Suction Spring (Short) for Kerr KA-3500PT/Q5450PT (SKU:KA-52S), forged from ASTM A228 spring steel (0.85-0.95% carbon), vacuum heat-treated (HRC 45-50) with shot peening (SAE J443), spring force ≥850MPa, fatigue life >100k cycles, API 7K compliant, compatible with Rhino Supply 252100/252105 replacements.
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