MAHLE 3020112 Second Ring Set Plain Gray Iron THG 4.030 Bore 1/16 Width

The MAHLE 302-0112 is a plain second compression ring set engineered for 4.030-inch bore applications. Constructed from gray iron with a 1/16-inch edge width, this ring features MAHLE's proprietary Tapered Hook Groove (THG) second ring design — a hallmark of their performance piston ring lineup.

Key Features:

• Ring Type: Second compression ring (plain style)
• Bore Diameter: 4.0300 inches
• Edge Width: 1/16 inch
• Material: Gray iron construction
• Design: Tapered Hook Groove (THG) profile

MAHLE's Tapered Hook Groove (THG) second ring design delivers superior oil control, improved combustion gas management, enhanced top ring stability, and improved sealing. The second ring serves a dual role — handling up to 80% of oil control while contributing up to 20% of compression control. The THG profile acts as a check valve to relieve excessive combustion pressure buildup under the top ring, reducing ring flutter and maintaining a consistent combustion seal.

About MAHLE Piston Rings:

MAHLE is the world's largest piston ring manufacturer, with over a century of experience supplying Original Equipment and aftermarket applications. More than 60% of production engines built in North America use MAHLE pistons or rings, making them a trusted choice for engine rebuilders and performance enthusiasts alike.