Genuine Sinotruk Bolt 50 Dacromet 805-048-348 – Unsurpassed Corrosion Resistance & Fastening Strength for Howo Trucks

Engineering Excellence Behind the 805-048-348 Dacromet Bolt

The 805-048-348 is not a standard coated bolt – it is a precision-engineered fastener that combines high-strength metallurgy with an advanced Dacromet 50 coating system. The base material is a chromium-molybdenum alloy steel that undergoes controlled quenching and tempering to achieve a tensile strength exceeding 1040 MPa. The Dacromet coating, applied via a dipping and baking process, consists of overlapping zinc and aluminum flakes bonded with a chromate-free inorganic binder, providing exceptional barrier protection and cathodic action.

This coating system offers superior resistance to salt spray, with independent testing confirming over 1000 hours of protection against red rust, far exceeding the 240-hour capability of conventional zinc plating. The 805-048-348 also exhibits excellent resistance to brake fluid, diesel, and hydraulic oil, making it ideal for under-chassis applications where chemical exposure is common.

In a typical Howo truck, the 805-048-348 is used in suspension hangers, axle U-bolt plates, and engine mounting brackets – locations exposed to road spray, mud, and temperature extremes. Its Dacromet coating ensures that the bolt remains corrosion-free, preserving its torque-tension relationship and preventing seizure, which can complicate maintenance and lead to stripped threads.

Technical Specifications – Bolt 50 Dacromet 805-048-348

Parameter	Specification
OEM Part Number	805-048-348
Product Name	Bolt 50 Dacromet (Hexagon flange bolt)
Brand	Sinotruk (Genuine OEM)
Thread Size	M16 x 2.0 (coarse)
Length (under head)	50 mm
Head Type	Hexagon flange, serrated face
Material	Cr-Mo alloy steel (42CrMo4)
Property Class	10.9
Tensile Strength	≥ 1040 MPa
Yield Strength	≥ 940 MPa
Coating	Dacromet 50 (zinc-aluminum flakes, chromate-free)
Corrosion Resistance	≥ 1000 hours salt spray (ASTM B117)
Coating Thickness	8 – 12 µm
Friction Coefficient	0.12 – 0.16 (stable)
Recommended Torque	280 – 320 Nm (oiled)
Application	Suspension, axle U-bolts, engine mounts, chassis brackets
Compatible Models	Howo A7, T7, C7H, HW series; Sinotruk heavy-duty trucks

Why the Genuine Sinotruk 805-048-348 Outperforms Generic Coated Bolts

Generic coated bolts often use simple zinc plating or even just a paint layer, which chips and corrodes quickly under road salt and abrasion. The Dacromet coating on the 805-048-348 is a bonded coating that does not flake off, and its aluminum flakes provide a galvanic barrier that actively protects the steel substrate even if the coating is scratched. This self-healing property is invaluable for vehicles operating in Nigeria’s humid coastal regions where accelerated corrosion is a constant threat.

Moreover, the Dacromet coating offers a stable friction coefficient, which means that the torque-tension relationship remains consistent over the life of the bolt. This allows for accurate preload application during assembly and reduces the risk of either under-tightening or over-tightening, both of which can lead to joint failure. Workshops that use the 805-048-348 report fewer instances of corrosion-related bolt seizures, making disassembly easier and reducing repair times.

Advanced Coating Technology for Extreme Environments

The Dacromet 50 coating on the 805-048-348 is composed of overlapping zinc and aluminum platelets that form a labyrinthine barrier against moisture and ions. Unlike conventional electroplating, this coating does not suffer from hydrogen embrittlement, a common problem with high-strength bolts that can lead to sudden fracture. This makes the 805-048-348 especially safe for critical chassis applications where failure would have severe consequences.

