MAHLE 3021204 Piston Ring Set Steel Napier Bore - 4.000 1.5mm

The MAHLE 3021204 is a premium piston ring set engineered for heavy-duty diesel and industrial applications requiring 4.000-inch bore diameter cylinders. This set features steel Napier-style compression rings with a 1.5mm radial width and a .151-inch (3.835mm) rectangular wall thickness, designed to provide superior sealing and durability in demanding operating conditions.

Key Specifications:

• Bore diameter: 4.000 inches (101.6mm)
• Ring radial width: 1.5mm
• Ring wall thickness: .151 inches
• Construction: High-strength steel
• Profile: Napier (THM - tapered hook machined) design
• Finish: Plain (uncoated) ring set

Features and Benefits:

• Napier design provides enhanced oil control and reduced friction
• Steel construction offers excellent wear resistance and thermal stability
• Precision-machined to exact tolerances for optimal cylinder sealing
• Plain finish suitable for cast iron cylinder applications
• MAHLE OE-quality manufacturing for reliable performance

MAHLE is a globally recognized manufacturer of engine components, known for producing OEM-quality piston rings that meet or exceed original equipment specifications. This ring set is ideal for engine rebuilds, restorations, and performance applications where durability and precise fitment are critical.