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.

Angular Contact Ball Bearing Supplier – Precision OEM Solutions from YIDI Motion

Reliable high-speed angular contact bearings for machine tools, spindles, and heavy-duty applications. Custom OEM/ODM manufacturing with short lead times. Exported to USA, Europe, and beyond.

Get Factory Quote Request Specs

YIDI Motion angular contact ball bearing production line

By Adam Li, Export Manager | YIDI Motion | 15+ years in precision bearing exports

Last updated: October 2026

Procuring angular contact ball bearings isn't just about picking the cheapest option on Alibaba. I've shipped thousands of sets to machine shops in the US Midwest and spindle builders in Germany over the years. One wrong preload spec, and your CNC machine starts vibrating like it's on a washing machine spin cycle. That's why buyers keep coming back to us at YIDI Motion.

We're not some fly-by-night trader. HEBEI YIDI IMPORT AND EXPORT TRADING CO., LTD., doing business as YIDI Motion, set up shop in 2020 with a focus on linear motion parts—ball screws, linear guides, actuators, splines, and yes, bearings like these angular contact ones. Our factory team of 100 handles everything in-house, with over 30% senior technicians dialing in the precision on German and Japanese equipment. Exports to 50+ countries, including steady orders from the States, Canada, France, and Japan.

What sets angular contact ball bearings apart? They take both radial and axial loads at the same time, thanks to that offset contact angle—usually 15°, 25°, or 40° depending on your setup. Perfect for high-speed spindles where deep groove bearings would just burn out under thrust. But sourcing them? That's where most importers trip up. Fake preload claims, inconsistent inner ring tolerances, or bearings that seize after 500 hours. We've seen it all.

Take a typical inquiry I handled last month: a Texas machine tool rebuilder needed 7014AC angular contacts for a retrofitted Haas mill. Off-the-shelf from big brands? Six-week lead times and markup that eats your margin. We quoted matched ABEC-7 precision, duplex preload pairs, at half the landed cost, shipped in 12 days via express to Houston. No duties surprises either—we handle HS codes right (8482.10).

Our stock runs deep groove, angular contact, thrust—you name it. But angular contacts are the workhorses for OEMs building pumps, compressors, robotics arms, even electric vehicle hubs. Materials? Chrome steel GCr15 standard, with stainless or ceramic hybrids for harsh environments. We grind races to P4 class, match pairs for rigidity, and test runout under load before packing.

Buyers often ask about the contact angle choice. Steeper 40° for heavy axial bias, like in milling heads. Shallower 15° for super-high RPMs in grinders. We run simulations if you send spindle drawings. And ODM? We've customized cages from brass to polymer for noise-sensitive apps. No minimums that scare off mid-size importers.

Logistics side: From Shijiazhuang, we're 300km from Tianjin port. Full 20ft container of bearings? 8-10 tons easy, palletized per your specs. Air freight for prototypes? DHL next-day prototypes to LAX. We've dodged port jams post-COVID by routing through Qingdao too. Tariffs? We classify precisely to minimize—talk to me direct at +86 18134111662 or adam@yidimotion.com.

Stick around. I'll walk you through the risks you're probably facing right now, our exact specs, real buyer scenarios, and why switching suppliers could cut your downtime by weeks. Questions? Hit reply.

Common Pitfalls When Sourcing Angular Contact Ball Bearings Overseas

I've audited dozens of supplier claims for US clients. Ninety percent exaggerate dynamic load ratings. A 7205B bearing quoted at 15kN Cr? Tests show 11kN before spalling. Procurement directors get burned on this—machines fail warranty, rework costs skyrocket.

Lead time lies are killer. "Stock ready" turns into 8 weeks when their subcontractor's line breaks down. We've had importers miss production runs because of it. Tolerance drift too: advertised P5, but measured P6-P7 runout. Your spindle thrust shifts 0.02mm, chatter marks everywhere.

Preload mismatches: Single-row universals look cheap, but pair them wrong and axial play destroys rigidity.
Grease incompatibility: Cheap lithium for high-temp apps? Seals blow at 120°C.
Poor packaging: Bearings arrive brinelled from rough handling—no VCI bags, rust in weeks.
Cert gaps: No real ISO 9001 audit trails, just badges. RoHS? Questionable.

