Piston Hub O-Ring (SKU:110-000024-218) Complies with ASTM D2000-18 NBR rubber (Oil Resistance Class 2), Shore A 70±5 hardness, temperature range -30°C~120°C. Vulcanized at 200°C×20min, compression set ≤15% (GB/T 528-1998). API 7K compatible for mud pump piston assembly, salt spray tested >1000hrs corrosion-free, UNF 3A thread accuracy.
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