When a 12-inch press ram, 60-ton crane boom, or 5,000 psi forging cylinder goes down,
an off-the-shelf O-ring won’t save the shift—you need oversized, application-specific
sealing hardware now.
We are the Midwest’s trusted manufacturer for large-diameter hydraulic and pneumatic seals, wear rings up to 58 inches (1.5 m) OD. From single prototype runs to high-volume production, DNC has an integrated seal-and-cylinder facility delivering the heavy-duty components that keep steel mills, mining, and heavy industry moving forward.
DNC Seal Manufacturing streamlines cylinder seal and bearing manufacturing under one roof. DNC combines CNC machining with job-specific in-house quality control. Our CNC-guided lathes turn the customized seal for your application, delivering a quality, on-time product. We work with high-performance polymers and elastomers engineered for elevated temperatures, harsh fluids, and demanding duty cycles. DNC Seal Manufacturing specializes in applications where contamination, heat, and side-load present challenges that OEM assemblies cannot overcome. DNC Seal Manufacturing can deliver the quality you need for optimal production uptime.