303046 Piston Cup Kit (6.00", Series B), forged from ASTM A350 LF2 carbon steel (yield strength ≥250MPa), quenched+tempered (HRC 28-32) with polyurethane surface coating (≥0.5mm thickness), API 7K Triplex mud pump compliant, sealing pressure ≥30MPa, ISO 15154-E extrusion rating, direct replacement for National 1090-6219K upgrade.
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