C3 C5 C7 precision ball screw

When your automated machinery, CNC equipment, or automation production line needs stable, precise rotary-to-linear motion conversion, a high-performance ball screw becomes the core component you cannot compromise on. Shuntai DFU external circulation double nut ball screw is engineered to deliver ultra-smooth, low-noise, long-lasting linear transmission, widely adopted across industrial automation, machining centers, 3C automation, medical equipment, and precision testing machinery. What Is An External Circulation DFU Ball Screw? A ball screw is a mechanical transmission component that converts rotational motion into precise linear motion. It consists of threaded screw shaft and ball circulation nut assembly. Tiny steel balls roll between the screw thread and nut raceway, replacing sliding friction with rolling friction—this drastically cuts friction loss, boosting efficiency and accuracy compared to traditional trapezoidal lead screws. Our DFU external circulation double nut design optimizes the ball circulation path: the external deflector ensures smooth ball recycling without jamming, while the double nut structure enables adjustable preload to eliminate backlash entirely. The final effect: zero clearance movement, quiet operation, and consistent positioning accuracy over thousands of working hours. Core Product Specifications of Shuntai DFU Ball Screw Item Details Product Name DFU External Circulation Double Nut Ball Screw Brand Shuntai Main Raw Material GCr15 bearing steel; Optional stainless steel, alloy steel, carbon steel, aluminum, brass for custom projects Shaft Manufacturing Process Rolled screw shaft / Ground screw shaft Precision Grades Available C3, C5, C7 precision classes to match different accuracy demands Lead Time Standard stock models ship within 7 working days Loading Port Shanghai Port, China MOQ 1 unit sample available for performance testing Packaging Custom export-grade packaging per client requirements Standout Performance Features 1.Zero Backlash & High Rigidity The double nut preload structure fully eliminates axial clearance. The assembly maintains outstanding rigidity under heavy load, ideal for high-speed reciprocating positioning tasks that demand repeat accuracy. 2.Ultra Low Noise Smooth Operation Polished raceway surface and optimized external circulation loop reduce ball collision noise significantly. The whole unit runs quietly even at continuous high operating speeds, suitable for indoor precision equipment and noise-sensitive production workshops. 3.Extended Service Life & High Durability Core components use premium GCr15 bearing steel with strict heat treatment and surface hardening. Uniform load distribution on rolling balls minimizes wear, delivering stable performance for long-term continuous operation. 4.High Positioning Precision We supply three standard precision grades: C7 for general automation, C5 for mid-precision CNC machinery, C3 for ultra-precision lab equipment and high-end machining centers. Every piece goes through full precision inspection before delivery. 5.Customizable OEM Support As a professional OEM ball screw factory, we offer full custom machining: custom screw length, special lead, custom flange shape, modified nut mounting holes, surface anti-rust treatment, and special material matching for corrosive or lightweight working environments. Our Factory Production & Quality Control AdvantagesWe operate a complete precision machining workshop with full production lines covering every processing stage: Cold rolling, CNC grinding, CNC turning, milling, drilling, straightening, and precision finishing. Every ball screw follows a 100% full inspection workflow throughout manufacturing:  Raw material composition test Screw thread precision measurement Nut assembly preload testing Noise & smooth running inspection Surface hardness and anti-rust checkWith abundant in-house inventory of standard DFU ball screw sizes, we guarantee fast, secure export shipping to global clients. Our one-stop OEM service covers custom processing, assembly, and tailored export packaging to avoid damage during long sea or air transit.Common Application ScenariosOur DFU double nut ball screws fit nearly all precision linear motion equipment: CNC machine tools & machining centers Automated production assembly lines 3C electronics testing & processing equipment Medical automation instruments Laser cutting & engraving machinery Automated logistics and lifting platforms Precision laboratory testing equipmentWhy Choose Shuntai DFU External Circulation Ball Screw?✅ Adjustable preload double nut design, no backlash for precise positioning   ✅ Low-noise external circulation structure for smooth high-speed movement   ✅ Multiple precision grades (C3/C5/C7) to fit low to ultra-high accuracy needs   ✅ Multiple material options for standard, corrosion-resistant or lightweight working conditions   ✅ Small MOQ: 1pc sample order supported for pre-production testing   ✅ 7-day fast shipment for standard stock models, flexible OEM customization   ✅ Full in-house quality control, reliable long-term durability   ✅ Export-ready packaging & shipping from Shanghai Port to worldwide destinationsGet Your Custom Ball Screw Solution TodayWhether you need standard size DFU double nut ball screws in stock or fully customized OEM linear transmission parts for your machinery project, our engineering team can provide tailored drawings, technical parameter consultation, and competitive factory direct pricing. Click the consultation button to send us your working load, travel length, precision requirement, and application details—we will reply with a professional solution within 24 hours.