What Is a Ball Screw and How Does It Work?

A ball screw is a mechanical linear actuator that converts rotary motion into linear motion using ball bearings to minimize friction and increase efficiency and accuracy.

What Types of Ball Screws Do You Offer?

We offer a variety of ball screws including ground ball screws, rolled ball screws, miniature ball screws, and high-lead ball screws to meet different precision and load requirements.

How Do I Choose the Right Ball Screw for My Application?

Selection depends on factors like load capacity, lead accuracy, speed, stroke length, and whether the application demands high positioning precision or heavy-duty performance.

What Is the Difference Between Ground and Rolled Ball Screws?

Ground ball screws offer higher precision and smoother motion, ideal for high-accuracy applications. Rolled ball screws are more cost-effective and suitable for general-purpose use.

What Maintenance Is Required for a Ball Screw?

Regular lubrication is essential. Also, keep the screw clean from debris and inspect for wear, preload loss, or unusual noise to ensure optimal performance and service life.

Roller Bearings for Heavy-Duty Industrial Applications – Reliable Wholesale Supply from China

Sourcing the right roller bearings isn't just about price. It's about matching load capacity to your machinery's demands without downtime surprises. We've seen importers chase cheap options only to face early failures in high-vibration environments.

As an export manager who's handled thousands of bearing orders to the US and Europe, I know the drill. You need cylindrical rollers that handle radial loads over 100kN, or tapered ones for combined axial thrust. Skimp on precision classes, and your assembly lines grind to a halt. That's why at YIDI Motion, we focus on bearings built for real-world punishing conditions – from steel mills to conveyor systems.

Picture this: a Midwest steel fabricator last year. They were burning through imported generics every six months. Switched to our full complement cylindrical rollers, and uptime jumped. No fancy stats, just consistent performance. We stock common sizes but excel in custom OEM runs – P0 to P6 tolerances, chrome steel 52100 or stainless if corrosion's an issue.

Our factory in Hebei pulls from Japanese grinding tech for surface finishes under Ra 0.2μm. That means quieter operation and longer grease life. Importers tell us they cut reorders by half. We're not the cheapest, but our lead times beat most – 15-30 days FOB Xingang, full container loads optimized at 20-25 tons.

Let's break it down. Roller bearings shine where ball types falter: heavy radial loads, misalignment tolerance. Take NU series cylindrical – inner ring removable for easy maintenance. Or 222 series spherical for self-aligning in pillow blocks. We've shipped these to automotive presses in Detroit and wind turbine bases in Texas.

Procurement teams often overlook dynamic load ratings. C or higher for continuous duty. We test every batch to ISO 281 life calculations, sharing the math if you ask. No black box here. And for high-speed apps, our cages – brass or polyamide – keep things cool under 15,000 RPM.

Global trade adds layers. Duty codes? 8482.10 for these. We handle CIQ certs, fumigation if needed, even third-party SGS inspections at origin. US buyers appreciate our REACH compliance for EU resale. One client in California dodged a recall headache that way.

Extending this thought, material matters. GCr15 chrome steel is standard – hardness 58-62 HRC post-heat treat. For harsh chem plants, 9Cr18Mo stainless. We've done vacuum remelt for ultra-clean apps like semiconductor wafer handlers. Tolerances? ABEC 1 to 5 equiv, ABMA classes.

Installation pitfalls kill more bearings than wear. Press fits need controlled force – we've seen bores distorted by overzealous hammers. Our tech sheets cover interference fits down to microns. Pair with proper shaft shoulders, and you're set for years.

Logistics from Shijiazhuang: Rail to Xingang in 2 days, then sea to LA in 25. We consolidate with ball screws or linear guides – same factory. Saves you freight headaches. MOQ? Flexible – 100 pcs for samples, full pallets for export.

Why trust us? 100+ staff, 30% seniors with 20+ years. German Hass grinding machines, Japanese Okuma lathes. Exports to 50 countries since 2020. ISO 9001, RoHS ready. Talk to Adam direct: +86 18134111662 or adam@yidimotion.com.

