Piston Ring Set 4.165 1.2 1.2 3.0mm

The Hastings Piston Ring Set 4.165 1.2 1.2 3.0mm (SKU: HASSN9050040) is a premium eight-cylinder piston ring kit engineered for engines with a 4.165-inch bore diameter. This drop-in ring set combines ductile iron and steel construction with gas nitriding surface treatment to deliver consistent compression sealing and extended service life in high-performance and rebuild applications. The three-piece design—featuring 1.2mm compression rings and a 3.0mm oil ring—represents Hastings' proven formula for balancing blowby control with ring stability across a wide operating temperature range.

Specification-driven performance begins with the 1.2 x 1.2 x 3.0mm ring profile, which optimizes the balance between sealing pressure and minimal friction loss. The gas nitriding process hardens the ring face to resist scuffing and corrosion, a critical factor in maintaining cylinder wall integrity during sustained operation. Standard tension rating ensures reliable sealing without excessive side thrust, reducing wear on piston grooves and bore surfaces. Stainless steel ring construction resists oxidation and maintains dimensional stability, particularly important in engines exposed to moisture or thermal cycling.

This piston ring kit serves rebuild shops, engine builders, and fleet maintenance operations working with eight-cylinder engines requiring OEM-equivalent or superior ring performance. Applications span automotive rebuilds, marine engine overhauls, and industrial power units where bore specifications call for a 4.165-inch diameter. The kit's drop-in design simplifies installation and ensures compatibility with standard piston groove configurations. Buyers seeking a Hastings piston ring set for their 4.165-bore rebuild will find this component delivers the durability and sealing reliability that premium ring sets demand.