Hardened steel piston wear ring for Komatsu 150mm (5.91") hydraulic cylinders — restores concentric piston travel and prevents side-loading damage to seals.

Replacement wear band for the piston-to-bore interface on boom, arm, or bucket cylinders. Manufactured to OEM dimensions and hardness for proper press-fit and long service life.

Specifications:
- Material: Hardened steel (HRC 58–62)
- Bore size matched to OEM
- Width matched to OEM
- Cross-referenced to original Komatsu factory part numbers

When to replace:
- Visible scoring or wear on the existing ring
- Piston rocking or off-center contact during stroke
- Premature seal failure caused by piston mis-alignment

Fits Komatsu 150mm (5.91") cylinder series (verify bore size before ordering).

Stocked in Surrey, BC. Same-day dispatch on orders placed before 2 PM PST.