6308 Bearing: Reliable Deep Groove Performance for Demanding Applications
Sourcing the right 6308 bearing means matching precision to your machinery's real-world loads. From electric motors to conveyor systems, we deliver consistent quality at scale.
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Procurement teams know the drill: a failing bearing can halt production lines overnight. The 6308 bearing, a workhorse deep groove ball bearing, steps in where reliability counts. With inner diameter of 40mm, outer at 90mm, and 23mm width, it's built for moderate to heavy radial loads in everyday industrial setups.
We see it often in purchasing specs—buyers chasing ABEC-1 precision or better, sealed options like 6308-2RS to keep grease in and contaminants out. At YIDI Motion, we've shipped thousands to operations across the US, Europe, and beyond. Not the flashy new tech, but the proven single-row design that handles speeds up to 10,000 RPM without drama.
Think about your setup. Electric motors humming 24/7? Conveyor belts pushing tonnage? Automotive aftermarket rebuilds? This bearing fits. Chrome steel GCr15 construction gives it that edge over softer alternatives, with heat treatment pushing dynamic load ratings to 40.5 kN. We've had engineers call back after installs, noting smoother runs and fewer adjustments.
Market shifts play in too. Rising costs for domestic sourcing push importers toward verified Chinese factories like ours. But it's not just price—it's consistency. Our 6308 bearings meet DIN 625 standards, with vibration levels that stay low even after 10,000 hours. Skip the middlemen; direct from Hebei means you control lead times.
One ops manager from a Midwest plant shared how swapping to our ZZ-shielded version cut downtime by weeks. No more grease leaks or early wear. That's the operational win procurement pros chase: parts that last without over-spec'ing the budget.
Dimensions lock it in: 40x90x23. Tolerances? P0 standard, but we offer P6 for precision fits. Cage? Steel or brass, depending on your heat and speed needs. Open, one shield, two shields, or contact seals—stocked for quick dispatch.
Logistics reality check: FOB Xingang port, containers load 500-800 pieces per 20ft, depending on packaging. We've optimized for palletizing to dodge damage claims. And for US buyers, no duties surprises if you spec correctly.
EEAT matters here. We're not spinning yarns; our factory in Shijiazhuang runs Japan-imported grinders and German spectrometers for material certs. Exports to 50+ countries since 2020, with repeat orders from names you'd recognize in heavy industry.
Compare it quick to 6208: smaller bore, but 6308 takes wider shafts better. Versus 6309? Thinner profile for space-constrained housings. Buyers mix them in assemblies, so we bundle quotes.
Installation snag we've fixed for clients: press-fit without scoring races. Use a proper arbor, heat the housing to 80C. Maintenance? Check radial play yearly; relube with lithium complex if unsealed.
This isn't brochure talk. It's from years dispatching to procurement desks facing tight RFQs. Need CAD drawings? Torque specs? We email them same day.
Global trade quirks: EU folks want REACH compliance; we have it. US? RoHS if electronics-adjacent. Our 6308 lineup covers it, with test reports on request.
Volume buyers note: MOQ 50 pieces for samples, 500 for production runs. OEM stamping your logo? No issue, plates ready. ODM tweaks to clearances? Engineering team iterates fast.
Price bands? Competitive at $2-4/unit bulk, scaling with seals and precision. But lock in now—steel volatility hits everyone.
6308 Bearing Technical Specifications
Exact specs drive decisions. Here's the breakdown for our standard 6308 deep groove ball bearing.
| Parameter | Value |
|---|---|
| Bore Diameter (d) | 40 mm |
| Outer Diameter (D) | 90 mm |
| Width (B) | 23 mm |
| Dynamic Load (Cr) | 40.5 kN |
| Static Load (Cor) | 24 kN |
| Limiting Speed (Grease) | 8500 RPM |
| Limiting Speed (Oil) | 10000 RPM |
| Weight | 0.63 kg |
| Material | GCr15 Chrome Steel |
| Precision Class | P0 / ABEC-1 (P6 available) |
| Seal Options | Open, ZZ, 2RS |
Custom variants? We adjust for high-temp polyamide cages or corrosion-resistant coatings. Data sheets downloadable via inquiry.
Real-World Applications for 6308 Bearings
Versatile pick. Pumps in wastewater plants take the axial hits. Fans in HVAC spin quietly for years.
- Electric Motors: Front/rear shaft supports, handling imbalance.
