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The genuine Five‑Stroke universal joint with specification 39*118 is engineered to provide exceptional torque transmission, angular flexibility, and long‑term durability for SINOTRUK Sitrak heavy‑duty trucks. Designed to precise dimensional standards, this 39X118 universal joint connects driveline components with minimal backlash, ensuring smooth power transfer even under extreme angles and high loads. As a critical rotating component within the Sinotruk sitrak parts portfolio, the 39*118 Five‑Stroke universal joint guarantees factory‑grade fitment, superior wear resistance, and the reliability required for millions of operating cycles.
The 39*118 Five‑Stroke universal joint is not a generic cross‑and‑bearing assembly; it is a precision‑engineered component manufactured to exacting tolerances for SINOTRUK Sitrak driveline systems. Featuring high‑strength alloy steel crosses, case‑hardened bearing cups, and premium needle rollers, this 39X118 U‑joint withstands torsional loads up to 5,500 Nm while accommodating angular misalignment up to 15 degrees. Its optimized geometry reduces vibration and eliminates driveline shudder, ensuring smooth power delivery from the transmission to the rear axle.
Fleet data from Sitrak operators confirms that using the genuine 39*118 universal joint reduces driveline failure rates by over 65% compared to aftermarket alternatives. The precision‑ground needle rollers and hardened trunnions maintain tight tolerances throughout the joint’s life, preventing premature wear and eliminating the need for frequent lubrication. For fleet managers, this translates into reduced unscheduled downtime, lower maintenance costs, and extended driveline component life.
Forged 42CrMo4 steel cross with induction‑hardened trunnions handles up to 5,500 Nm of continuous torque, suitable for heavy‑haul applications.
Case‑hardened bearing cups (58–62 HRC) and precision‑ground needle rollers minimize friction, extending service life by up to 50%.
Factory‑filled with premium lithium grease and sealed with double lip seals, eliminating the need for periodic lubrication.
| Parameter | Specification |
|---|---|
| OEM / Spec Number | 39*118 / 39X118 |
| Product Type | Five‑Stroke Universal Joint (Cross & Bearing) |
| Brand | SINOTRUK Sitrak Original Equipment |
| Application | Sitrak C7H, C9H, TX series – Driveshaft, Steering Linkage |
| Cross Diameter | 39.0 mm ±0.02 mm |
| Total Length (cap to cap) | 118.0 mm ±0.3 mm |
| Bearing Cup Diameter | 43.5 mm ±0.02 mm |
| Material | Cross: 42CrMo4 forged steel; Cups: 100Cr6 bearing steel |
| Hardness (trunnion / cup) | 58–62 HRC induction hardened / case hardened |
| Max. Operating Angle | 15 degrees (continuous) / 25 degrees (intermittent) |
| Torque Capacity | 5,500 Nm (static) / 4,200 Nm (dynamic) |
| Weight | 1.65 kg (approx.) |
When replacing the universal joint with the genuine 39*118 unit, always ensure the driveline is properly supported. Remove the retaining rings using appropriate snap‑ring pliers, then press the bearing cups out using a hydraulic press or U‑joint press tool. Clean the yokes thoroughly and inspect for wear or distortion. Install the new joint by pressing the cups evenly, ensuring the needle rollers remain centered. Secure with new retaining rings and verify smooth rotation without binding.
During routine maintenance, inspect the universal joints for any signs of play, rust, or seal damage. A slight rotational play indicates wear and should be addressed immediately to prevent driveline damage. Using the genuine 39*118 universal joint ensures that the bearing cups are precisely sized to the yoke, eliminating slop that can lead to accelerated wear. For vehicles operating in harsh environments, consider inspecting joints every 50,000 km to maintain optimal driveline integrity.
Every 39*118 Five‑Stroke universal joint is manufactured in IATF 16949 certified facilities, with 100% dimensional inspection and 100% hardness verification. Each joint undergoes dynamic balancing and torsional fatigue testing to ensure it meets or exceeds original equipment specifications. The needle rollers are precision‑ground to ISO Grade 3 standards, and the bearing cups are 100% inspected for surface finish and roundness. Counterfeit joints often use soft steel and substandard rollers, leading to rapid wear and catastrophic failure; the genuine 39*118 guarantees safety, reliability, and full SINOTRUK warranty coverage.
Aftermarket universal joints frequently use lower‑grade steel for the cross and bearing cups, resulting in premature brinelling and wear. Many non‑original joints also lack proper heat treatment, causing the trunnions to wear rapidly and develop play within months of installation. In contrast, the genuine 39*118 features induction‑hardened trunnions and case‑hardened bearing cups that maintain their geometry for the life of the joint. Additionally, aftermarket joints often omit the rubber seals or use inferior materials, allowing contamination ingress that accelerates failure.
By choosing the original 39*118 Five‑Stroke universal joint, you eliminate the risk of driveline vibration, sudden joint failure, and costly towing expenses. The genuine part carries a unique production code for traceability, ensuring compliance with Sinotruk’s warranty requirements. For any fleet operating SINOTRUK Sitrak trucks, investing in the 39*118 universal joint is an investment in driveline reliability, driver safety, and long‑term value.
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