Hastings Rings 2M5538S-010 .010 Oversize Moly Piston Ring Set for 4.0-Inch Bore

Moly piston ring set is for 4.0 inch bore and is .010 oversize . Set includes two 1/16 inch compression rings and one 3.0mm oil ring.

The Hastings Rings 2M5538S-010 piston ring set is designed for applications using a 4.0-inch bore with a .010-inch oversize piston. This moly ring set helps support reliable cylinder sealing, efficient oil control, and consistent engine performance in compatible 95-inch Big Bore Twin Cam applications. It is a practical replacement solution for engine rebuilding, restoration, and performance service work.
The set includes two 1/16-inch compression rings and one 3.0 mm oil ring. The compression rings help maintain combustion pressure while limiting blow-by, and the oil ring is designed to manage oil on the cylinder wall for dependable lubrication control. Verify piston, groove, bore, and ring specifications before installation to ensure proper compatibility and fit.
Manufactured by Hastings Rings, part number 2M5538S-010, this piston ring set is supplied as a complete set for one compatible application. The product is sold as a set and is made in the USA. Follow the engine manufacturer’s installation procedures, including correct ring orientation, end-gap verification, and break-in recommendations, for best results.

Features:

• Brand: Hastings Rings

• Part Number: 2M5538S-010

• Application: 95-inch Big Bore Twin Cam piston ring set

• Bore Size: 4.0 inches

• Oversize: .010 inch

• Ring Material: Moly

• Compression Rings: Two 1/16-inch rings

• Oil Ring: One 3.0 mm ring

• Unit of Measure: Set

• Country of Origin: USA

• Accessory Items: None