General
This is a regular repeat-order project, with approximately one production batch every two months.
Project Overview
This project involved the production of custom Dacromet coated fasteners for an industrial customer in Australia.
The fasteners were manufactured from alloy steel 4140 and produced through precision machining followed by Dacromet surface coating to improve corrosion resistance.
For custom alloy steel fasteners, pins, bolts, shafts, and related components requiring precision machining, heat treatment, hardness control, anti-corrosion coating, batch marking, and dimensional inspection, explore our custom precision metal parts manufacturing capabilities.
Dacromet Coating
Dacromet coating is a zinc-aluminum flake anti-corrosion system applied to steel parts to protect them from rust and environmental degradation.
The coating provides excellent corrosion protection while maintaining precise dimensions because the coating layer is very thin.
Application
Dacromet coated fasteners are widely used in:
- automotive components
- construction equipment
- outdoor machinery
- heavy industrial assemblies
The coating helps extend the service life of fasteners used in harsh environments.
Batch Code
Each fastener was marked with a batch code to support production traceability and after-sales identification. This helps the customer quickly track the production period of each batch and improves quality control for repeat orders.
The batch code system is especially useful for industrial fasteners used in long-term supply programs, where consistent quality and clear production records are required.
In the batch code, “X” represents the production year 2024, while “F” represents July.
Material and Hardness
The fasteners were manufactured from 4140 alloy steel and heat treated to a hardness range of 38–44 HRC. This material combination provides good strength, wear resistance, and stable mechanical performance for industrial fastening applications.
Before production, the raw material was reviewed according to the project requirements to ensure that the chemical composition and mechanical properties met the expected standard.
Surface
The fasteners received a Dacromet coating for improved corrosion resistance and surface protection in automotive and industrial applications.
Protection
Because the Dacromet-coated surface can be damaged by direct contact during handling and transportation, each fastener was individually protected with a plastic mesh sleeve before packing.
This simple but effective protection method helps reduce scratches and coating damage, ensuring the fasteners arrive in good condition after shipment.
For OEM projects involving custom fasteners together with machined parts, washers, nuts, bearings, plastic components, rubber parts, coatings, or assembled kits, explore our broader custom industrial parts manufacturing capabilities.
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Packing
After inspection, the finished fasteners were packed for export shipment. Proper packing is especially important for coated fasteners because it helps prevent surface damage during storage, handling, and transportation.
From production to final packing, we focus on maintaining both product quality and coating condition before delivery.
Conclusion
This repeat-order project shows our capability in manufacturing custom 4140 alloy steel fasteners with Dacromet anti-corrosion coating, hardness control, batch traceability, and protective packing.
For custom alloy steel fasteners, pins, bolts, shafts, and related components requiring precision machining, heat treatment, surface protection, and dimensional inspection, we can support production according to customer drawings and technical requirements.
For OEM projects involving custom fasteners together with machined parts, washers, nuts, bearings, plastic components, rubber parts, coatings, or assembled kits, explore our broader custom industrial parts manufacturing capabilities.
