| Part Number | 130‑5190 | Genuine Caterpillar nozzle |
| Application | CAT 3406C (mechanical unit injector) | Commonly fits engine prefixes 8PN, 2EK, 9CK, etc. |
| Nozzle Type | Multi‑hole, valve‑covered orifice (VCO) | Sac‑less design for reduced emissions and precise spray |
| Number of Spray Holes | 4 – 6 | Exact count varies with engine arrangement |
| Spray Hole Diameter | Typically Ø0.25 – Ø0.35 mm (approx. 0.010 – 0.014 in) | Laser‑drilled; size matched to combustion chamber |
| Opening Pressure (Pop Pressure) | 290 – 320 bar (4,200 – 4,650 psi) | Set by spring preload; must be calibrated per injector |
| Needle Valve | Precision guided, differential area type | Ensures consistent timing and atomization |
| Material | High‑alloy steel (e.g., SAE 52100 equivalent) | Heat‑treated for wear and erosion resistance |
