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111-63-81230 Back-Up Ring Fits Komatsu Models
111-63-81230 Back-Up Ring Fits Komatsu Models
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One New Aftermarket Replacement Back-Up Ring for Komatsu Construction Equipment
This metric PTFE back-up ring is a hydraulic sealing component used in Komatsu equipment hydraulic cylinders and valve assemblies. Back-up rings work alongside O-rings to prevent extrusion under high-pressure conditions, extending seal life and maintaining hydraulic system integrity. This ring is sold as an individual replacement part and is also commonly used when rebuilding Komatsu OEM seal kits.
Specifications
- Type: Metric PTFE (Polytetrafluoroethylene) Back-Up Ring
- Style: Cut/Split (C/S)
- Inner Diameter (ID): 125 mm
- Thickness: 1.25 mm
- Cross-Section Width: 2.5 mm
- Material: TFE (PTFE)
Compatible Models
Komatsu: Verify fitment by matching OEM part number 111-63-81230 to your equipment's parts manual or seal kit listing.
Replaces Part Number(s):
111-63-81230
Aftermarket Interchange Numbers
KOM-111-63-81230, KM-111-63-81230, BU-TFE-125x1.25x2.5-C/S
New aftermarket replacement part - not remanufactured, not used.



