Product Introduction

The 30312 tapered roller bearing (part number 190003326236) is a high-precision rolling element bearing manufactured from premium high-carbon chromium bearing steel, adhering to strict OE standards for Sinotruk HOWO applications. Unlike standard needle bearings, this unit features a tapered structural design consisting of a precision-ground inner ring (cone), outer ring (cup), tapered rollers, and a cage assembly—optimized to withstand combined radial and axial loads, a critical requirement for heavy-duty truck drivetrain components. The bearing undergoes a full-process heat treatment, including quenching and tempering, to achieve a hardened raceway surface (HRC 60-64) and excellent core toughness, preventing brittle fracture under impact loads. Its precision-machined roller and raceway contact surfaces ensure minimal rolling friction, while the anti-separation cage design maintains roller alignment even during high-speed rotation. This bearing is dimensionally calibrated to the 30312 standard, with strict control over clearance and runout tolerances, ensuring seamless integration with HOWO’s axle and differential components.

Core Function

• Withstands combined radial loads (from vehicle weight) and unidirectional axial loads (from acceleration, braking, and cornering) in heavy-duty truck drivetrain systems.

• Reduces rotational friction between moving components (e.g., differential shafts, wheel hub spindles) to optimize power transmission efficiency and minimize energy loss.

• Maintains precise positional alignment of rotating parts within the axle/differential assembly, preventing abnormal vibration and premature wear of mating components.

• Resists impact, fatigue, and wear under extreme operating conditions (e.g., full-load transportation, uneven road surfaces) to extend the service life of the entire drivetrain.

Needle Roller Bearing 190003326236 | 30312 Sinotruk – Heavy-Duty Precision for Reliable Drivetrain Performance

When your Sinotruk heavy truck demands smooth, friction-free power transmission, every single component in the drivetrain matters. The Needle Roller Bearing 190003326236 (30312 Sinotruk) is engineered to handle extreme radial loads while keeping rotational friction to an absolute minimum. Sourced directly from our factory in China, this bearing delivers the durability and precision that fleet managers and procurement professionals expect — without the inflated middleman pricing.

At Mettlead, we specialize in supplying genuine-equivalent parts for SINOTRUK, HOWO, SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON heavy trucks. Whether you are maintaining a single vehicle or managing a fleet of hundreds, this needle roller bearing keeps your trucks rolling and your maintenance costs down.

Key Features and Benefits of Needle Roller Bearing 190003326236

This isn’t just another bearing sitting on a shelf. The 30312 Sinotruk needle roller bearing is purpose-built for the demanding operating conditions found in Chinese-brand heavy-duty trucks. Here’s what sets it apart:

• High Load Capacity: The needle roller design distributes radial loads across a larger contact area, allowing the bearing to handle heavier forces without premature wear.
• Reduced Friction: Slim, elongated rollers minimize contact resistance between transmission components, which translates directly into smoother operation and better fuel efficiency.
• Compact Envelope: Needle roller bearings occupy less radial space than conventional ball bearings, making them ideal for tight drivetrain assemblies where every millimeter counts.
• Extended Service Life: Manufactured with hardened bearing steel and precision-ground surfaces, this bearing resists fatigue and maintains dimensional stability over hundreds of thousands of kilometers.
• Direct OEM Replacement: Part number 190003326236 ensures a drop-in fit for specified Sinotruk applications — no modifications, no guesswork.

In other words, this bearing works quietly behind the scenes so your trucks stay on the road and your bottom line stays healthy.

Application Scenarios

The Needle Roller Bearing 190003326236 is specifically designed for the following applications:

• Compatible Vehicles: Sinotruk HOWO heavy-duty trucks and related SINOTRUK platform vehicles.
• System Location: Installed within the rear axle and transmission drivetrain assemblies where it bears radial loads and reduces rotational friction between moving components.
• Functional Role: Supports load-bearing shafts, reduces energy loss in power transmission, and protects mating surfaces from metal-to-metal contact.

If your vehicle’s drivetrain is producing unusual noise, vibration, or increased operating temperature, a worn needle roller bearing is often the culprit. Replacing it promptly prevents cascading damage to gears, shafts, and housings.

Explore more compatible components in our Rear Axle Parts Category or browse the full Sinotruk HOWO Truck Parts catalog.

Technical Specifications

Note: Dimensions and tolerances conform to OEM specifications for part number 190003326236. If you need detailed dimensional drawings, please reach out to our team.

OEM/ODM Capability

We understand that different markets have different requirements. That’s exactly why Mettlead offers flexible manufacturing and packaging solutions for the Needle Roller Bearing 190003326236:

• White-Label Packaging: Receive bearings in neutral packaging, ready for your own branding and distribution channels.
• Custom Packaging: We can print your logo, part numbers, and brand identity directly on the box — helping you build recognition in your local market.
• Strict Quality Control: Every batch undergoes dimensional inspection, hardness testing, and surface finish verification before it leaves our facility.
• Bulk Order Flexibility: Whether you need 50 pieces or 5,000, our production capacity scales to meet your demand without sacrificing lead time.
• Factory Visits Welcome: We encourage procurement managers to visit our facility in China, inspect production lines, and build confidence in our supply chain firsthand.

For a comprehensive overview of all Sinotruk-compatible parts we carry, visit our Sinotruk Truck Parts hub page.

Frequently Asked Questions

What is the function of Needle Roller Bearing 190003326236 in a Sinotruk truck?

This needle roller bearing sits within the drivetrain assembly — typically in the rear axle area — where it supports rotating shafts under heavy radial loads. Its primary job is to reduce friction between moving transmission components, which helps maintain efficient power delivery and prevents overheating.

How do I know when this needle roller bearing needs replacement?

Common signs include increased drivetrain noise (a grinding or humming sound), elevated operating temperatures near the rear axle, unusual vibration during acceleration, or visible play in the shaft when inspected during maintenance. If you notice any of these symptoms, replacing the bearing promptly can prevent more expensive damage downstream.

Is this bearing an exact fit for my Sinotruk HOWO truck?

Yes. Part number 190003326236 (model 30312) is manufactured to match OEM dimensional and performance specifications for compatible Sinotruk HOWO vehicles. It drops directly into the original housing without any modification required.

What material is the Needle Roller Bearing 190003326236 made from?

It is manufactured from GCr15 chrome bearing steel — the same high-carbon chromium alloy used in premium automotive bearings worldwide. This material offers excellent hardness, fatigue resistance, and dimensional stability under sustained loads.

Can I order this bearing with my own brand packaging?

Absolutely. Mettlead supports both white-label (neutral) and fully custom-branded packaging. Simply share your artwork and specifications, and we will produce packaging that aligns with your brand identity.

What is the typical lead time for bulk orders?

For standard stock items, we typically ship within 3–7 business days. Larger custom orders may require 10–15 days depending on quantity and packaging requirements. We always confirm exact timelines before you commit.

Ready to Secure Your Supply?

Procurement decisions shouldn’t be complicated. You need the right part, at the right price, delivered on time — and that’s precisely what Mettlead delivers.

Whether you’re sourcing a single Needle Roller Bearing 190003326236 (30312 Sinotruk) for an urgent repair or building a long-term supply agreement for your workshop or distribution business, our team is ready to provide competitive pricing and reliable logistics.

Take the next step:

• Request a quote with your required quantity
• Ask about volume discounts and custom packaging
• Confirm compatibility with your specific vehicle model

Contact Us Now to get a fast, no-obligation quote from our parts specialists. We typically respond within 24 hours.