Hastings Rings 2M5538S-020 .020 Oversize Moly Piston Ring Set for 4.0-Inch Bore

Moly piston ring set is for 4.0 inch bore and is .020 oversize . Set includes two 1/16 inch compression rings and one 3.0mm oil ring.

The Hastings Rings 2M5538S-020 piston ring set is designed for engines with a 4.0-inch bore and .020-inch oversize pistons. This moly ring set supports dependable sealing between the piston and cylinder wall, helping maintain compression and control oil within the combustion chamber. It is suited for 95-inch Big Bore Twin Cam engine applications where accurate ring selection is essential for proper rebuild performance.
The set includes two 1/16-inch compression rings and one 3.0 mm oil ring. The compression rings help seal combustion gases and support consistent cylinder pressure, while the oil ring helps regulate lubricant on the cylinder wall. Hastings Rings manufactures the 2M5538S-020 for use in compatible performance and replacement engine builds requiring a .020-inch oversize ring set.
Designed for professional engine rebuilding and maintenance, this set should be matched with the correct piston, bore specification, ring grooves, and installation requirements before assembly. Verify end gap, ring orientation, groove clearance, and cylinder preparation according to the engine manufacturer's specifications. The Hastings Rings 2M5538S-020 is supplied as one complete set and is made in the USA.

Features:

• Brand: Hastings Rings

• Part Number: 2M5538S-020

• Application: 95-inch Big Bore Twin Cam engine builds

• Bore Size: 4.0 inches

• Oversize: .020 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