Search

The ball screw is a high-precision transmission element. The rolling screw is used instead of the sliding screw, and the sliding friction is converted into rolling friction. Therefore, it has the advantages of low wear, high transmission efficiency, stable transmission, long life, high precision, and high temperature rise. The ball screw has low friction, which is convenient for eliminating transmission gaps and other outstanding advantages. It brings great benefits to the performance improvement of the motor integration system. However, the ball screw cannot be self-locking, and a locking device is required when used for lifting transmission. Pre-tightening is to prevent the ball from slipping. The self-locking property of the ball screw is poor, or even non-existent, and it is easy to fall off without pre-tightening. However, not all ball screws are pre-tightened. It mainly depends on the accuracy requirements. Generally, the pre-tightening has high accuracy and large load capacity. There are four commonly used pre-tightening methods for ball screws. Let's take a look! 1. Double nut gasket pre-tightening, add a gasket between the double nuts, and the manufacturer can adjust the pre-tightening force in advance according to the user's request. It is very convenient to use and load and unload. 2. Double nut threaded pretightening uses the external thread on one nut to adjust the relative axial position of the two nuts through the round nut to achieve pretightening. 3. Double nut tooth difference pretightening, gears with a tooth number difference of 1 are cut out on the flanges of the two nuts respectively, and the two gears are meshed with the corresponding inner gear rings at both ends, and the inner gear rings are fastened to the nut seat with screws. By rotating and changing one of the nuts, the relative position of the two nuts is changed to adjust the gap and apply pretightening force. 4. Single nut variable lead self-pretightening, the internal thread raceway of the nut produces a lead mutation on the middle circle, so that the balls on the left and right ends are axially dislocated after installation to achieve pretightening. In general, the nut gasket pretightening method is simple and reliable, has good rigidity, is the most widely used, and is also more popular.

In the non-standard automation and logistics conveying industry, engineers frequently use the term "C7." As a "perennial" in precision transmission, C7-grade ball screws almost dominate the general conveying and positioning market. But have you ever wondered: Is the precision of C7 sufficient? When is it necessary to upgrade to C5? Today, we'll dissect the "truth about the cost-effectiveness" of C7 screws. I. A "Visualized" Definition of Precision: What exactly is the concept of C7? First, we need to clarify the precision standard of C7. According to ISO and JIS standards, the precision level is mainly determined by the "cumulative lead error within a 300mm stroke": C7 grade: 0.05mm (50 micrometers) C5 grade: 0.018mm (18 micrometers) Visual comparison: 50 micrometers is approximately the diameter of a human hair. For most ordinary packaging machines, palletizers, or conveyor line translation mechanisms, this error is almost negligible compared to the tolerances of mechanical assembly. Therefore, C7 can be considered the "gold standard" for ordinary conveying equipment. II. Why is C7 the "optimal solution" in terms of cost-effectiveness? In engineering design, "good enough" is the highest level of wisdom. The popularity of C7 lead screws stems from their manufacturing process—cold rolling. Cost Advantage: Cold rolling, achieved through die extrusion, boasts extremely high production efficiency, and its price is typically only 1/3 or even lower than that of ground grade (C5 and above). Mechanical Performance: The rolling process is equivalent to cold work hardening of the material; the fibrous structure on the lead screw surface is not severed, resulting in very robust wear resistance in certain heavy-duty conveying scenarios. Delivery Cycle: C7 lead screws typically have a large inventory, supporting rapid cutting and processing, making them ideal for non-standard automated equipment with tight project cycles. III. Caution: C7 May Not Be Sufficient in These Scenarios While C7 offers balanced performance, please choose carefully if your conveying equipment involves the following three characteristics: 1. The "snowball effect" of ultra-long strokes Although the error is only 0.05mm per 300mm, if your conveying stroke is as long as 2 meters or even 3 meters, and there is no secondary positioning at the end, the cumulative error may reach more than 0.3mm. 2. Extreme requirements for "quietness" and "smoothness" Because the surface roughness of cold rolling is not as good as that of ground grade, the vibration and noise of C7 lead screws will be slightly greater during high-speed operation. If used in a laboratory environment or on high-precision testing equipment, it is recommended to upgrade to C5 ground grade. 3. Extremely high-frequency reciprocating motion C7 lead screws are usually paired with clearance nuts or slightly preloaded nuts. If you require extremely high reversing accuracy (backlash approaching zero), the raceway consistency of C7 may not be able to support long-term "zero-backlash" operation, easily leading to localized overheating. Instead of pursuing excessive precision, it is better to focus on dust prevention and lubrication solutions for the lead screw, as well as the parallel installation of the support base. These details have a far greater impact on the lifespan of the equipment than a precision difference of 0.03mm.

