Cat 3406 Piston, PAI 311020 (OEM 6N4126), Pack of 1
Used In These Kits
This part is included in 1 engine & overhaul kits — find yours below.
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311021Caterpillar Piston Kit, PAI , Pack of 1 Ships from supplier · Lead time confirmed when you order - No kits match that search.
| Engine family | Caterpillar 3406 (A/B/C) |
| Brand | PAI Industries |
| Part Category | Pistons, Rings & Rods |
| Sub-Type | Piston |
| Engine Make | Caterpillar |
| Engine Model | 3406 |
Pack of 1.
PAI 311020 is a piston for Caterpillar 3406 applications; PAI specifies 15:1 compression ratio and 5.40-inch bore. The manufacturer-designated reference is Caterpillar OEM 6N4126. This listing identifies the piston component; no additional assembly components are represented. PAI cross-references Caterpillar: 6N4112, 6N4126; Dana Corporation/Private Brand Sale: 224-3239X.
Match the complete part number and required application before ordering.
Fits:
- CATERPILLAR 3406 ENGINES
OEM cross-references:
- CATERPILLAR 6N4112
- CATERPILLAR 6N4126
- DANA CORPORATION/PRIVATE BRAND SALE 224-3239X
Warranty: 24 months
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 |
|---|
| CATERPILLAR 6N4112 |
| CATERPILLAR 6N4126 |
| DANA CORPORATION/PRIVATE BRAND SALE 224-3239X |
| PAI 311020 |
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.