Practical tip: Always request CMM reports and noise/vibe test data. We send those standard. Risk-averse? Start with samples—10 pieces matched set, $200 freight paid.

Buyer Note: If your current supplier's MTBF dropped last quarter, it's likely tolerance creep. We've fixed that for rebuilders coast-to-coast.

Audit Your Current Source – Free Consult

Technical Deep Dive: Our Angular Contact Ball Bearing Lineup

Angular contacts shine where loads combine radially and unidirectionally axial. Raceways offset creates that line contact, boosting thrust capacity 2-3x over radials. We produce per ISO 281, with options matching SKF 70xx or NSK 719xx series footprints.

Core range: Bore 10-120mm, OD up to 260mm. Contact angles machined precisely: 15° for max speed (1M+ dNm), 25° balanced, 40° thrust-heavy. Preloads: Light G, medium GM, heavy GH—duplex AB or DB configs standard.

Model	d (mm)	D (mm)	B (mm)	Contact Angle	Cr (kN)	Speed (rpm)
7005AC	25	47	12	25°	10.3	18000
7012C	60	95	18	15°	31.5	12000
7208B	40	80	18	40°	42	10000
71916 ACD/P4	80	110	16	25°	36	9000

angular contact ball bearing manufacturer wholesale angular contact ball bearing angular contact ball bearing service

Custom? Bore tapers, hybrid ceramics (Si3N4 balls), Kluber grease packs. Accuracy to P2 on request—vibe levels below 1.5µm/s at 50% speed. Lifecycle? 10,000-20,000 hours typical in spindles, depending on lubing.

Installation heads-up: Press-fit h6-g6 on shafts. Heat rings to 80°C max. Preload via nut torque—our charts match DIN 628. Misalign by 5' and life halves.

Download Full Catalog PDF

Real-World Applications and Performance Notes

Spindle bearings in CNC lathes? Our 7010s run 12,000rpm continuous, no thermal growth issues. Pump makers pair them back-to-back for impeller thrust—handles 5kN easy.

Robotics: Low-friction 15° types in SCARA arms, reducing servo amp draw 15%. Automotive test rigs: Duplex sets endure 50g accel. Even wind turbine yaw drives use scaled-up versions for pitch control.

High-speed milling: Matched pairs, phenolic cages.
Compressors: Sealed variants, polyurea grease.
Wheel hubs: Heavy preload 40° for EV traction.
Precision grinders: P4 ceramic hybrids.

Angular contact bearings in spindle application

Maintenance reality: Clean with solvent yearly, relube every 1,000 hours or 10% life. Overheat? Check cage wear first.

Behind the Scenes: YIDI Motion Factory Strengths

Located at 16-1-1601 Aobeigongyuan, Chang'an District, Shijiazhuang, Hebei, China. 100 employees, but production's tight: DMG Mori grinders from Germany, Okuma lathes from Japan. Superfinishing on races hits Ra 0.08µm.

Angular Contact Bearing Service

OEM/ODM full service: From CAD to prototype in 3 weeks. Brands we've supplied? Think OEM for spindle rebuilds feeding Boeing lines, without naming names. Capacity: 50,000 units/month on angulars alone.

Certifications aren't wall art. Live audits:

Reach compliant too. Traceability laser-etched on rings. 1% AQL inspection, full Magnaflux mag particle on request.

Global Shipping and Procurement Logistics

Shijiazhuang to Tianjin: 4-hour truck, daily sailings. 20GP holds 4,000 med-size angulars palletized (1.2m x 1m bases). LCL? 500kg min. US duties: 2.5% on 8482.10.2016— we quote DAP Incoterms standard.

Express: DHL/UPS to Chicago 5-7 days, $15/kg. Samples tracked live. Post delays? We airlifted 200 duplex sets to Canada during 2026 backups.

Shipping Tip: Consolidate with ball screws/linear guides for full pallet rates—saves 20% freight.

Call for Shipping Quote

What Importers Are Saying

John M., Texas Machine Rebuilder (Haas spindles)

"Switched from Euro supplier after preload failed tests. YIDI's 7014 pairs ran true at 10k rpm. Landed cost half, delivery beat ETAs. Ordering quarterly now."