Ciso Tool
Ciso Tool
Direct manufacturer integration for synthetic sapphire lenses, custom watch blanks, and ultra-high stability quartz tuning forks.
In modern horology and instrumentation, the selection of protective windows is critical. Synthetic sapphire (Single Crystal Alumina, Al₂O₃) stands out due to its hardness, second only to diamond. Rated at Mohs Hardness 9, sapphire crystals offer unprecedented scratch resistance and pristine optical transmission.
Unlike standard mineral glass, sapphire possesses excellent thermal conductivity, resistance to chemical etching, and a refractive index of approximately 1.76. These characteristics make it the gold standard for luxury watches, smart wearables, and industrial optical equipment operating in harsh environments.
We utilize advanced Kyropoulos crystal growth methods to guarantee ultra-high purity, minimizing structural dislocations and internal stress, which ensures optimal clarity for double-domed and custom-shaped optics.
Advanced physical vapor deposition (PVD) vacuum systems apply multi-layered anti-reflective (AR) coatings (single-sided or double-sided) to eliminate reflections and optimize light transmission up to 99%.
Diamond-tool machining and chemical-mechanical planarization (CMP) techniques achieve dimensional tolerances down to ±0.01 mm and surface roughness (Ra) below 0.2 nm.
| Property | Synthetic Sapphire (Al₂O₃) | Mineral Glass (Tempered) | Acrylic (PMMA) |
|---|---|---|---|
| Mohs Hardness | 9 Mohs | 6.5 Mohs | 3 Mohs |
| Refractive Index | 1.76 - 1.77 | 1.52 | 1.49 |
| Compressive Strength | 2.0 GPa | 0.15 GPa | 0.08 GPa |
| Transmission Range | 150 nm to 5500 nm (UV to Mid-IR) | 350 nm to 2500 nm | 300 nm to 1000 nm |
Dongguan Ciso Tool Co., Ltd. was founded in 2006 and is a professional manufacturer specializing in the research, development, and production of mid-to-high-end precision watch components and complete watch solutions. Formerly operating under an earlier corporate structure, the company has grown into a modern manufacturing enterprise with strong integrated capabilities across design, engineering, and precision production.
The company operates an independent industrial facility covering over 20,000 square meters and employs more than 500 skilled staff members, including a dedicated R&D team of over 60 professionals. With advanced production equipment, strict quality control systems, and experienced technical personnel, Ciso is committed to delivering high-precision, high-consistency products for global watch brands.
Ciso focuses on the R&D and manufacturing of premium watch accessories, including watch dials, watch cases, watch straps, watch buckles, and precious metal components such as 18K gold watch parts and fine jewelry accessories. In addition, the company provides full ODM and OEM services, supporting complete watch customization from concept design and prototyping to mass production and assembly.
Guided by the principle of "Quality First, Integrity Supreme," Ciso emphasizes excellence in every production process. The company implements rigorous quality assurance protocols, ensuring that each product meets international standards for durability, precision, and aesthetic refinement.
Through consistent quality and reliable service, Dongguan Ciso Tool Co., Ltd. has established long-term partnerships with well-known domestic brands and continues to expand its presence in global markets. The company is committed to honest cooperation, mutual growth, and long-term value creation with international watch brands, striving to elevate the artistry and innovation of modern watchmaking.
Why Dongguan's manufacturing cluster offers unparalleled efficiency, raw material security, and cost advantages for global watch brands.
Our Dongguan facilities integrate the entire lifecycle: raw ingot slicing, rough shaping, fine edge polishing, chemical coating, and final cleanroom inspection, preventing margin stacking and reducing lead times by 35%.
All watch components comply with REACH, RoHS, and NIHS (Swiss watchmaking industry standards). Our quality systems are audited annually under ISO 9001:2015 frameworks to guarantee international reliability.
We operate dedicated local logistics support and technical hubs in main luxury sectors, facilitating customs clearance, VAT compliance, and direct delivery to assembly lines across Switzerland, Hong Kong, and Germany.
Precision watch crystals are no longer limited to classic horology. Our components serve across various technical domains:
Ensuring sub-micron precision through advanced multi-axis machining, drilling, and quality testing systems.
Procurement directors face three primary hurdles when sourcing watch components globally: dimensional yield reliability, continuity of raw material supply, and traceability compliance. Inconsistencies in chemical coatings or crystal orientation can cause high failure rates during automated assembly. Our strict adherence to statistical process control (SPC) ensures consistent quality for large production batches.
Additionally, the transition to smart wearables requires specialized crystal engineering. Touch displays require high-performance anti-fingerprint (AF) coatings, chemical tempering, and precise mechanical cutouts for integration with heart rate sensors and battery systems.
Our vertical integration model lowers total cost of ownership (TCO) by reducing transit damage and streamlining supply chains under a unified quality control structure.
Research into ceramic-matrix composites, multi-color synthetic sapphires, and integrated micro-LED lens coverings are paving the way for future smartwatch interfaces.
The demand for miniature 32.768kHz SMD resonators is rising. High precision and low ESR values are crucial for IoT, energy-efficient smartwatches, and medical systems.
Find answers to common questions about manufacturing tolerances, material selection, and custom orders.
Optical performance is defined by transmission levels, birefringence, and surface finish (scratch-dig rating). High-end sapphire uses a 60/40 or 40/20 scratch-dig standard and anti-reflective (AR) coatings to reduce reflection down to less than 1% across visible light wavelengths.
The quartz tuning fork resonators utilize the piezoelectric property of natural or synthetic quartz. Vibrating at a constant 32,768 cycles per second, it provides a stable frequency reference. Our manufacturing ensures low ESR (Equivalent Series Resistance) and minimal aging rates (+/- 3ppm in the first year).
With our CNC grinding and diamond polishing lines, we achieve dimensional tolerances of +/- 0.01 mm on thickness and outer diameter, and +/- 0.02 mm for complex steps, chamfers, or curved profiles on domed crystals.
We use raw materials that undergo testing by independent laboratories like SGS. We certify that all components, including adhesives, sapphire blocks, and metallization layers, are lead-free and free from SVHCs (Substances of Very High Concern).
Yes, we offer Physical Vapor Deposition (PVD) to apply metallic coatings along the crystal rim, including gold, silver, rose gold, and deep black. This provides a clean aesthetic seal for luxury and mechanical timepieces.
Industrial-grade watch glass, custom sapphire case components, and miniature resonators for electronic PCBs.
