Secure your critical driveline and engine components with the 612630040144 Hexagon Flange Bolt, a premium high‑strength fastener engineered to deliver reliable clamping force and vibration resistance in the most demanding heavy‑duty applications. This bolt features an integrated flange that distributes load evenly and eliminates the need for separate washers, simplifying assembly and ensuring a leak‑free, secure connection. As a cornerstone of genuine Howo/Sitrak truck parts, the 612630040144 is manufactured to exact OEM specifications, guaranteeing a perfect fit and superior mechanical properties in HOWO, Sitrak, and Shacman powertrains, chassis, and suspension systems. Whether you are performing a transmission overhaul, replacing a cylinder head, or securing a chassis component, this hexagon flange bolt delivers the strength, durability, and precision required to keep your truck operating safely and efficiently, reducing downtime and maintenance costs.
The 612630040144 is not an ordinary bolt; it is a precision‑manufactured fastener that combines a robust hexagon head with an integral flange for superior load distribution and vibration resistance. Manufactured from high‑strength alloy steel (typically 10.9 or 12.9 grade), this bolt is heat‑treated to achieve the optimal balance of tensile strength and ductility. The threads are rolled, not cut, to improve fatigue resistance and provide a smooth, consistent surface for accurate torque application. The flange face is serrated or designed with a specific surface finish to increase friction and prevent loosening under vibrational loads. Every 612630040144 is dimensionally verified to ensure that the head height, flange diameter, thread pitch, and overall length match the original equipment specifications exactly.
The bolt’s integrated flange serves multiple purposes: it eliminates the need for a separate washer, reduces the risk of loose washers during assembly, and provides a larger bearing surface that spreads the clamping load over a wider area, reducing the risk of gasket extrusion or surface indentation. The flange also acts as a locking mechanism, with the serrations or slight angle increasing friction against the mating surface to resist loosening from vibration. This makes the 612630040144 an ideal choice for critical applications such as engine mounts, transmission bell housing bolts, and suspension fasteners.
High Tensile Strength – The 612630040144 is rated to 10.9 or 12.9 grade, providing exceptional clamping force for critical heavy‑duty joints.
Rolled Threads – The thread‑rolling process work‑hardens the material and produces a smoother finish, reducing friction and improving torque accuracy.
Vibration Resistance – The serrated flange face increases friction, preventing self‑loosening in high‑vibration environments.
Integrated Washer – The flange eliminates the need for a separate washer, reducing assembly time and the risk of lost parts.
The 612630040144 is dimensionally identical to the original equipment hexagon flange bolt used across a wide range of HOWO, Sitrak, and Shacman heavy‑duty applications. It is specifically matched to the thread size, pitch, length, and head dimensions required for engine components, transmission housings, axle flanges, and chassis attachments. This bolt is commonly used in WP10, WP12, WP13, and WD615 engine builds, as well as in the assembly of gearboxes, clutch housings, and suspension systems. By choosing this genuine bolt, you eliminate the risks associated with aftermarket fasteners that may have incorrect thread engagement, improper hardness, or poor corrosion resistance, which can lead to joint failure, oil leaks, or even catastrophic component separation.
The 612630040144 has been validated through rigorous testing, including torque‑to‑yield and fatigue cycle simulations, to confirm its performance in real‑world conditions. Fleets that have switched to this OEM bolt report a noticeable reduction in fastener‑related breakdowns and maintenance tasks. Its precise fitment ensures that the correct clamp load is achieved with the recommended torque, eliminating the guesswork and inconsistency often encountered with generic bolts.
Proper installation of the 612630040144 is essential to achieve the designed clamp load and to prevent premature loosening or failure. Begin by cleaning the bolt hole and the mating surfaces to remove any oil, debris, or old sealant. Inspect the threads of the bolt and the hole for any damage; if any are found, replace the bolt or repair the threads. Apply a small amount of thread lubricant (or the lubricant specified by the manufacturer) to the bolt threads and the underside of the flange to achieve accurate torque readings. Do not over‑lubricate, as this can lead to over‑torquing.
Install the bolt and tighten it to the manufacturer’s recommended torque value, typically between 100 and 150 Nm for M10‑M12 bolts, or as specified in the vehicle service manual. Always use a calibrated torque wrench and follow a crisscross tightening sequence when multiple bolts are used. After installation, it is good practice to re‑check the torque after the first heat cycle or after 100 km of operation. Regular inspection of the 612630040144 during routine maintenance is recommended—look for any signs of corrosion, thread damage, or loosening. With proper installation and care, this bolt will provide a reliable, long‑lasting connection.
Each 612630040144 hexagon flange bolt is manufactured in an IATF 16949‑certified facility, ensuring consistent quality and traceability. The raw material is verified for chemical composition and mechanical properties. The forging and heading processes are carefully controlled, followed by heat treatment to achieve the required hardness and strength. The threads are rolled to precise dimensions, and the flange is formed to the correct diameter and thickness. After manufacturing, every bolt undergoes a 100% dimensional inspection, including thread gauge checks, head height, and flange diameter.
Random samples from each batch are subjected to tensile strength testing, hardness testing, and proof load testing to verify that the bolt meets or exceeds the specified grade requirements. A salt‑spray test is also performed to validate the corrosion resistance of the coating. This comprehensive quality regimen ensures that every 612630040144 delivers the same reliable performance as the original OEM fastener, giving you complete confidence in your repair.
Professional mechanics and fleet maintenance teams prefer the 612630040144 because it simplifies their work and guarantees reliable results. The flange design eliminates the need to handle separate washers, speeding up assembly and reducing the risk of missing parts. Its consistent quality means that every bolt provides the same clamp load, eliminating the variability that can lead to joint loosening or gasket failure. Many workshops have reported fewer comebacks due to fastener issues after switching to this OEM bolt.
Moreover, the 612630040144 is available in bulk packs, making inventory management easy. Its clear labeling and traceability ensure that technicians can quickly identify the correct bolt for each application. When you choose this bolt, you are selecting a component that has been engineered and tested to the highest standards, offering the perfect combination of strength, convenience, and reliability.
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