Product Introduction

• Structure: Single-row cylindrical roller bearing with NUP design. Features an outer ring with double integral ribs, an inner ring with one integral rib plus one detachable loose rib ring, high-precision cylindrical rollers, a steel cage, and a black oxide anti-corrosion finish.

• Key Dimensions:

• Inner diameter (d): 45 mm

• Outer diameter (D): 100 mm

• Width (B): 25 mm

• Minimum corner radius (r₁ₘᵢₙ): 5 mm

  • Material & Treatment: Manufactured from high-carbon chromium bearing steel (GCr15). Raceways and rollers are precision-ground and heat-treated to a hardness of HRC 60–64for exceptional wear and fatigue resistance.

Core Function

1. Radial Load Support: Bears heavy radial loads generated by the countershaft/intermediate shaft during gear meshing and power transmission.

2. Bi-Directional Axial Location: Prevents axial displacement of the shaft via the NUP-type rib structure, ensuring precise gear alignment.

3. Shaft Support & Guidance: Maintains the concentricity of the countershaft, reducing vibration and extending the service life of gears and other bearings.

Cylindrical Roller Bearings NUP309E AZ9003320309 – SINOTRUK HW Series Gearbox

When your SINOTRUK HW Series gearbox demands peak performance under heavy loads, every single component matters — especially the bearings that keep everything turning smoothly. The Cylindrical Roller Bearings NUP309E AZ9003320309 is precision-engineered to handle the extreme radial forces inside your HW transmission, ensuring longer service life and reduced downtime for your fleet. Whether you are maintaining a single truck or managing hundreds of heavy-duty vehicles, this gearbox bearing delivers the reliability your operations depend on. At Mettlead, we supply this part directly from the factory, which means you get genuine quality at a competitive price — without the middleman markup.

Key Features and Benefits of NUP309E AZ9003320309 Cylindrical Roller Bearings

So, what makes this particular cylindrical roller bearing stand out for your SINOTRUK HW gearbox? Let’s break it down:

• High Radial Load Capacity: The NUP309E design features full-complement cylindrical rollers that distribute radial forces evenly, which significantly extends bearing life even under constant heavy-duty stress.
• Precision-Machined Tolerances: Each bearing is manufactured to strict dimensional standards, ensuring a perfect fit within the HW series gearbox housing — no modifications needed.
• Superior Heat Resistance: Built to withstand the elevated temperatures generated inside a working transmission, this bearing maintains its structural integrity even during prolonged highway operation.
• Low Friction Design: The optimized roller-to-raceway contact reduces internal friction, which translates into smoother gear shifts and improved fuel efficiency for the entire drivetrain.
• Corrosion-Resistant Materials: High-grade bearing steel with surface treatment protects against moisture and contamination, a critical advantage in harsh operating environments.
• Direct OEM Replacement: Part number AZ9003320309 matches the original SINOTRUK specification exactly, so installation is straightforward and hassle-free.

In other words, this bearing doesn’t just fit — it performs. And for procurement managers focused on minimizing total cost of ownership, that performance translates directly into fewer replacements, less labor, and more uptime.

Technical Specifications

Accurate specifications are essential when you’re sourcing gearbox bearings for a large fleet. Below, you’ll find the detailed parameters for the Cylindrical Roller Bearings NUP309E AZ9003320309:

Application Scenario: Where Does This Bearing Fit?

The Cylindrical Roller Bearings NUP309E AZ9003320309 is specifically designed for the SINOTRUK HW Series Gearbox — one of the most widely used heavy-duty transmissions across Chinese-brand commercial vehicles. Here’s where it belongs:

• Compatible Gearbox Models: HW19710, HW19712, HW15710, HW13710, and other HW series variants
• Applicable Truck Models: SINOTRUK HOWO A7, HOWO T7H, SITRAK C7H, SITRAK C5H, and other models equipped with HW transmissions
• Function: Supports the intermediate shaft and output shaft within the gearbox, absorbing radial loads generated during gear engagement and power transfer
• Operating Conditions: Long-haul highway transport, heavy construction haulage, mining logistics, and urban distribution — any scenario where the transmission faces sustained or shock loads

If your vehicles rely on the HW series gearbox, this bearing is not optional — it’s essential. And when it wears out, replacing it promptly prevents cascading damage to gears, shafts, and the gearbox housing itself. For more gearbox parts and components, or to browse our full SINOTRUK HOWO gearbox parts catalog, feel free to explore our categories.

