Used Sunnen CNC Machines & Tool Room Equipment for Sale

Sunnen Products Company was established in St. Louis, Missouri in 1924 by Joseph Sunnen, who had patented his first tool — an adjustable valve lifter — the year before while working in his brother's auto garage. By 1928, Joe had developed and patented the first manual cylinder hone, setting the company on a course that would make it the global leader in precision bore sizing and finishing. After nearly a century as a family-run business, Sunnen was acquired by private equity firm P4G Capital Management in December 2023, while maintaining its St. Louis headquarters and commitment to American manufacturing.

Sunnen's flagship product lines center on horizontal and vertical precision honing machines. The long-running MBB Series — including the widely used MBB-1660 — delivers versatile manual-stroke bore sizing for job shops and production environments alike. The power-stroked SSH and SH Series (SH-2000, SH-4000, SH-5000, and SH-6000 Krossgrinding machines) step up to servo-controlled, touchscreen-equipped platforms suited for medium-to-high-volume production. Vertical honing is covered by the SV-35 and SV-3000 Series, which bring servo spindle and servo stroke control to cylinder and bore finishing. Across all lines, Sunnen manufactures its own matched tooling, mandrels, abrasives, and honing fluids, making it a fully integrated single-source supplier.

Sunnen honing machines are found across a broad spectrum of precision manufacturing industries. Automotive OEMs and engine rebuilders rely on them for cylinder bores, connecting rods, and transmission components. Aerospace and defense manufacturers use Sunnen equipment to hold ultra-tight tolerances on hydraulic actuators, flight control valves, and firearm components. The medical device sector depends on Sunnen hones for orthopedic implants and surgical instruments, while energy, hydraulics, diesel engine, and general job-shop customers round out the company's global customer base.

Used Sunnen honing machines remain in strong demand on the secondary market for several compelling reasons. The machines are built to exacting standards with heavy-duty castings and precision spindle systems that hold tolerances reliably for decades of service. Sunnen's vertically integrated model means replacement tooling, mandrels, abrasives, and wear parts remain available directly from the manufacturer, reducing downtime risk on older equipment. The MBB-1660 in particular has earned a reputation as one of the most durable and adaptable horizontal hones ever made, with examples from the 1970s and 1980s still found in active production shops. Buyers seeking a cost-effective entry into precision bore finishing consistently turn to used Sunnen equipment for its proven accuracy, broad bore-size range, and the manufacturer's ongoing application support.

Meadoworks is your trusted source for used Sunnen equipment. As third-generation industrial equipment dealers and AMEA-certified appraisers with over 50 years of experience, we offer quality-inspected Sunnen machines at competitive prices. Browse the 2 used Sunnen machines listed above, or call 800-323-0307 for equipment not yet listed.

Every machine includes detailed specifications and high-resolution photos, and inspection visits are available for most equipment. We ship worldwide with experienced rigging partners and offer financing for qualified buyers. Have Sunnen equipment to sell? Get a free valuation or contact our team.