Caterpillar Buna N O-Ring, PAI 321245 (OEM 5M2057), Pack of 5
Used In These Kits
This part is included in 2 engine & overhaul kits — find yours below.
Suggested Additional Parts
Commonly sold with this product. These parts are sold separately.
| Brand | PAI Industries |
| Part Category | Seals & O-Rings |
| Sub-Type | O-Ring |
| Engine Make | Caterpillar |
| Engine Model | 3400 |
| Condition | New |
| Stage / Tier | Standard |
PAI 321245 is a buna n o-ring for Caterpillar applications. PAI specifies Buna N construction. The manufacturer designates product-level OEM 5M2057. PAI cross-references Caterpillar 5M2057. PAI lists these application categories: Caterpillar 3400 Series. Confirm the complete required part number before ordering.
Pack of 5.
Manufacturer product cross-references
Caterpillar 62-6700
Caterpillar 626700
Caterpillar 8T8102
Cummins 145536
PAI Part #: 321245
OEM References:
- CATERPILLAR 5M2057
- CATERPILLAR 62-6700
- CATERPILLAR 626700
- CATERPILLAR 8T8102
- CUMMINS 145536
Applications:
- CATERPILLAR 3400 SERIES
Warranty: 2.0 year(s)
These catalog references may identify this part or components in an assembly. A listed number alone does not confirm whole-assembly interchange or vehicle fitment. Confirm the required part before ordering.
| Number |
|---|
| 5M2057 |
| 62-6700 |
| 626700 |
| 8T8102 |
| 145536 |
| CATERPILLAR 5M2057 |
| CATERPILLAR 62-6700 |
| CATERPILLAR 626700 |
| CATERPILLAR 8T8102 |
| CUMMINS 145536 |
| PAI 321245 |
No cross-reference numbers match that search.
Discovery models are listed below. Confirm the complete application and any ESN/CPL or size restrictions before ordering.
Most PAI parts carry a 2-year unlimited-mileage PAI warranty — 3 years on the High Performance tier, 1 year on Excel by PAI. See Warranty & Returns for full coverage terms, or call a specialist to confirm the exact coverage on this part.
PAI published warranty tiers: High Performance — 3-Year · Genuine PAI — 2-Year · Excel — 1-Year, unlimited mileage. The badge beside the price shows this product's recorded term; when no badge is shown, confirm coverage with a specialist.







