In modern global manufacturing, standardizing procurement while addressing application-specific requirements is a key operations metric. For heavy industry, automotive assembly, electronics, and construction, procuring fasteners in bulk is no longer just about buying individual components. Procurement managers face the challenge of managing multiple SKUs, tracking quality metrics, and ensuring assembly lines have the exact components they need.
This is where ODM Assorted Nuts and Bolts Kits come in. Instead of sourcing, inspecting, and packaging thousands of individual screws, nuts, washers, and bolts, global enterprises are shifting toward pre-sorted, customized kit solutions. As an experienced ODM manufacturer, we provide custom assortments, specialized compartment layouts, tailored corrosion-resistant coatings, and complete compliance documentation. This helps simplify logistics, reduce manufacturing errors, and lower the Total Cost of Ownership (TCO).
Established in 2006, Sinsun Hardware has grown into a leading manufacturer and global supplier of high-quality fasteners. Operating from our 30,000 square meter facility in Northern China, we handle large-scale global demands. Our infrastructure includes modern production zones, a 12,000 square meter smart warehouse with an 18,000+ pallet capacity, and multi-language customer support centers.
We export more than 8,500 containers annually, servicing key global markets across the Middle East, Southeast Asia, South America, and Russia. Sinsun manages over 20,000 SKUs of nails, screws, wires, and rivets. Our production processes combine German-engineered multi-station cold heading machinery with precision Taiwanese technology, supported by a trained technical staff.
Every batch of fasteners undergoes 12+ strict quality checks. This ensures dimensional accuracy of ±0.02mm, surface finish of Ra ≤ 0.4μm, tensile strength of 1,000+ MPa, core hardness of HRC 28-32, and salt spray corrosion resistance exceeding 1,000 hours.
Quality begins at the source. Sinsun partners with Xingtai Steel to source high-grade steel rods. Our factory utilizes gas-fired spheroidizing annealing furnaces to ensure uniform microstructure, preparing the metal for cold heading.
Using German multi-station cold heading machines and Taiwanese tooling, we achieve dimensional accuracy down to ±0.02mm. Our specialized tail-gripping process ensures consistent performance in self-tapping screws.
With 4 advanced heat treatment lines running continuously, we manage thermal cycles to achieve core hardness of HRC 28-32. This provides structural durability without causing hydrogen embrittlement.
Our industrial fasteners are manufactured to meet demanding engineering specifications. We test every production run to ensure compliance with global standards, including ISO, DIN, ANSI, and GOST.
| Metric Parameter | Tested Specification Value | Industrial Standard Significance |
|---|---|---|
| Dimensional Tolerance | ±0.02 mm | Ensures compatibility with high-speed automated assembly lines. |
| Surface Roughness (Ra) | ≤ 0.4 μm | Reduces friction and prevents thread galling during high-torque installations. |
| Salt Spray Test Resistance | 1,000+ Hours (Specialized Coatings) | Long-term resistance to marine, chemical, and outdoor environments. |
| Tensile Strength | 1,000+ MPa | Meets high-stress demands in structural and heavy machinery applications. |
| Core Hardness | HRC 28-32 | Provides balanced load-bearing capacity and impact resistance. |
Since our founding in 2006, Sinsun has evolved from a local manufacturing workshop into an international fastener supplier.
Sinsun was established with a clear mission: to build a modern production facility focused on self-tapping screws. This early specialization helped lay the groundwork for our manufacturing expertise.
We expanded our reach internationally by establishing a dedicated Export Department. Sinsun's self-tapping screws began entering global construction and industrial markets.
To improve quality control, we added four spheroidizing annealing furnaces and built an in-house wire drawing workshop. This allowed us to monitor and control quality from the raw wire stage.
We upgraded our production line with German multi-station cold heading machinery. At the same time, we expanded our product offerings to include a variety of specialized drill tail screws.
Production capacity scaled significantly, reaching 36,000 tons annually. Sinsun fulfilled over 1,100 export containers, expanding our footprint in global logistics.
To ensure faster delivery, we expanded our storage capacity to include a 1,200-square-meter ready-stock area alongside our main 12,000-square-meter warehouse system.
We added four new heat treatment lines, allowing us to manage hardening cycles in-house. This investment has helped improve consistency, product durability, and lead times.
A quality kit starts with careful configuration. We use 3D structural modeling to design box partitions that keep components securely organized during transport and use.
Fasteners face a variety of working environments. Sinsun offers tailored surface treatments to protect your kits against corrosion and wear.
To ensure consistent quality across production runs, Sinsun applies a systematic 12-step inspection process. This protocol tracks material properties, tolerances, and performance from receipt to final shipment.
Managing international logistics requires strict adherence to customs, safety, and packaging regulations. Sinsun's experienced export department works to ensure shipments are fully compliant.
