Genuine Piston Clips 4006930 For Cummins QSK23 QSK60

The SAE 9254 special spring steel, through a vacuum quenching + low temperature tempering process, achieves a combination of HRC 48-52 surface hardness and a high toughness core structure. Its anti-fatigue life is enhanced by 3 times compared to ordinary carbon steel.

Surface nitriding treatment (layer depth 0.1-0.15mm) increases the corrosion resistance by 60%, enabling it to adapt to the high temperature, acidic combustion environment of diesel engines.

The inner diameter has a tolerance of ± 0.01mm, which matches the interference fit requirements of the QSK23/QSK60 piston pin (P/N 4085643/4089872), thus eliminating axial clearance after installation.

The R angle of the open end is refined by 5-axis CNC to avoid the potential risk of fracture caused by stress concentration.

With the dual locking groove structure, auxiliary locking grooves (Patent No. US202215XXXX) are added on the basis of the traditional C-shaped circlip. Through finite element analysis, the force distribution is optimised, enabling this structure to withstand high-frequency vibration under a peak pressure of 35MPa and prevent the circlip from coming out.

Compatibility testing: With Cummins CES-14680G certification, the piston clip is adapted to the extreme pulse conditions of the QSK60 engine's upgraded MCRS fuel system (injection pressure 2500bar), and there are no records of plastic deformation.

Extreme environment verification: During the 12,000-hour continuous operation test of the QSK60 engine (supporting the 930E mining truck) in the Australian mining area, the displacement of the piston pin is less than 0.02mm, which is better than the original standard (less than 0.05mm).