Heavy-Duty Rotary Kelly Drill Strings - Square & Hex Options

Heavy-Duty Rotary Kelly Drill Strings - Square & Hex Options. Premium Alloy Material: Manufactured from AISI 4145H-modified, fully heat-treated alloy steel with high hardness and impact value. Precision Machining: CNC milling ensures tight tolerances and high quality drive sections with strict straightness inspections. Comprehensive Inspection: Ultrasonic inspection performed on all sections with 100% visual inspection for finished products. Flexible Customization: Offers full, minor, and flexible customization options based on samples or designs. Lifetime Support: Provides lifetime technical support and a 12-month warranty for mechanical equipment. Fast Lead Time: Average lead time within 15 workdays for both peak and off-peak seasons. Protective Packaging: Shipped in protective steel-cased scabbards with pressed steel thread protectors. Diverse Payment Terms: Accepts LC, T/T, D/P, PayPal, Western Union, and small-amount payments.