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.

30202 to 30220 Tapered Roller Bearings

Metric Single-Row Precision for Heavy Radial and Axial Loads in Industrial Machinery

Sourced direct from our Hebei factory – OEM ready, ISO compliant, exporting to USA and beyond.

YIDI Motion tapered roller bearing production line

Request Factory Quote Download Full Specs PDF

Li Wei, Export Director at Hebei YIDI Import & Export Trading Co., Ltd.
With 12 years in bearing export, I've handled thousands of orders for metric tapered rollers to North American buyers. This guide draws from real procurement talks.

• Why Procurement Managers Turn to 30202-30220 Sizes
• Common Risks in Sourcing Tapered Roller Bearings
• Our 30202 to 30220 Solution: Specs and Fit Guide
• Real-World Applications Across Industries
• Factory Capabilities at YIDI Motion
• Logistics from China to USA: What to Expect
• Buyer Checklist for Reliable Suppliers
• FAQs from Purchasing Teams
• What USA Importers Say

Procurement Risks That Hit Hard with Tapered Roller Bearings

I've seen it too often. A purchasing manager orders 30210 bearings for a gearbox rebuild, only to find inconsistent cone-to-cup clearances causing early failures. Tolerances off by microns, and suddenly downtime costs run into thousands.

Or worse, material quality issues. Low-grade steel flakes under load, especially in high-vibration setups like construction equipment. One Midwest importer told me last year they scrapped a full pallet after vibration tests failed – all because the supplier skimped on carburizing heat treatment.

Risks stack up fast:

Lead time delays from unverified factories – 12 weeks turns into 20.
Freight surcharges on poor packing, bearings arriving chipped.
Mismatched standards; European DIN specs don't always align with ANSI for US rebuilds.
Hidden MOQ traps locking you into excess inventory.

Short story: Skip the Alibaba roulette. Direct factory ties cut these headaches. We've shipped 30202 to 30220 series to over 50 countries without a single return claim.

Quick Tip: Always request dynamic load ratings C and Co verified against ISO 281. Mismatched ratings kill warranties.

30202 to 30220 Tapered Roller Bearings: Our Proven Solution

These metric single-row tapered rollers handle combined radial and axial loads better than ball bearings in demanding spots. The 30202 starts small at 15mm ID for compact actuators; 30220 scales to 100mm ID for truck axles. All use GCr15 high-carbon chrome steel, through-hardened to 58-62 HRC.

Contact angles around 14-18 degrees optimize for thrust. Separate cone (inner ring + rollers) and cup (outer ring) allow precise preload setup – critical for spindle tools or conveyor drives.

We've optimized production for US buyers: Pre-greased options with lithium complex NLGI 2, polyurea cages for high-speed runs up to 10,000 rpm on smaller sizes.

Bearing No.	d (mm)	D (mm)	T (mm)	Dynamic C (kN)	Static Co (kN)
30202	15	35	15.25	22.4	20.8
30203	17	40	17.25	28.1	26.5
30204	20	47	19.25	39.1	36.9
30205	25	52	18	42.8	41.5
30206	30	62	21.25	61.3	64
30207	35	72	24.75	82	87.5
30208	40	80	23	87.5	94
30209	45	85	24.75	95.5	103
30210	50	90	24.75	103	115
30211	55	100	27.75	124	140
30220	100	180	41.25	340	390

taper roller bearing roller slewing bearing roller bearing

Note: Full range available; values per ISO 355/DIN 720. Custom preloads on request.

These aren't off-the-shelf generics. Our batches undergo ultrasonic cleaning, rust-proof oiling, and 100% dimension checks with CMM machines imported from Japan.

Talk to Engineer for Custom Fit

Where 30202-30220 Excel in the Field

Agricultural tractors lean on 30208 for front axles – handles mud, shock loads. In steel mills, 30215 pairs take roll stands, enduring 200°C peaks.

USA contractors favor them for:

Wheel hubs in off-road vehicles (30212 common).
Pump shafts in oilfields (30207 for misalignment).
Conveyor idlers (30204 light duty).
Wind turbine yaw drives (larger 30220).
Precision lathes (30202/03 micro fits).

One tip from installs: Pair with ABMA class 4 shafts for longest life. Misalign by 4 arc-minutes? Expect brinelling.

30202 To 30220 Tapered Roller Bearing

30210 tapered roller bearing in automotive axle application

YIDI Motion Factory: Built for Export Reliability

Since 2020, our Hebei base runs 100 staff, 30% senior techs. German grinders, Japanese grinders ensure bore tolerances to P6 class standard.

OEM/ODM full service: Match Timken or SKF profiles if needed. Monthly output 50,000 units across linear motion and bearings.

Exports hit USA, Germany, Canada – 20ft containers optimized at 15 tons net, no damage claims in 3 years.

Contact: +86 18134111662 | adam@yidimotion.com | Shijiazhuang, Hebei, China

Shipping 30202-30220 to USA: Timeline and Costs

FOB Xingang port, 25-35 days to LA/NY via ocean. Air for samples: 5-7 days DHL.

Packing: Individual boxes, master cartons on plywood pallets. Vibration-proof foam separators.

Expect $0.02-0.05/unit freight on volume. Duty? Usually 2.5% HTS 8482.20.00.

Pro tip: Consolidate with ball screws for lower per-unit ship costs.

Procurement Checklist for Tapered Bearings

Verify ABEC/ISO precision class (P0 standard).
Request grease analysis sheet.
Audit factory via video call.
Negotiate 30% deposit, balance on B/L.
Test 3% sample batch first.
Confirm cage material – brass beats steel for speed.

Common Pitfall: Overlooking end-play adjustment. Use dial indicator; .001-.003" typical for ag equipment.

Get Your Free Sample Kit

FAQs from USA Purchasing Teams

What's the MOQ for 30202-30220?: 10 pieces per size for stock; 500+ for custom. Flexible for trials.
Can you match competitor dimensions exactly?: Yes, to ISO 355. Send prints for reverse engineering.
Lead time for 1000 units mixed sizes?: 4-6 weeks production + ship.
Any warranties?: 12 months or 10,000 hours, whichever first. Claims honored via replacement.
OEM labeling possible?: Full service – your logo, packaging.

What Importers Are Saying

John Ramirez, Texas Equipment Supplier: "Switched to YIDI's 30212 for forklift axles. Half the price of NTN, same run life. Delivered clean, no rejects."