Part-number relationships
| Relationship | Reference family | Number |
|---|---|---|
| Primary Cat Part Number | Official O-ring identity | 8H-8257 |
| Same-number Formatting Variant | Search alias only | 8H8257 |
1 product photo · Select a thumbnail to change the main view.
Excavator Spare Parts
8H-8257 6.99 x 291.46 mm NBR O-Ring for Cat 824 834 980 988 Equipment
OEM / reference8H-8257
SpecificationNBR O-Ring Seal
Catalog ID53415478
O-ring identified by official Cat part number 8H-8257. Cat publishes a 0.275 in cross-section diameter and 11.475 in inner diameter; its official overhaul-kit record describes the same part as a 6.99 x 291.46 mm 75A NBR O-ring. Compatible equipment includes Cat 824 and 834 wheel dozers plus selected 980 and 988 wheel loaders. One selected exact owned close-up shows the physical seal without third-party branding.
Fitment status: Verified · Checked 2026-08-02- Product Type
- O-Ring Seal
- Material / Hardness
- 75A NBR
- Cross-Section Diameter
- 0.275 in (6.99 mm)
- Inner Diameter
- 11.475 in (291.46 mm)
- Condition
- New replacement seal
Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
Fitment data verified. Exact-reference evidence is retained in the protected product audit record · Checked 2026-08-02.
Product fitment guide
Part numbers and compatible models
Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.
Part identification
Reference numbers
Primary number
Formatting alias
Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.
Product summary
NBR O-Ring Seal
- Category
- Excavator Spare Parts
- Catalog ID
- 53415478
- Photo views
- 1
Before ordering
Confirm these details
- Match the complete part number on the original component.
- Compare connectors, mounting points and visible dimensions with the product photos.
- Confirm the exact machine or engine model and serial range before ordering.
Machine fitment
Compatible model references
4 model references
Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.
Quick fitment answers
Common questions about 8H-8257
Which machines use 8H-8257?
Recorded compatible model references include Representative Cat Wheel Dozers: 824 / 824C / 824G / 824G II / 824H / 824K / 834 / 834B / 834G / 834H / 834K, Representative Cat Wheel Loaders: 966G / 972G / 980 / 980C / 980F / 980G / 980H / 980K / 980L / 980M / 982 / 986 / 988 / 988B / 988F / 988G / 988H / 988K, Other official Cat applications: Selected compactors, tractors, graders, scrapers, engines, marine transmissions and underground trucks listed by Cat, Fitment limitation: Confirm 8H-8257 and both seal dimensions against the removed O-ring before shipment. Confirm the complete part number and machine serial range before ordering.
What numbers are documented for 8H-8257?
Formatting aliases for the same number: 8H8257.
How do I confirm 8H-8257 before ordering?
Match the complete part number on the original component. Compare connectors, mounting points and visible dimensions with the product photos. Confirm the exact machine or engine model and serial range before ordering. Send clear photos of the original unit and connector layout when requesting a quote.
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