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.

6204Z Bearing: Sealed Deep Groove Reliability for Demanding Machinery

Sourcing the right 6204Z bearing isn't just about matching specs on paper. Procurement teams know the headaches when a shielded bearing fails prematurely under load, throwing off production schedules or hiking maintenance costs. We've handled thousands of these orders from our Hebei base, shipping to U.S. distributors and OEM lines in the Midwest. This single-shielded deep groove ball bearing—20mm ID, 47mm OD, 14mm wide—delivers consistent performance in electric motors, pumps, and conveyor systems where contamination is a constant threat.

As export manager at YIDI Motion, I've seen buyers chase cheap imports only to deal with shielding that peels or races that pit after a few months. Our 6204Z units, machined on German-imported grinders, hold up. They're not the flashiest spec, but they keep your lines running without surprise downtime. Let's break down why this bearing fits procurement checklists for American importers focused on ROI.

Common Procurement Pain Points with Shielded Bearings
Key Features of Our 6204Z Bearings
Detailed Technical Specifications
Real-World Applications
Installation and Maintenance Tips
Global Shipping and Lead Times
Why YIDI Motion as Your Supplier
Buyer FAQs
What Importers Are Saying

Procurement Challenges with 6204Z-Style Bearings

I've fielded calls from U.S. operations managers frustrated by bearings that promise "maintenance-free" but deliver vibration issues after 6,000 hours. The Z shield keeps grease in and dust out, but low-grade steel or sloppy tolerances turn that into a liability. Spotty suppliers lead to mismatched batches—your conveyor might spin fine, but the next run seizes.

Lead times stretch when factories overload on standard sizes like 6204Z. We've seen importers pay premiums for rush air freight from Asia, only to find quality dips. And certifications? Many skip RoHS or ISO 9001 verification, risking compliance headaches at U.S. borders.

Shield delamination in humid warehouses.
Inconsistent radial load handling, say 12.8 kN dynamic.
Grease migration causing drag on startup.
Export paperwork delays for bulk pallet orders.

These aren't hypotheticals. Last quarter, a Texas pump assembler switched to us after three failed suppliers. Their downtime dropped noticeably.

What Sets Our 6204Z Bearings Apart

Our version starts with GCr15 chrome steel, heat-treated for hardness without brittleness. The single metal shield snaps on precisely, tested for 10,000 RPM speeds without throw-off. No plastic fillers here—full complement balls maximize contact area.

Buyers appreciate the quiet operation. In fan motors, it cuts noise by reducing cage slap. And for OEMs, we match tolerances to ABEC-3 or better, often P0 as standard.

Pro Tip: Pair with polyurea grease for high-temp apps up to 120°C continuous. Avoids the lithium soap bleed common in budget units.

Volume discounts kick in at 500 units. We've tailored for U.S. distributors reselling to HVAC and ag equipment makers.

6204Z Bearing Specifications Table

Parameter	Value
Bore Diameter (d)	20 mm
Outer Diameter (D)	47 mm
Width (B)	14 mm
Shield	Single side (Z)
Dynamic Load (Cr)	12.8 kN
Static Load (Cor)	6.65 kN
Limiting Speed	18,000 RPM (grease)
Weight	0.106 kg
Material	GCr15 Bearing Steel
Tolerance	P0 / ABEC-1

6203z bearing 6201z bearing 6202z bearing

Values per ISO 15:2011 standards. Custom tolerances available for high-volume OEM.

Where 6204Z Bearings Excel in U.S. Industries

Electric motor shafts in packaging lines. We've supplied runs for Midwest food processors where washdown exposure tests seals daily.

Pump impellers—handles axial loads up to 0.6 times radial without deflection. Ag equipment like irrigation pivots benefits from the compact footprint.

Conveyor idlers. The shield blocks flour dust in bakeries or metal shavings in fab shops. One California distributor noted fewer replacements versus open 6204s.

HVAC fans: Quiet, efficient spin-up.
Power tools: Vibration damping under torque.
Textile machinery: High-speed endurance.
Automotive accessories: Alternators, wipers.

Practical Installation and Maintenance Insights

Press-fit the inner ring first, using a sleeve to avoid shield damage. Heat housings to 80°C max—don't cook the grease. Arbor press over hammer every time.

Lube interval? Every 4,000 hours or annually for dusty sites. Listen for growl on startup; that's preload gone wrong. We've seen engineers skip alignment, leading to 20% shorter life.

Warning: Overtightening shaft nuts binds the shield. Torque to 15 Nm typical.

Storage tip: Vertical racks, away from corrosives. U.S. importers often overlook this, arriving with surface rust.

25520 Bearing

Ready to spec this for your line? Email adam@yidimotion.com for a free installation guide PDF.

Shipping from Hebei to Your Door—U.S. Focused

FOB Xingang port, standard 20' container holds 40,000 units palletized. Air express for samples: DHL 3-5 days to LAX or ORD.

Lead time: 7-15 days stock, 25-35 for custom packs. Duty? HS 8482.10, often under USMCA for re-export. We handle docs—Bill of Lading, CO, packing lists.

No minimums under 100, but pallets optimize freight. Tracked to your warehouse.

YIDI Motion: Proven Factory Strength

Since 2020, our 100-person team in Shijiazhuang cranks out bearings alongside ball screws and linear guides. 30% senior techs oversee Japanese CNC grinders.

ISO 9001 certified, RoHS compliant. Exports to 50+ countries—U.S. gets priority West Coast routing. OEM/ODM? We retool races for your torque specs.

One-stop: Bearings + linear modules for full actuator builds.

Get factory-direct pricing? Call +86 18134111662 or shoot an inquiry.

Frequently Asked Questions from U.S. Buyers

What's the difference between 6204Z and 6204ZZ?: Single vs. double shield. Z suits one-side exposed apps, ZZ for both.
Can you match SKF or NSK specs?: Yes, dimensionally and load-wise. Our radial clearance is C3 standard.
Minimum order for U.S. shipping?: 50 units express, 500 for sea best rates.
High-temp options?: Up to 150°C with special grease, quoted per run.
Returns policy?: 30 days unused, we cover inspected defects.

Feedback from American Importers

Mike R., Operations Manager, Texas Pump Co.: "Switched from Alibaba specials. These 6204Z run cooler, no shield issues after 10k hours. Lead time beat expectations."

Sarah L., Procurement, Ohio HVAC Distributor: "Competitive on price, solid docs for customs. Installed in 200 fans—no callbacks."

Tom K., Engineer, California Ag Equipment: "Tight tolerances, handles dust well. OEM run of 2k went smooth."

Jeff D., Supply Chain, Midwest Conveyor Maker: "Pallet arrived perfect. Performance matches pricier brands without the markup."