Assenmacher Tools

About Assenmacher Tools

Assenmacher Tools, also known as Assenmacher Specialty Tools or simply AST, is a Boulder, Colorado company that designs and distributes problem-solving tools for professional automotive repair. Assenmacher Tools was founded in 1978 by Gerhard Assenmacher and has remained independently owned ever since. The company builds its catalog around the jobs that standard shop tools handle poorly, especially on European, Asian and domestic vehicles.

A Focus on Specialty Tooling

AST describes its line as specialty tools, cooling system adapters, oil change products, cam alignment tools and disconnect tools. That focus explains why technicians working on Mercedes-Benz, BMW, Volvo, Volkswagen and Audi vehicles often have a few AST pieces in the toolbox. Its reputation rests on narrow, purpose-built tools that save time on jobs where a generic wrench or socket will not fit or will damage a part.

Oil Change and Filter Service Tools

Oil service is one of the brand's strongest areas. Modern engines often use cartridge or cap-style filter housings with unusual sizes, and a close-fitting tool helps avoid rounded or cracked housings. Assenmacher Tools oil filter wrenches and oil filter sockets are made in sizes and drive styles for these applications. The range also includes drain plug tools, funnels and related oil change accessories.

Cooling System Adapters

A cooling system pressure tester only works if it seals properly against the radiator or expansion tank. Assenmacher Tools cooling system adapters are designed to connect testers and refill equipment to a wide range of makes, and replacement gaskets are available so the adapters can keep sealing after repeated use. A correct adapter helps technicians find leaks and fill the system without trapping air.

Suspension and Bearing Service

For front-end and driveline work, the catalog includes hammer nuts and stud tools used alongside ball joint tools. The hammer nuts protect thread ends when components are driven apart. Pulling jobs are covered by the brand's puller line, including bearing pullers for removing pressed-on parts without damaging shafts or housings.

Other Shop Essentials

Beyond those categories, the lineup includes:

• Bypass wrenches for tight fuel and coolant fittings
• Stud removers, installers and parts kits
• Tamper-proof Torx sockets and hex bits
• Disconnect tools for fuel and A/C fittings

Whether you maintain a fleet or work on a single enthusiast car, Assenmacher Tools offers focused solutions for jobs where the right fit matters.