Production Lines
Efficient assembly lines support batch production across a wide range of automotive aftermarket parts.
Reliable Automotive Aftermarket PartsManufacturer Since 1988
Who We Are
Since 1988, Sintly has focused on manufacturing reliable automotive aftermarket replacement parts for global B2B customers.
We specialize in Starter Solenoids, Universal Switches, Relays, Battery Relays, Electromagnetic Valves, Key Switches, and Stop Solenoids, serving wholesalers, distributors, aftermarket brands, importers, and online auto parts sellers worldwide.
Backed by ISO 9001 and IATF 16949 certified quality systems, Sintly provides stable production, strict quality control, and long-term supply support to help customers build dependable aftermarket product lines.
Built Through Decades of Manufacturing
Built Through Decades of Manufacturing
Since 1988, Sintly has grown step by step from a specialized automotive parts manufacturer into a stable production base for global aftermarket customers.
Across decades of factory experience, we have strengthened our capabilities in tooling, assembly, testing, production planning, and order fulfillment. Our factory reflects this long-term accumulation: skilled teams, practical processes, and a manufacturing culture built around consistency.
Today, Sintly continues to move forward with the same focus that shaped our early years: reliable parts, reliable supply, and reliable cooperation.
1988 — Where It Began
Registered as Ruian Xinlin Automotive Electrical Factory in Ruian, Zhejiang.
Manufacturing Capabilities
With decades of manufacturing experience, Sintly has built the capacity, resources, and production systems needed to support global aftermarket customers. From factory operations and skilled teams to tooling development and annual output, our capabilities help customers maintain stable supply and long-term product availability.
12,000㎡ +
Factory Area
200+
Employees
1000+
Product Models
5,000,000+
Annual Capacity
60+
Export Markets
12,000㎡ +
Factory Area
1000+
Product Models
5,000,000+
Annual Capacity
60+
Export Markets
Inside Our Factory
Sintly operates a modern manufacturing facility designed for efficient production, organized inventory management, and consistent quality control.
From raw material preparation and assembly lines to product testing, packaging, and warehouse management, every step is structured to support batch production and on-time delivery for global B2B customers.
Our factory system enables us to manage a wide range of SKUs while supporting stable supply for wholesalers, distributors, aftermarket brands, and online auto parts sellers.
Production Lines
Efficient assembly lines support batch production across a wide range of automotive aftermarket parts.
Warehouse Management
Organized inventory management helps improve order processing efficiency and supply coordination for global customers.
Quality Testing
Structured testing processes help maintain stable product performance and consistent quality.
Packing & Delivery
Standardized packing and shipping processes help protect products and support efficient global delivery.
Laboratory & Testing
Sintly's in-house laboratory supports product development, production control, and final quality verification. With 12 lab technicians, we test key automotive aftermarket parts such as starter solenoids, relays, solenoid valves, ignition switches, alternators, and starters.
Our testing process focuses on electrical performance, mechanical function, durability, fitment stability, and batch consistency. By connecting laboratory results with production improvement, Sintly helps reduce defects, improve reliability, and deliver more dependable auto parts to global customers.
Explore our certifications and patents
