Klein Tools, Inc.

Klein Tools, Inc., commonly known as Klein Tools, is a privately owned, family-operated American manufacturer of hand tools. Founded in 1857 in Chicago, Illinois, the company's corporate headquarters are located in Lincolnshire, IL, with facilities in other U.S. states including Texas. The company is a significant enterprise, with reported employee counts ranging from over 1,000 to approximately 2,500. Revenue estimates vary, with some sources indicating over a billion dollars in annual revenue.

Klein Tools designs, develops, manufactures, and sells a comprehensive range of professional-grade hand tools, primarily for the electrical, telecommunications, and construction industries. Their extensive product catalog includes pliers (for which they are particularly well-known, with "Kleins" sometimes used generically for lineman's pliers), screwdrivers, wire pulling and stripping tools, crimping tools, multimeters, conduit benders, personal protective equipment, and tool bags. The company emphasizes American manufacturing and serves various other trades, including HVAC, plumbing, and mining.

Klein Tools is an active litigant in patent disputes, characterized as an operating company defending its intellectual property and products. The company has been involved in three tracked cases. They appeared as a plaintiff in one case before the Patent Trial and Appeal Board (PTAB) and as a defendant in two cases in the Illinois Northern District Court.

The tracked litigation primarily involves disputes with Milwaukee Electric Tool Corporation, with Klein Tools being both a plaintiff against Milwaukee Electric Tool Corporation at the PTAB (2024-05-23) and a defendant in two lawsuits brought by Milwaukee Electric Tool Corp. in the Illinois Northern District Court (2024-05-23 and 2024-06-13). This pattern suggests an active competitive posture, with both companies asserting and defending their patent rights concerning their respective tool product lines.