B. Caterpillar Inc. provides construction and mining equipment, diesel and natural gas engines, and industrial gas turbines. For more information, get Portfolio Grader’s complete analysis of CAT stock.

Deere & Company (DE) shows solid improvement this week. The company’s rating rises from a C to a B. Deere & Company provides products and services for various outdoor markets, including agriculture, forestry, construction, lawn and turf care, landscaping and irrigation. The company also gets A’s in earnings revisions, earnings surprise, and return on equity. For more information, get Portfolio Grader’s complete analysis of DE stock.

Lydall, Inc. (LDL) boosts its rating from a B to a A this week. Lydall, Inc. develops and manufactures engineered materials for a variety of applications. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of LDL stock.

Altra Industrial Motion Corp. (AIMC) is seeing ratings go up from a C last week to a B this week. 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 return on equity. For more information, get Portfolio Grader’s complete analysis of AIMC stock.

This week, Navistar International Corporation’s (NAV) ratings are up from a C last week to a B. Navistar International Corporation manufactures and markets medium and heavy trucks, school buses, mid-range diesel engines, and service parts. For more information, get Portfolio Grader’s complete analysis of NAV 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.