3309 Bearing: Double Row Angular Contact Ball Bearings for Heavy-Duty Applications
Meta Description: Trusted 3309 bearing from Hebei YIDI factory. Double row angular contact design for high axial loads in pumps, machine tools. USA export ready. Get specs, samples, quotes fast.
Table of Contents
- Technical Overview
- Key Applications
- Common Procurement Challenges
- Detailed Specifications
- Buyer Selection Guide
- Installation and Maintenance
- Logistics from China to USA
- Our Factory Capabilities
- Customer Experiences
- FAQs
- Contact for Quote
Procurement managers in the US often hit roadblocks sourcing reliable 3309 bearings. These double row angular contact ball bearings handle combined radial and axial loads better than singles, but finding a supplier with consistent quality, competitive pricing, and fast export logistics isn't straightforward. We've shipped thousands to American machine shops and pump manufacturers over the past few years.
At YIDI Motion, part of Hebei YIDI Import & Export Trading Co., Ltd., we specialize in these for OEM projects. Established in 2020, our factory focuses on linear motion components like ball screws, guides, and bearings. Over 100 employees, with 30% senior technicians, keep production tight. Equipment from Germany and Japan ensures precision.
What sets the 3309 apart? It's a workhorse for moderate speeds and heavy axial duties. Bore 45mm, OD 100mm, width 36mm standard. Contact angle around 40 degrees for thrust handling. We've seen it in centrifugal pumps, conveyor systems, and CNC spindles where downtime costs real money.
Buyers tell us they worry about counterfeit parts flooding markets like Alibaba. Or lead times stretching past 8 weeks. We cut that risk. Stock ready for 3309-B-2Z or open versions. MOQ as low as 10 pieces for testing. Export to 50+ countries, including steady USA runs via ocean or air.
Let's break it down operationally. A purchasing director from a Texas compressor firm once shared how mismatched bearings led to vibration issues, scrapping a whole assembly line shift. Proper 3309 selection fixed it—axial load capacity up to 50kN dynamic. Real-world stuff like that drives our specs.
Technical Deep Dive on the 3309 Bearing
Start with the basics. The 3309 designation follows ISO standards for double row angular contact ball bearings. Inner ring bore diameter 45mm, outer 100mm, total width 36mm. Balls seated in two rows, preloaded for rigidity. This design manages bidirectional axial loads, unlike deep groove types that falter under thrust.
Material? Chrome steel GCr15 standard, hardened to 58-62 HRC. Seals optional—2RS rubber for contamination-prone spots, 2Z metal shields for higher speeds. Lubrication grease-packed, polyurea-based for longevity. We've tested these under 5000 RPM without failure in sims mimicking US factory floors.
Load ratings matter in procurement. Basic dynamic C = 49.6 kN, static Co = 36 kN. Factor in your app's speed and shock. For a 3309-A variant, slightly higher ratings due to lighter preload. Reference SKF or FAG equivalents if cross-checking—3309-B-DT2 or similar.
One engineer noted tolerance classes. P0 normal, P6 for precision tools. We stock both. Misalignment tolerance around 2-3 millirads helps in slightly off-center shafts. Vibration? ISO V good class standard.
Heat? Up to 120°C continuous. Beyond that, synthetic grease swaps recommended. We've handled custom high-temp versions for European oven lines, but USA buyers mostly stick standard.
Where 3309 Bearings Excel: Real Applications
Pumps top the list. Centrifugal types in water treatment or oil skids take axial from impeller thrust. A Midwest fabricator used our 3309 in vertical turbine pumps—cut seal wear by weeks.
Machine tools next. Spindle supports in milling machines. Handles tool pressure without deflection. Distributors report repeat orders from automotive suppliers.
Conveyors and gearboxes too. Agricultural equipment, printing presses. Anywhere moderate OD fits and axial bites.
- Centrifugal pumps: Thrust management
- CNC spindles: Rigidity under load
- Compressors: Vibration damping
- Material handling: Misalignment tolerance
Procurement Pain Points and How We Solve Them
Importers gripe about inconsistent quality. One batch fits, next chatters. Our incoming steel inspection catches that—ultrasonic testing standard.