Looking for high-performance ball screws to upgrade your CNC machining equipment or 3D printing machinery? Our precision rolled ball screws from Shuntai deliver reliable load-bearing performance, outstanding durability and flexible custom solutions, widely adopted across industrial automation, CNC lathe and desktop industrial 3D printing industries. Ball screws serve as the core transmission component of precision motion systems. Unlike traditional sliding screws, ball bearings roll between the screw shaft and nut during operation, which effectively distributes working load, boosts overall equipment rigidity and enhances the load capacity of your automation setup. Core Construction: Internal Circulation Ball Screw Structure Our mainstream internal circulation ball screw consists of four core parts: screw shaft, nut, steel balls and internal deflectors (return caps). 1.Steel balls run in a single closed loop inside the nut channel; 2.Built-in return caps span and link adjacent ball grooves inside the nut body; 3.Steel balls change movement direction via the inner return cap to form a fully enclosed circulating path. Since all return components are embedded inside the nut housing, this internal circulation design keeps the ball screw compact in outer dimension, saves installation space for your compact CNC and small-format 3D printer equipment, a key advantage for space-limited automated machinery designs. Key Product Specifications & Advantages Item Details Brand Shuntai Raw Material GCr15 bearing steel, carbon steel & bronze optional Production Process Rolled screw shaft / Ground screw shaft for different precision grades Core Feature Extra-long service lifespan, stable running with low friction Lead Time 7-day quick production & delivery Shipping Port Shanghai, China Two Craft Options to Match Your Needs 1.Rolled Ball Screw: Cost-effective option for standard precision CNC equipment, regular 3D printers and general automation machinery, balances performance and procurement cost; 2.Ground Ball Screw: Ultra-precision finished for high-end CNC machining centers and high-precision industrial 3D printing, meets strict micron-level positioning requirements. 3.We adopt premium GCr15 bearing steel as primary raw material, a common high-strength alloy for motion transmission parts. The material brings strong wear resistance and anti-fatigue property, directly extending the whole screw service life and cutting your long-term equipment maintenance and replacement expense. Bronze accessory alternatives are also available per your custom design request for special working environments.Custom Service for Global Buyers One of our biggest highlights is flexible customization. Whether you need bespoke pitch, shaft diameter, overall length or special nut structure for your unique CNC retrofit project or customized 3D printer build, our engineering team can tailor-make ball screws according to your technical drawings and parameter requirements. From small-batch prototype orders for R&D 3D printing manufacturers to bulk OEM procurement for CNC equipment factories, we handle orders of all sizes with fixed 7-day fast lead time to shorten your production waiting cycle. All goods depart from Shanghai port with mature global logistics connections, covering Southeast Asia, Europe, North America and other mainstream industrial markets worldwide. Why Choose Our Shuntai Ball Screw?1.Durability First: Premium raw material + mature internal circulation structure greatly reduce part wear, so your equipment runs consistently for years;2.Flexible Customization: No rigid stock specs constraint, modify every key dimension to perfectly fit your machine installation;3.Fast Delivery: Stable production schedule ensures goods ready within 7 working days after order confirmation;4.Dual Process Choice: Rolled & ground two production technologies to fit low-budget standard use and high-precision industrial use respectively.Call To ActionAre you currently sourcing replacement ball screws for your faulty CNC machines or designing new 3D printer models with custom transmission parts? Click our consultation button to send your dimension drawings or technical demands now, our professional engineering sales will reply with a detailed quotation within the shortest time!

In modern automated machinery, ball screws serve as the core transmission component that converts rotary motion into precise linear movement. Standard ball screw models fit universal equipment, yet many specialized automation, medical, micro-electronic, and precision instrument projects demand customized dimensions, materials, and load performance. Our SHUNTAI custom miniature grinding ball screws (MIA0401, MIA0401b, MIA0601) are engineered exclusively for non-standard industrial motion scenarios. Built from premium GCr15 bearing steel with both rolled and ground machining processes, these compact ball screws deliver long service life, ultra-smooth operation, and customizable specs to match your unique mechanical design constraints. What Makes Non-Standard Custom Ball Screws Indispensable? Unlike off-the-shelf standard ball screws, custom non-standard ball screws are fully adjusted to your project’s exact engineering requirements. They solve pain points that generic transmission parts cannot address: Customized dimensional limits for tight spaces Many miniature automation devices, lab testing equipment, and compact actuator systems have strict spatial restrictions. We fully customize core parameters including screw diameter, overall length, lead, and nut outline size to fit confined installation layouts without sacrificing motion precision. Our MIA mini series specializes in ultra-small diameter micro screw structures ideal for compact machinery. Specialized material matching for harsh working environments Our base material is high-strength GCr15 bearing steel for standard precision applications. For special working conditions such as corrosion exposure, high-temperature operation, or medical clean environments, we support custom material upgrades including stainless steel and high-temperature wear-resistant alloys to extend component lifespan under extreme conditions. Custom load & speed performance design High-load industrial actuators and high-speed precision inspection equipment have divergent motion demands. We redesign the ball circulation track, thread profile, and nut structure for custom ball screws, boosting load capacity, lowering friction, and enabling stable high-speed reciprocating movement for your equipment. Custom manufacturing & surface finishing processes Beyond standard rolling and grinding machining, we provide exclusive custom processing solutions: special thread grinding tolerances (C3/C5/C7 precision grades), customized surface hardening, anti-rust coating, and tailored end-machining features to match your coupling, bearing, and assembly structure perfectly. Core Advantages of SHUNTAI MIA Custom Miniature Ball Screws Our tailored micro ball screws are widely adopted across global precision manufacturing sectors: Medical automation equipment & laboratory testing instruments Optical inspection machinery & semiconductor micro-processing devices Small automated actuators, robotics joint micro-drives Precision measuring instruments & miniature CNC equipment Packaging automation compact linear drive modules Why Choose SHUNTAI as Your Custom Ball Screw Supplier? As a professional ball screw manufacturer specializing in non-standard customization, we deliver end-to-end custom service: from technical drawing review, structural optimization design, sample trial production, to mass manufacturing. Our engineering team collaborates closely with overseas buyers to resolve all unique motion transmission challenges, improving your equipment’s overall stability, precision, and operational efficiency. Whether you need micro miniature ball screws from the MIA series or large-size heavy-load custom ball screws, send us your technical drawings and parameter requirements for a free technical consultation and quotation. Final Words Generic standard ball screws often force engineers to compromise on equipment design. Custom non-standard ball screws eliminate design limitations, letting you build machinery fully aligned with your performance targets. Our SHUNTAI MIA series precision miniature custom ball screws balance compact size, reliable durability, and flexible customization, making them the ideal linear motion solution for your specialized industrial projects. Contact our team today to discuss your custom ball screw specifications and unlock optimized linear transmission performance for your machinery!