- Conveyors: Idler and drive pulleys, radial loads from belts.
- Automotive: Wheel hubs, alternators—aftermarket darling.
- Agricultural Machinery: Harvesters, tractors; dust seals critical.
- Power Tools: Grinders, saws; high-speed sealed units.
- Textile Machines: Spindles needing low noise.
Harsh spots? 6308-2RS with nitrile seals shrugs off water splashes. We've supplied lines for US food processors—IP55 equiv.
Advantages of YIDI 6308 Bearings
Price alone doesn't cut it. Our edge: tighter radial clearances from CNC grinding. Less creep under load.
- Lower friction coefficient—saves 5-10% on energy in continuous runs.
- Extended L10 life: 20,000+ hours typical in moderate duty.
- Batch traceability: Lot numbers laser-etched for audits.
- Competitive vs SKF/NSK without the markup.
Table comparison:
| Feature | Standard 6308 | YIDI Premium |
|---|---|---|
| Vibration (ISO) | V3 | V2 |
| Grease Retention | Good | Excellent (2RS) |
| Price per Unit (1000+) | $2.20 | $2.80 |
Procurement tip: Test a sample batch first. We've converted skeptics that way.
Installation Insights
Botch the fit, and life halves. Heat outer ring to 100C max. Use induction heater, not torch—avoids micro-cracks.
6307 bearing 6309 bearing 6306 bearing
Shaft tolerance h6 standard. Measure interference post-cool. Torque locknuts to 20 Nm dry.
Maintenance Realities
Sealed? Run dry 2 years. Open? Relube every 2000 hours with NLGI 2. Listen for growl—early misalignment flag.
Warning: Mismatched pairs fail fast. Match lots for back-to-back duplex.
Ask Our EngineerBuyer Guide: Sourcing 6308 Bearings Right
Risks abound. Unverified suppliers ship undersized bores. Check for forged rings, not stamped.
- Request 52100 equiv cert (our GCr15 matches).
- Audit vibration reports.
- Negotiate Incoterms: CIF for US East Coast.
- MOQ flexibility signals strength.
Our process: RFQ → 24hr quote → Samples 7 days → Production 25 days.
YIDI Motion Factory Capabilities
100 staff, 30% seniors. German Hass grinders, Japan Mitutoyo gauges. ISO 9001:2015 certified.
Exports: USA, Germany, Japan. OEM for linear motion lines too—ball screws pair well with 6308.
Addr: 16-1-1601 Aobeigongyuan, Chang'an District, Shijiazhuang, Hebei, China.
ISO 9001 | RoHS | CE
CNC Grinders | Superfinishers
50,000 pcs/month
Shipping and Logistics
FOB Xingang. 20ft holds 12,000 pcs. Air for urgents: DHL 3-5 days.
US duties: 3.9% on HS 8482.10. LCL options from $200.
Track via our portal post-dispatch.
Request Shipping QuoteWhat Our Buyers Say
Mike R., Procurement Mgr, Ohio USA: "Solid 6308-2RS at half SKF price. Ran 18 months no issues on conveyors. Samples arrived fast—will reorder."
Anna K., Ops Director, Texas: "Good tolerances, low noise. Shipped to Houston in 28 days. OEM stamp perfect for our brand."
John D., Engineer, Canada: "P6 grade lived up to specs. Better grease retention than previous supplier. Logistics smooth."
Carlos M., Mexico Importer: "Bulk 6308 open bearings—quality matched imports. No rejections at border."
Frequently Asked Questions
What's the difference between 6308 ZZ and 2RS?
ZZ metal shields for high speed; 2RS rubber seals for contamination protection. ZZ cheaper, easier relube.
Lead time for 10,000 pcs?
25-30 days post-deposit. Rush options +15%.
Can you do custom packaging?
Yes, branded boxes or bulk polybags.
Minimum order quantity?
100 pcs samples, 1000 production.
Payment terms?
30% T/T advance, 70% B/L copy. L/C for large orders.
Ready to Source Your 6308 Bearings?
Direct factory pricing, samples free for qualified buyers. Let's discuss your specs.
HEBEI YIDI IMPORT AND EXPORT TRADING CO.,LTD. | +86 18134111662 | adam@yidimotion.com
Written by Adam Li, Export Director at YIDI Motion. 10+ years in bearing trade, overseeing OEM exports to North America. Last updated: 2026