Lead times kill schedules. Competitors quote 12 weeks; we hit 3-4 for stock, 6 for custom. USA customs? DDP options smooth it.
Pricing volatility. Steel up 20% last year? Locked supplier contracts stabilize ours. Bulk? Tiered: $25/unit under 100, down to $18 over 500.
Risk of fakes. We provide mill certs, traceable serials. No blind faith.
3309 Bearing Specifications Table
| Parameter | Value (3309-B Standard) |
|---|---|
| Bore Diameter (d) | 45 mm |
| Outer Diameter (D) | 100 mm |
| Width (B) | 36 mm |
| Dynamic Load (C) | 49.6 kN |
| Static Load (Co) | 36 kN |
| Speed Limit (Grease) | 5000 RPM |
| Weight | 1.16 kg |
| Seal Options | Open / 2RS / 2Z |
30332 bearing 30209 bearing 32909 bearing
Values per ISO 15:2011. Custom tolerances available. Contact for CAD drawings.
Buyer Guide: Selecting Your 3309 Supplier
Step one: Match load to app. Calc Pu factor. Oversize cautiously—heat builds.
Check certs. ISO 9001:2015 mandatory. We have it, plus RoHS for EU if needed.
MOQ flexibility signals strength. Test small, scale up.
Ask for samples. $50 each, freight collect. Validates fit before bulk.
Logistics plan. FOB Tianjin, CIF LA. 20' container fits 2000+ pcs.
Red flags: No factory pics, vague specs, pressure sales. Stick pros.
Installation Tips from the Field
Press fit inner ring. Heat outer to 80°C max. Align rows parallel. Torque per shaft size.
Lube sparingly first run. Monitor temp first 24hrs. Vibration? Check preload.
Short tip: Never hammer directly. Use sleeve.
Shipping to USA: What to Expect
Ocean: 25-35 days to West Coast. Air: 7-10 days express. Duties? HS 8482.10, 4-6%.
Packing: Bubble wrap, export carton, pallet. No damage claims in 5 years.
Incoterms flexible. Get your shipping plan emailed.
YIDI Factory Strengths
100k sqm facility. CNC grinders from DMG Mori (Germany). Auto assembly lines. 1M bearings/year capacity.
OEM for US brands unnamed here, but think ag equip giants. ODM too—custom cages.
Certs: ISO 9001, CE, RoHS. See factory/factory/5.png for tour.
What Buyers Say
Mike R., Procurement Mgr, Texas Pumps Inc.: "Switched to YIDI 3309 after SKF delays. Same performance, half wait. Samples arrived DHL next week. Solid."
Sarah L., Ops Eng, Ohio Machinery: "Used in spindle rebuild. Handled 4k RPM no issue. Pricing beat domestic by 30%. Repeat coming."
John K., Distributor, CA: "Bulk 500 pcs. Perfect packaging, cleared LA port smooth. Quality matches spec sheet."
Tom H., Project Lead, Midwest Fab: "OEM custom preload worked first time. Saved redesign costs."
Frequently Asked Questions
Q: What's the difference between 3309 and 3209?
3209 is single row, less axial capacity. 3309 doubles up for thrust.
Q: Can you do matched pairs?
Yes, universal 3309-B-2RS-TV for duplex mounting.
Q: Lead time for 100 pcs?
Stock: 1 week. Production: 3 weeks.
Q: USA voltage testing?
Our lab matches 60Hz setups.
Q: Free samples?
Paid, low cost. Refund on order.
Ready for 3309 Bearings?
Talk to our engineer. Get factory pricing, specs PDF, or sample quote.
Phone: +86 18134111662 | Email: adam@yidimotion.com
Addr: 16-1-1601 Aobeigongyuan, Chang'an District, Shijiazhuang City, Hebei Province, China
Request Your Quote Today
Adam Li, Export Director
YIDI Motion | Hebei YIDI Import & Export Trading Co., Ltd.
Over 10 years in linear motion exports. See profile: author/1.png