This isn't hype. It's what works when your ops manager calls at 3am about a seized roller. We deliver bearings that match your torque curves and keep running.

Common Procurement Risks with Roller Bearings

Buying bearings blind is a gamble. US importers often hit snags: mismatched tolerances leading to vibration issues, or grease leaching out early. One Midwest plant lost a week replacing 200 units because the supplier fudged C3 clearances.

Counterfeit flood from unverified Alibaba sellers. They look good, fail fast – brinelling under shock loads. Always demand mill certs and dynamic balance reports.

Lead time traps. "Stock ready" turns into 90 days. We quote firm schedules, buffer for CNY holidays.

Currency swings and tariffs. Section 301 duties on 8482? We advise HTS classification upfront. Risk-averse? Lock pricing with LC at sight.

Undersized load ratings – check C and Pu values
Poor packaging – rust en route
No traceability – headaches for ISO audits
Inflexible MOQs – ties up capital

YIDI Roller Bearings: Built for Reliability

Our lineup covers it. Cylindrical (NU/NJ/NUP), tapered (302/322 series), spherical (213/222/223), needle for tight spaces. Full complement where max load counts.

Advantages stack up:

Radial load champ – up to 500kN in 120mm OD
Misalignment forgiving in spherical types
Removable rings for shrink fits
Sealed options cut relube cycles

Compared to balls: Rollers spread contact area, lower Hertz stress. Life expectancy doubles in many setups.

Detailed Technical Specifications

Type	Bore (mm)	OD (mm)	Width (mm)	Dyn Load C (kN)	Stat Load Pu (kN)
NU 310	50	110	27	92	107
22212	60	110	28	130	173
30210	50	90	21.75	65	72
NU 215	75	130	25	102	125
21316	80	170	39	225	270

roller bearing bearing roller taper roller bearing

Custom sizes available. Tolerances per GB/T 4604 (ISO 492 equiv). Seals: 2RS or ZZ.

Real-World Applications

Steel rolling mills: Tapered for thrust. Conveyors: Cylindrical NU. Paper machines: Spherical for flex. Gearboxes: Needle rollers.

In wind turbines, our 240 series handle 2MW nacelles. Automotive – wheel hubs with tapered 302.

Proc tip: Match roller length to your max misalignment. Overdo it, and edge stresses spike.

Our Manufacturing Strengths

HEBEI YIDI IMPORT AND EXPORT TRADING CO.,LTD. – YIDI Motion factory: 100 employees, 30% seniors. Advanced from Germany (Hass) and Japan (Okuma). CNC grinders hit 0.001mm precision.

Ac Compressor Bearing

Vertical integration: From steel bar to finish grind. Heat treat in-house for consistent case depth. Exports to USA, Germany, Japan – 50+ countries.

Certifications: ISO 9001 RoHS Ready for CE on request.

Global Shipping & Logistics

FOB Xingang/Tianjin. 20' container: 10-15 tons bearings. LCL options. Transit: 25-35 days to US West Coast.

We palletize with VCI paper, wooden cases. Full docs: CO, packing list, B/L. Incoterms flexible – DDP possible.

Pro tip: Combine with linear guides for mixed loads – better rates.

Request Shipping Quote

Installation and Maintenance Insights

Heat rings to 80C for press. Use inductions, not torches. Torque locknuts per table.

Grease: Lithium NLGI 2, relube intervals 2000-5000 hrs @ 50% speed.

Watch for: Fretting on shafts – needs hard chrome. Vibration analysis early warns spalling.

Measure housing bore cold
Induction heat, not flame
Check radial clearance post-fit
Run-in at half speed

What Buyers Say

John M., Procurement Mgr, Ohio Steel Fab: "Switched from Euro supplier. YIDI's NU313 held up in 24/7 rolling. Lead time spot on, pricing beat SKF quote."