OEM/ODM Capability and Custom Packaging

At Mettlead, we understand that different markets have different requirements. That’s precisely why we offer flexible options beyond standard supply:

• White-Label Packaging: Need to sell under your own brand? We provide neutral or custom-branded packaging for the NUP309E AZ9003320309 cylindrical roller bearings, complete with your logo, part numbers, and language preferences.
• Custom Packaging Solutions: Whether you require individual blister packs for retail or bulk industrial cartons for workshop distribution, we’ll tailor the packaging to match your channel.
• Strict Quality Control: Every batch of bearings undergoes dimensional inspection, hardness testing, and surface finish verification before shipment. We maintain full traceability from raw material to finished product.
• Flexible MOQ: We accommodate both trial orders and bulk procurement. This makes it easy to test the market before committing to large volumes.
• Factory Visits Welcome: We invite procurement managers to visit our facilities in China, inspect production lines, and verify quality systems firsthand.

Explore our full range of SINOTRUK HOWO truck parts and spare parts to see what else we can supply for your fleet.

Customer Case Study: NUP309E AZ9003320309 Bearing for African Fleet Operator

Earlier this year, a fleet management company based in East Africa reached out to Mettlead with a recurring problem. Their 60-truck SINOTRUK HOWO fleet was experiencing frequent gearbox failures during long-haul routes, and investigation pointed to premature bearing wear — specifically, the cylindrical roller bearings in the HW gearbox intermediate shaft position.

After reviewing their technical requirements, we supplied 200 pieces of the Cylindrical Roller Bearings NUP309E AZ9003320309 for their SINOTRUK HW Series Gearbox overhaul program. The bearings were delivered within 12 days via sea-air combined shipping, and our team provided installation guidance documentation in both English and French to suit their maintenance crew.

The result? Within three months of replacement, the client reported a 40% reduction in unplanned gearbox maintenance across the fleet. They subsequently placed a follow-up order for 500 pieces and expanded their procurement to include other HW gearbox components from our catalog. Their procurement director noted that the combination of factory-direct pricing, consistent quality, and responsive communication made Mettlead their preferred long-term supplier for SINOTRUK gearbox bearings.

Frequently Asked Questions (FAQ)

What is the NUP309E bearing type, and how does it differ from NU309E?

The NUP309E is a cylindrical roller bearing with a flanged inner ring and a snap ring groove on the outer ring. Compared to the NU309E (which has no flange on the inner ring), the NUP type can accommodate slight axial loads in one direction in addition to radial loads. This makes it especially suitable for gearbox shaft positions where minor axial thrust occurs during gear engagement.

Is the AZ9003320309 bearing compatible with all SINOTRUK HW gearbox models?

Yes, the AZ9003320309 is the standard OEM part number used across the HW series gearbox family, including HW19710, HW19712, HW15710, and HW13710 variants. However, we always recommend confirming your specific gearbox model and shaft position before ordering to ensure a perfect match.

How long does the NUP309E AZ9003320309 cylindrical roller bearing typically last in service?

Under normal operating conditions with proper lubrication, this bearing can last between 200,000 and 400,000 km depending on load severity, driving habits, and maintenance intervals. Replacing transmission oil at recommended intervals and avoiding prolonged overloading will maximize bearing lifespan.

What causes premature failure of gearbox cylindrical roller bearings?

The most common causes include contaminated or degraded transmission oil, misalignment during installation, excessive axial preload, and sustained overloading beyond the rated capacity. If you’re seeing repeated failures, it’s worth inspecting the gearbox housing bores and shaft surfaces for wear or damage that could affect bearing seating.

Can I order a small quantity for testing before committing to bulk procurement?

Absolutely. Mettlead supports trial orders so you can verify fit, quality, and performance in your specific application before scaling up. Many of our long-term clients started with a sample order of 10–50 pieces.

Do these bearings come with any quality certification or test reports?

Each shipment can be accompanied by dimensional inspection reports and material certificates upon request. Our quality control process includes hardness testing, surface roughness measurement, and roller diameter consistency checks — all documented for your records.

Ready to Source Your SINOTRUK HW Gearbox Bearings?

Stop wasting time with inconsistent suppliers and uncertain quality. Whether you need 10 pieces or 10,000, Mettlead delivers Cylindrical Roller Bearings NUP309E AZ9003320309 for your SINOTRUK HW Series Gearbox with factory-direct pricing, rigorous quality assurance, and fast global shipping.

Get your quote today — simply tell us your required quantity, preferred delivery method, and destination. Our team typically responds within 24 hours with pricing and lead time.

Contact us now to request a quote for NUP309E AZ9003320309 Cylindrical Roller Bearings →

Mettlead — Your factory-direct source for SINOTRUK, HOWO, SITRAK, SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON truck parts. Reliable quality, competitive pricing, global delivery.