Black Stainless Steel Screws
Products Description
Our black stainless steel screws are essentially a "functional aesthetic identifier" that integrates mechanical fastening functionality with visual design language and surface protection performance.
The "core" of mechanical performance: Its core remains high-quality stainless steel (such as 304 and 316), inheriting its excellent mechanical strength, toughness, and corrosion resistance.
The "language" of visual design: The deep, matte black allows it to perfectly blend into dark backgrounds or create an elegant contrast with light-colored materials, becoming a precise visual element in the hands of designers.
The "outer armor" of surface performance: Its black surface is not simply paint, but a ceramicized film tightly bonded to the substrate, formed through physical vapor deposition (PVD) technology. This "outer armor" endows it with wear resistance, scratch resistance, and chemical corrosion resistance far exceeding that of stainless steel itself.
Manufacturing Advantages: A Closed-Loop Manufacturing System for Surface Engineering
Substrate Pretreatment
High-purity 316 stainless steel (99.9%) is activated by plasma to enhance oxidation activity.
Gradient Oxidation Process
Three-stage oxidation is performed in a controlled atmosphere (150℃/4h → 250℃/2h → 350℃/1h).
Oxide Layer Verification
Each stainless steel countersunk bolt is inspected by XPS (X-ray photoelectron spectroscopy) to confirm the oxide layer thickness and structure.
AI Quality Closed-Loop
A machine learning model based on oxide layer data optimizes oxidation parameters in real time.
Application Scope: Shining in Every Field Pursuing Excellence
High-end Consumer Electronics
Housing mounting for laptops, smartphones, and wearable devices.
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Photography and Optical Equipment
Structural connections for cameras, tripods, gimbals, and telescopes.
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Automotive and Motorcycles
Interior panels for luxury cars, custom modification parts, and exterior components for motorcycles.
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Luxury Goods and Precision Furniture
Hardware for high-end watches, leather goods, and designer bags, as well as stainless steel grub screws for designer furniture.
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Marine and Outdoor Equipment
Deck accessories for high-end yachts, precision fishing rods, carabiners, etc., combining stringent corrosion resistance with aesthetics.
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Technical Features – In-Depth Engineering Analysis Beneath the Black Surface
| "Sandwich" Design of Coating Structure and Performance | For PVD coatings, we often employ multi-layer or gradient structure designs. For example, a base layer with extremely strong adhesion to the stainless steel substrate is deposited first, followed by a functional layer providing the main hardness and color, and the outermost layer may be an extremely thin lubricating or hydrophobic surface layer. |
| Control of Color Consistency and Batch Stability | Maintaining complete consistency in the black hue of stainless steel button head bolts from different batches and specifications is a significant technical challenge. We achieve this through fully automated, closed-loop controlled PVD reactors or chemical processing lines. Process parameters such as gas flow rate, temperature, voltage, and time are precisely controlled and recorded by PLC, ensuring a high degree of consistency in the surface chemical composition, crystal structure, and thickness of each batch of products. |
| Systematic Mitigation of Hydrogen Embrittlement Risk | High-strength stainless steel faces the risk of hydrogen embrittlement due to hydrogen absorption during traditional processes such as pickling and electroplating. Our PVD process is carried out entirely in a vacuum or inert atmosphere, completely avoiding the introduction of hydrogen. Our high-temperature chemical blackening process, with a processing temperature far exceeding the hydrogen diffusion and escape temperature, also ensures that the finished stainless steel button head screws are free from hydrogen embrittlement. |
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