The 3012472 Captive Washer Cap Screw is engineered for compatibility with Cummins engines, including ISB, QSB, B3.3, B4.5, 4B3.9, 6B5.9, K19, K38, K50, QSK, N14, NH, NT855, QSN14, QST30, V28, V903, M11, and L10. Reliable and durable construction ensures optimum performance.