Caterpillar part numbers starting 1N4
| 1N4054 | Shaft (rear gear group) | Caterpillar | ||
| 1N4-087 | Elbow (water lines, aftercooler) | Caterpillar | ||
| 1N4640 | Tube (injector, lines, fuel) | Caterpillar | ||
| 1N4730 | Coupling (turbocharger, housing) | Caterpillar | ||
| 1N4734 | Clamp (injector, lines, fuel) | Caterpillar | ||
| 1N4858 | Adapter (water lines, lower) | Caterpillar |