Description

The Cummins CM2350 Steel Crown Piston M-8620 (Standard Size) is a heavy-duty piston assembly engineered specifically for CM2350 emissions-platform diesel engines , where extreme combustion pressures and elevated exhaust temperatures demand superior piston strength. This piston is a direct replacement for OE piston numbers 5258754 and 5258755 , delivering OEM-correct fitment, durability, and long service life in Cummins diesel engines . Steel crown pistons are critical in modern common-rail diesel platforms like CM2350 due to their ability to withstand higher thermal and mechanical loads than traditional aluminum pistons. The steel crown construction resists cracking, reduces crown deformation, and supports higher cylinder pressures—making the M-8620 piston ideal for heavy-duty, emissions-controlled applications. The piston features precision-machined ring lands, controlled thermal expansion geometry, and an optimized skirt profile to reduce friction and maintain piston stability. When paired with the correct piston ring set, piston pin, bushings, and retainers, it helps restore factory compression, reduce blow-by, and control oil consumption. The Cummins M-8620 steel crown piston is commonly installed during CM2350 engine rebuilds, in-frame overhauls, piston replacements, and professional remanufacturing projects . It is trusted by diesel technicians, fleet maintenance teams, and engine builders who require OEM-level strength and reliability. Cross-Reference (OEM) Aftermarket Reference: M-8620 OEM References: 5258754, 5258755 Platform: CM2350 Size: Standard (STD) Type: Steel Crown Piston