Hastings Mfg Piston Rings - M8 1746 OS .010 Moly — Harley-Davidson Street Glide, Softail Fat Boy 114, Road King Special (2017-2026)

Hastings Mfg piston rings for Milwaukee-Eight V-twin engines, available in cast or moly face coatings. Three-piece oil ring design compatible with OEM and Screaming Eagle pistons, manufactured in the USA.

Features

• Available in Cast or Moly coating
• Three-piece oil ring design
• Compatible with OEM and Screaming Eagle pistons
• Made in the USA
• Set covers two pistons (except TC 113" and 883 XL — see fitment notes)

Specifications

• Brand: Hastings Mfg
• Manufacturer Part #: 2C5231.25
• Length: 5 in
• Width: 1.37 in
• Height: 5 in
• Weight: 0.21 lbs

Fitment

Designed for V-twin motorcycles including Milwaukee-Eight engines. IMPORTANT: For Twin Cam 113" and Sportster 883 XL models, rings are sold per cylinder — you must order two sets per bike. All other models receive one set (two pistons) per order.

Frequently Asked Questions

Do these rings work with aftermarket pistons?

Yes — compatible with OEM and Screaming Eagle pistons. Verify ring groove diameter matches your specific piston before installing.

What's the difference between Cast and Moly rings?

Moly-coated rings offer reduced friction and faster break-in. Cast rings are a traditional choice. Select based on your engine build and break-in plan.

How many rings do I get per order?

Most models receive one set covering two pistons. TC 113" and 883 XL buyers must order two sets — one per cylinder.

Are these OEM Harley rings?

No — Hastings Mfg manufactures these as a compatible replacement, designed to work with OEM specifications.