Compatibility and Fitment

The 805-048-348 is a direct replacement for the original bolt in a wide range of Sinotruk and Howo models. Its M16x50 dimensions and 2.0mm pitch are standard for U-bolt plates, suspension brackets, and engine mounts. Always verify the thread class and length before installation, and use a calibrated torque wrench to tighten to the recommended 280–320 Nm when lubricated with clean engine oil.

Explore the full range of genuine Howo Parts available for your fleet, including fasteners, suspension components, and chassis hardware. The 805-048-348 Dacromet bolt is an essential part of that ecosystem – and with Sinotruk’s original quality, you can be confident that every critical joint will remain secure and corrosion-free.

Installation Best Practices for the 805-048-348

Proper installation of the 805-048-348 is essential to preserve its corrosion-resistant properties and ensure correct clamp load. Always clean the bolt and the threaded hole with a solvent to remove any dirt or grease that could interfere with the coating. Apply a thin layer of engine oil to the threads and the flange bearing surface to achieve a consistent friction coefficient. Tighten the bolt in two stages (60% and 100% of final torque) using a torque wrench calibrated for the specific thread size.

During routine maintenance, inspect the 805-048-348 for any signs of coating damage or corrosion. If the coating is visibly scratched, the bolt may still provide protection due to the galvanic action of the zinc/aluminum flakes, but if corrosion is present, replace the bolt with a new 805-048-348 to ensure continued performance.

Built for Nigeria – Unmatched Corrosion Protection in Coastal and Humid Conditions

Nigeria’s diverse climate ranges from the humid, salt-laden air of the coastal regions to the dry heat of the interior. The 805-048-348 with its Dacromet coating is the ideal fastening solution for vehicles operating in these challenging environments. Its superior corrosion resistance ensures that bolts remain removable for service, reducing the risk of costly seized fasteners that can turn a simple repair into a major project.

Furthermore, the coating’s resistance to chemicals and abrasion makes it suitable for use in mining and construction applications where mud, rock dust, and chemical additives are prevalent. By choosing the genuine Sinotruk 805-048-348, fleet operators reduce maintenance costs, improve vehicle reliability, and extend the service life of chassis components.

Protect Your Vehicle with the Genuine 805-048-348 Dacromet Bolt

The 805-048-348 Bolt 50 Dacromet is a small but vital component that offers exceptional protection against corrosion and ensures reliable fastening throughout your vehicle’s service life. Its advanced coating, high strength, and exact OEM fitment make it the definitive choice for professional workshops and fleet managers. Every time you install a genuine Sinotruk 805-048-348, you are protecting your investment and reducing the risk of fastener-related failures.

Don’t compromise with generic coated bolts that may not offer the same level of durability. Insist on the genuine 805-048-348 – the Dacromet bolt trusted by experienced mechanics and fleet operators across Nigeria. With its proven performance in the harshest environments, this bolt delivers the reliability and peace of mind you deserve.

Genuine Sinotruk 805-048-348 – Engineered for excellence. Built for Africa. Trusted by professionals.

Packaging & Shipping

Every Howo part is carefully packaged and shipped to ensure it arrives in perfect condition, ready for installation. Our professional logistics process guarantees timely delivery across Nigeria.

Secure Packaging

Each Howo part is individually wrapped in protective materials and placed in reinforced cardboard boxes to prevent damage during transit.

Dedicated Transport

We use our own Sinotruk logistics fleet for reliable delivery, ensuring parts reach customers quickly and safely across all regions of Nigeria.

Quality Inspection

Before shipping, each part undergoes final quality checks and is clearly labeled with its OEM number for easy identification.

Nationwide Distribution

Our extensive distribution network covers all major cities and rural areas in Nigeria, ensuring prompt delivery to construction sites, workshops, and businesses.

Shipping Information for Nigerian Customers

• Standard Delivery: 3-5 business days to major cities (Lagos, Abuja, Port Harcourt, Kano)

• Express Delivery: 1-2 business days available for urgent orders

• Regional Coverage: We deliver to all 36 states including remote areas

• Tracking: All shipments include real-time tracking information

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