3968959 Hexagon Flange Head Cap Screw

3968959 hexagon flange head cap screw is a universal fastener compatible with a wide range of Cummins engines, covering ISB, QSB, B3.3, B4.5, B5.9, B6.7, ISC8.3, ISG11, ISX12, ISZ, QSZ, Z13, QSC9, QSL9, X12, X11 and Z14. Made with high-grade alloy steel and quenching treatment, it delivers powerful tensile strength and anti-loosening performance under engine vibration and thermal expansion. The integrated flange design spreads compression force evenly to protect component surfaces. Threads are precisely rolled for smooth tightening and repeated disassembly. Widely used in engine assembly and overhaul, it provides reliable fastening for diverse Cummins power equipment.