Product Introduction

Structure

This engine cylinder head bolt is a high-strength precision fastener assembly exclusively engineered for heavy-duty diesel engines. It adopts a one-piece forged structure consisting of a cylindrical inner hexagon drive head, a smooth polished shank with precise diameter tolerance, and a full-length high-precision threaded section. The entire component undergoes a black oxide heat treatment finish, presenting a uniform matte black appearance, and the thread pitch strictly complies with OE specifications to ensure a perfect fit with the cylinder block and head.

Performance

Forged from premium 42CrMoA alloy steel and subjected to a full-process quenching and tempering heat treatment, the bolt achieves a tensile strength grade of 12.9, exhibiting exceptional fatigue resistance and yield strength. It can withstand the extreme alternating loads and high combustion pressures inside the engine cylinder, maintaining a stable clamping force of up to 180kN. The black oxide finish provides superior resistance to high-temperature oxidation and engine oil corrosion, and it maintains structural stability in the temperature range of -50°C to 200°C.

Core Function

1. Serves as the core fastening component for the engine cylinder head, providing uniform and ultra-high clamping force to seal the cylinder head, cylinder block, and cylinder gasket tightly.

2. Maintains the airtightness of the engine combustion chamber, cooling water channel, and lubricating oil channel, preventing gas leakage, water leakage, and oil leakage during engine operation.

3. Withstands the huge explosive force generated during fuel combustion and the thermal expansion stress of the cylinder head, ensuring the precise positional relationship between the cylinder head and the cylinder block.

Engine Cylinder Head Bolt 99112520704 Sinotruk – Premium Quality, Factory Direct

When it comes to keeping your Sinotruk engine running safely and reliably, every single fastener matters. The Engine Cylinder Head Bolt 99112520704 is one of those critical components that quietly holds everything together — literally. Designed specifically for Sinotruk heavy-duty engines, this bolt ensures a tight, consistent seal between the cylinder head and the engine block. Without it performing at its best, you risk leaks, overheating, and costly downtime. At Mettlead, we supply this genuine-spec bolt at factory direct prices, so you get OEM-level reliability without the inflated cost.

Why This Engine Cylinder Head Bolt Matters

The cylinder head bolt might seem like a small part, but it plays an outsized role in engine performance. Here is what makes the 99112520704 cylinder head bolt essential for your Sinotruk fleet:

• Secures the Cylinder Head: It fastens the cylinder head firmly to the engine block, maintaining the critical seal that prevents combustion gas leaks and coolant seepage.
• Withstands Extreme Conditions: Engineered from high-strength alloy steel, this bolt resists the intense heat, pressure, and vibration inside a heavy-duty diesel engine.
• Maintains Clamping Force: Precision-threaded to deliver consistent torque and clamping force over time, reducing the risk of head gasket failure.
• OEM-Spec Fitment: Manufactured to match original Sinotruk specifications, so installation is straightforward with no modifications needed.
• Extends Engine Life: A properly sealed cylinder head means stable compression, efficient combustion, and less wear on surrounding components.

In other words, this bolt does not just hold parts together — it protects your entire engine investment.

Application Scenarios

The Engine Cylinder Head Bolt 99112520704 is specifically designed for the following applications:

• Compatible Vehicles: Sinotruk HOWO heavy-duty trucks and related models equipped with matching engine platforms.
• Primary Function: Fastening the engine cylinder head to the block, ensuring a gas-tight and coolant-tight seal across all operating conditions.
• Use Cases: Engine overhaul, cylinder head gasket replacement, routine maintenance during scheduled service intervals, and fleet rebuild programs.

Whether you are managing a long-haul logistics fleet or maintaining mining and construction vehicles, this bolt keeps your Sinotruk engines sealed and performing at peak efficiency.

Technical Specifications

Note: For exact dimensional specifications and torque values, please consult your engine service manual or contact us directly.

OEM/ODM Capability

At Mettlead, we understand that different markets have different needs. That is why we offer flexible OEM and ODM services for the Engine Cylinder Head Bolt 99112520704 and our full range of Sinotruk parts:

• White-Label Packaging: We can supply this bolt under your own brand name with custom packaging that matches your company identity.
• Custom Packaging Solutions: Whether you need bulk industrial packaging for workshops or retail-ready blister packs, we adapt to your requirements.
• Strict Quality Control: Every batch undergoes hardness testing, dimensional inspection, and surface quality checks before shipment.
• Flexible Order Quantities: From small trial orders to large-volume procurement, we accommodate your purchasing schedule.
• Fast, Reliable Delivery: Our streamlined logistics network ensures your parts arrive on time, wherever you are in the world.

As a dedicated supplier of Sinotruk HOWO truck parts, we carry thousands of part numbers in stock and ready to ship.

Frequently Asked Questions

What does the Engine Cylinder Head Bolt 99112520704 do?

This bolt secures the cylinder head to the engine block on Sinotruk engines. It provides the clamping force needed to compress the head gasket, creating a reliable seal that prevents combustion gases and coolant from leaking between the two surfaces.

Can I reuse cylinder head bolts after removing them?

Generally, it is not recommended. Cylinder head bolts — especially torque-to-yield types — stretch during installation. Reusing a stretched bolt can result in uneven clamping force and potential gasket failure. For safety and reliability, always install new bolts during a cylinder head service.

How do I know if my cylinder head bolts need replacement?

Common signs include coolant leaks near the head gasket area, white smoke from the exhaust (indicating coolant entering the combustion chamber), overheating, or loss of compression. If you are performing any cylinder head work, replacing the bolts is standard best practice.

Is this bolt compatible with all Sinotruk engine models?

Part number 99112520704 is designed for specific Sinotruk engine platforms. To confirm compatibility with your exact engine model, we recommend checking your parts catalog or reaching out to our team with your vehicle VIN or engine number.

What torque specification should I use for installation?

Torque values vary depending on the specific engine model and bolt design (standard torque vs. torque-to-yield). Always follow the torque sequence and values specified in your Sinotruk engine service manual to ensure proper and even clamping.

Do you supply other engine fasteners and cylinder head components?

Absolutely. Mettlead offers a comprehensive range of chassis and engine system parts for Sinotruk and other Chinese truck brands. From gaskets and studs to complete overhaul kits, we have you covered.

Ready to Order? Let’s Talk.

Sourcing the right Engine Cylinder Head Bolt 99112520704 for Sinotruk should not be complicated. With Mettlead, you get genuine-spec quality, competitive factory pricing, and a team that understands heavy truck parts inside and out.

Whether you need a small batch for urgent repairs or a bulk order for your warehouse, we are ready to help. Explore our full catalog of Sinotruk truck parts, or go ahead and contact us today to request a quote. Our team typically responds within 24 hours with pricing, availability, and shipping options tailored to your location.

Mettlead — Your Trusted Factory-Direct Source for Chinese Truck Parts Worldwide.