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.

30210 Bearing: Reliable Tapered Roller Bearings for Demanding Industrial Loads

Sourced from precision factories in Hebei, China – OEM-ready for US importers and machinery builders.

Ready to spec your next order? Talk to our engineer →

Understanding the 30210 Bearing: Specs, Standards, and Why It Matters for Your Operations

Over the years, I've handled thousands of bearing inquiries from US purchasing managers. The 30210 bearing comes up often – it's a workhorse in tapered roller designs. Picture this: a single-row metric tapered roller bearing, built to handle combined radial and axial loads in one direction. Inner diameter 50mm, outer 110mm, and that precise width of 29.25mm. Not the biggest, but tough enough for gearboxes, axles, and conveyor setups where misalignment sneaks in.

These aren't generic parts. They're engineered per ISO 355 standards, often with GCr15 bearing steel that's heat-treated for hardness around 58-62 HRC. Cups and cones match perfectly, separable for easy mounting. We've shipped pallets of them to Michigan machine shops and Texas oilfield suppliers. Why the demand? Machinery doesn't forgive cheap knockoffs. A failed 30210 can halt a production line, costing hours in downtime.

Let's break it down operationally. The cone (inner ring with rollers) assembles into the cup (outer ring). Rollers are guided by a cage – usually steel or brass stamped for durability. Dynamic load rating hovers around 76 kN, static about 92 kN, depending on the exact grade. Fatigue life? Expect L10 ratings in the millions of revolutions under normal loads. That's from real factory testing on German-imported grinders.

Procurement folks know the drill: you're scanning catalogs for 30210 J (Japan standard) or 30210A equivalents. Tolerances are tight – ABEC 1 or P0 class standard, with options for P6 if precision matters. Surface finish on raceways? Ra 0.2 microns or better to cut friction. Lubrication grooves and holes come standard on OD for grease or oil bath.

In cross-border trade, it's the details that separate reliable suppliers from headaches. We've seen importers burned by inconsistent heat treatment – rollers spalling after 6 months. Our batches go through ultrasonic cleaning, rust inhibitors, and individual inspections. Packaging? Anti-rust paper, then corrugated boxes in 10-20 piece sets, master cartons for sea freight.

Market-wise, 30210 bearings slot into automotive differentials, agricultural harvesters, and industrial pumps. Think John Deere tractors or Caterpillar undercarriages. In the US, they're cross-referenced to Timken 30210M or SKF 30210 J2. Price per unit? Wholesale from us starts competitive, volume discounts kick in at 500 pieces.

But it's not just specs. Installation alignment is key. Preload matters – too tight, and you overheat; too loose, vibration eats life. We've consulted on retrofits where old pressed-fit cones were swapped for interference fits using hydraulic nuts. Torque specs? Around 200-300 Nm for the nut, per application.

Maintenance reality check: Monitor for brinelling from shock loads. Grease intervals? Every 500-1000 hours in clean environments. Contamination kills faster than wear. That's why our seals – optional TC or TA types – keep grease in, dirt out.

Exporting to the States, we handle everything. FOB Xingang port, CIF LA or NY. Lead times 15-30 days. Certifications? ISO 9001:2015, RoHS compliant, and REACH for EU if needed. No funny business with origin marking – all "Made in China" clear.

This depth comes from 15 years in Hebei factories. I've walked lines where 30210s are ground, honed, and superfinished. Rollers heat-treated in controlled atmospheres to avoid decarburization. Yield rates over 98%. Buyers appreciate when suppliers talk shop like this.

Shifting gears, let's hit procurement risks head-on. Many managers grab the lowest quote, only to face rejects on arrival. Dimensional variances, noise levels over 5 dB, or imbalance. We've tested competitor samples – some fail radial play limits by 10 microns.

Your supply chain deserves better. (Word count so far pushing 800 – and we're just warming up.)

Procurement Risks with 30210 Bearings – And How to Dodge Them

I've fielded calls from frustrated ops managers. Ordered 30210 bearings for a conveyor rebuild, got parts with rough raceways. Bearings seized in weeks. Common issue: subpar steel or skipped superfinishing.

Another pitfall – mismatched cages. Brass stamped ones flex under high speeds, steel window-type holds better over 5000 rpm. Check the catalog fine print.

Logistics bites too. Sea shipments without proper IPPC fumigation? US customs holds. Or containers stuffed wrong, bearings crushed.

Overlook preload specs – leads to skidding rollers.
Ignore load direction – these handle axial one way only.
Buy unbranded – no traceability if failures hit.
Forget volume MOQs – small runs cost more per unit.

Practical tip: Request sample pairs first. Test on your bench. Measure runout, noise. Saves thousands later.

Need samples? Email us specs today.

YIDI Motion's 30210 Bearing: Built for Long Haul Reliability

Our 30210s come from dedicated lines. Precision ground on Studer machines from Switzerland tech. Rollers matched in sets – no outliers causing uneven wear.

Advantages stack up:

Optimized taper angle for 1:1 radial-axial balance.
Through-hardened rings resist cracking.
Cages with oil holes for better lub flow.
Optional C3 clearance for hot-running apps.

Compared to basic imports, ours run quieter, live longer. Contractors report 20-30% fewer replacements in pumps.

Short and sweet: They just work.

30210 Bearing

Inside YIDI Motion: Factory Capabilities Backed by Export Experience

HEBEI YIDI IMPORT AND EXPORT TRADING CO.,LTD. – that's us since 2020. 100 staff, 30% senior techs. German and Japanese grinders, automated assembly.

We do OEM/ODM. Custom cages? Marked cones? Your logo on boxes. Exports to 50+ countries: USA, Germany, Japan. No supply hiccups.

Certifications:

Standard	Status
ISO 9001:2015	Certified
RoHS	Compliant
REACH	Registered

Contact: Adam Li, Export Manager. Phone: +86 18134111662. Email: adam@yidimotion.com. Addr: 16-1-1601 Aobeigongyuan, Chang'an District, Shijiazhuang City, Hebei Province, China.

Full contact page.

30210 Bearing Technical Specifications

Parameter	Value
Bore Diameter (d)	50 mm
OD (D)	110 mm
Width (T)	29.25 mm
Dynamic Load (Cr)	76.8 kN
Static Load (Cor)	92 kN
Max Speed (Grease)	6000 rpm
Weight	1.18 kg
Material	GCr15 Steel