Ciso Tool
Ciso Tool
In modern horology, watch size is not merely an aesthetic parameter; it is a critical calculation that governs casing structural integrity, movement clearance, water resistance properties, and ergonomic wearability. For global brands planning OEM/ODM campaigns, sizing configuration represents a complex balancing act between target market demographics, movement dimensions, and component material physics.
Developing a custom timepiece requires configuring multiple concentric and intersecting dimensions:
At Dongguan Ciso Tool Co., Ltd., our multi-station CNC milling setups operate within strict mechanical limits. Case structural calculations must reserve clearance boundaries of at least 0.15mm to 0.25mm between the movement rotor/hand height and the inner surfaces of the case back and sapphire crystal. Hand-setting clearances must not deviate by more than ±0.02mm to ensure fluid operation without physical friction.
| Typical Case Diameter | Movement Compatibility Examples | Standard Lug Width | Recommended Lug-to-Lug | Ideal Application Scenario |
|---|---|---|---|---|
| 36mm | NH35, ETA 2824-2, Miyota 9015 | 18mm | 43.5mm - 45mm | Unisex Classic / Vintage Dress watches |
| 39mm | NH34 (GMT), ETA 2892, Miyota 9075 | 20mm | 46.5mm - 47.5mm | Modern Everyday Sports / Executive GMT |
| 40mm - 41mm | NH35, NH36, Sellita SW200 | 20mm / 21mm | 47.5mm - 49mm | Professional Diver Watches (Sub-Style Bezel) |
| 42mm - 44mm | Valjoux 7750, Smart Sensor PCB Arrays | 22mm / 24mm | 50mm - 52mm | Mechanical Chronographs & Hybrid Wearables |
Global demand is shifting from oversized tool watches back to historic proportions (36mm-39mm). Manufacturers must reduce component wall thickness while retaining high water-resistance ratings through specialized CNC stress testing and engineered gasket geometries.
The rise of active health-tracking rings and hybrid watches requires combining watchmaking finishing methods with RF-transparent windows. Integrating components like ceramic backs or sapphire crystal housings allows sensor signals to pass while maintaining IP68 waterproofing.
All watch cases, straps, and spring bars meant for contact with skin must comply with strict international standards (EU Nickel Directive, REACH, RoHS, California Prop 65). We use medical-grade 316L Stainless Steel, Titanium, and PVD surface processes to prevent allergic reactions.
Dongguan remains the global epicentre of high-precision watchmaking component manufacturing. By leveraging localized supplier ecosystems for precision toolmaking, chemical vapor deposition (CVD) coatings, CNC machinery development, and surface decoration processes, we provide global clients with rapid turnarounds on tooling and production scaling. From prototype drawing validation to batch heat treatment, all key steps are conducted under strict domestic and international quality frameworks.
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.
