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

Hastings Mfg piston rings in standard moly finish for Milwaukee-Eight V-twin engines. These OEM-quality rings are designed to seal combustion and manage oil control with three-piece oil ring design, made in the USA and compatible with both stock and Screaming Eagle pistons.

Features

• Moly finish reduces friction and wear
• Three-piece oil ring design
• Compatible with OEM and Screaming Eagle pistons
• Made in the USA
• Sold as a two-piston set (except TC 113" and 883 XL — see fitment

Specifications

• Brand: Hastings Mfg
• Manufacturer Part #: 2C5231
• Finish: Moly
• Ring Type: Three-piece oil rings
• Length: 5 in
• Width: 1.37 in
• Height: 5 in
• Weight: 0.2 lbs

Fitment

Fits Milwaukee-Eight V-twin motorcycles. IMPORTANT: For Twin Cam 113" and 883 XL models, these rings are sold per cylinder — you must order two sets per bike.

Frequently Asked Questions

How many rings are in one package?

One set covers two pistons for most models. TC 113" and 883 XL riders must order two sets (one per cylinder).

Will these work with Screaming Eagle pistons?

Yes — these rings are designed to work with both OEM and Screaming Eagle piston kits.

Are these compatible with stock Harley pistons?

Yes — these are direct replacements for OEM piston rings in V-twin engines.

What's the advantage of moly over cast rings?

Moly finish reduces friction and wear, improving ring life and engine efficiency compared to standard cast rings.

Do I need different rings for TC 113" or 883 XL?

Same ring design, but these models require ordering two sets because each ring set covers only one cylinder, not two.