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Ensure smooth, reliable operation in your machinery with the UC317-UC320 Pillow Block Insert Bearing, designed to minimize downtime and maximize performance. Crafted from high-quality bearing steel, this double-row unit handles both radial and thrust loads with precision, making it ideal for demanding applications like rolling mills and mining equipment.
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| Parameter | Details |
|---|---|
| Model Number | 3308A-2ZTN9/MT33, 3308ATN9, 3308DMA |
| Bearing Type | Angular Contact Ball Bearing |
| Specification (d x D x B) | 40 mm x 90 mm x 36.5 mm |
| Material | Bearing Steel |
| Separated | Unseparated |
| Rows Number | Double |
| Load Direction | Radial Bearing, Thrust Bearing |
| Lubrication | Grease or Oil |
| Precision Rating | P0, P6, P5, P4, P2 |
| Vibration | Z1V1, Z2V2, Z3V3 |
| Stock | Rich Stocks |
| Trademark | BDL/NTN/NSK/NMB/Koyo/NACHI/Timken |
| Origin | China |
| HS Code | 8482102000 |
| Industry | Typical Applications |
|---|---|
| Automobile | Transmission systems, wheel hubs |
| Rolling Mill | Roller support assemblies |
| Mine | Conveyor equipment, drilling machinery |
| Metallurgy | Continuous casting machines, rolling equipment |
When equipment downtime hits due to bearing failure, the cost adds up fast—missed production targets, emergency maintenance crews, and replacement parts that never seem to match the original specs. Sourcing the right angular contact ball bearing can feel like searching for a needle in a haystack, especially when dealing with multiple brands and complex dimension standards. As someone who’s worked in industrial supply for years, I’ve seen how the wrong bearing choice leads to premature wear, excessive vibration, and avoidable equipment breakdowns.
The UC317-UC320 Pillow Block Insert Bearing series addresses these challenges head-on. Built with high-quality bearing steel and precision manufacturing, these double-row angular contact ball bearings handle both radial and thrust loads, making them ideal for applications like automobile transmissions and rolling mill machinery. Our ISO 9001-certified production processes ensure each unit meets strict dimensional and hardness standards, while our extensive inventory means you get the parts you need without long lead times. Whether you’re replacing a worn bearing in a mine conveyor or upgrading metallurgical equipment, these bearings deliver the reliability industrial operations depend on.
Angular contact ball bearings excel in applications where combined radial and axial loads are present—think belt drives, gearboxes, and machine tool spindles. The UC317-UC320 series, with its 40 mm bore diameter and 90 mm outer diameter, is specifically engineered to perform under the heavy loads and continuous operation typical in mining and metallurgical settings. The unseparated design ensures structural integrity during high-speed rotation, while vibration ratings (Z1V1 to Z3V3) allow customization based on noise and precision requirements. Choosing the right bearing isn’t just about dimensions; it’s about matching the bearing’s load capacity and tolerance to your equipment’s exact needs.
Three critical specifications set these bearings apart: material quality, precision rating, and lubrication flexibility. Constructed from high-grade bearing steel, they offer superior hardness and wear resistance compared to lower-quality alternatives, directly reducing the risk of early fatigue failure. Precision ratings from P0 (standard) to P2 (high precision) ensure compatibility with everything from general industrial machinery to precision equipment. The ability to use either grease or oil lubrication adds versatility—grease for sealed applications with minimal maintenance access, oil for high-temperature or high-speed environments. Together, these features translate to longer bearing life and reduced maintenance intervals.
It’s tempting to opt for cheaper bearings to save upfront costs, but the hidden expenses tell a different story. A bearing with subpar material hardness or imprecise dimensions can cause excessive shaft wear, misalignment, and even damage to adjacent components. In contrast, the UC317-UC320 series, with its strict quality control and adherence to international standards, minimizes these risks. Properly selected angular contact ball bearings distribute loads evenly, reducing stress on equipment and extending overall system life. When you factor in fewer replacements, less downtime, and lower maintenance labor, investing in quality bearings actually lowers your total cost of ownership over time.
Our commitment to quality starts with raw material inspection and continues through every stage of production. Each bearing undergoes dimensional checks, hardness testing, and surface finish analysis to ensure compliance with specifications. We stand behind our products with a warranty covering manufacturing defects, giving you confidence in your purchase. With access to both our own brand and major international brands like NTN, NSK, and Koyo, we can source or supply bearings that meet your exact requirements—whether you need a standard off-the-shelf model or a custom solution. Our 100% on-time delivery rate and responsive customer service (typically under 0.5 hours) mean you won’t be left waiting when time is critical.
Don’t let bearing issues slow down your operation. Whether you need to replace an existing UC317-UC320 Pillow Block Insert Bearing or source a specific model like 3308A-2ZTN9/MT33, we can help. Provide your required model number, dimensions, or application details, and our team will confirm availability, pricing, and delivery options. The sooner you reach out, the sooner we can get your equipment back to peak performance.
Q: Can you supply bearings from other brands besides those listed?
A: Yes, we support procurement of bearings across all major international and domestic brands. Simply provide the brand and model, and we’ll source it for you.
Q: How do I confirm if this bearing fits my equipment?
A: Share your equipment’s make, model, or the bearing’s critical dimensions (bore, outer diameter, width), and our technical team will verify compatibility.
Q: What is your warranty policy for these bearings?
A: We offer a warranty against manufacturing defects. Specific terms and duration are outlined in each sales contract.
Q: What is the minimum order quantity for this bearing?
A: We accept low minimum orders, including single units for emergency repairs, as well as large-volume purchases.
Q: How long does shipping take, and what methods are available?
A: In-stock items ship immediately. Shipping time depends on method: express (1-3
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In-house team provides application design, failure analysis, and predictive maintenance -- reducing bearing failures by 35%.
Every product undergoes rigorous pre-shipment inspection with full documentation for traceability and compliance.
Dedicated account managers and reliable delivery networks ensure on-time supply for enterprise clients worldwide.
Performance Metrics
35%
Failures Prevented
70%
Downtime Reduction
25+
Years Experience
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Quote Response
78% of large enterprises prefer suppliers offering integrated technical support and lifecycle services.
Custom bearing selection and system design based on your specific load conditions, speeds, temperatures, and environmental factors.
Root-cause investigation of bearing failures using metallurgical testing, vibration analysis, and operating data review.
IIoT-enabled monitoring with smart sensor bearings for real-time vibration, temperature, and RPM tracking.
Modified bearings with special coatings, seals, tolerances, or materials. Lead time 8-12 weeks from official channels.
Certified engineers available for on-site installation support, alignment checks, and commissioning assistance worldwide.
Long-term service agreements including regular maintenance checks, replacement scheduling, and performance reporting.
Free samples available for orders over $50K
Validated against your KPIs before full production commitment.
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