LD-304 Aluminum Alloy Hydraulic Door Closer Adjustable Speed | Wholesale Supplier

The LD-304 aluminum alloy hydraulic door closer delivers smooth, controlled door closing for fire-rated, commercial, and residential doors where reliable automatic closure is essential for safety, security, and energy efficiency. Its die-cast aluminum alloy body houses a precision hydraulic oil mechanism that damps the closing motion, eliminating door slamming while ensuring the door latches securely every time. The independently adjustable closing speed and latch action allow installers to fine-tune the sweep and final latch stroke, accommodating door weights from 60 to 80 kilograms and widths up to 1000 millimeters for versatile application across office, hospitality, healthcare, and residential environments.

Built for demanding daily use, the LD-304 features a steel hydraulic arm and steel mounting bracket that work together to withstand hundreds of thousands of operating cycles without leakage or performance degradation. The aluminum alloy body is lighter than cast iron alternatives while retaining excellent structural rigidity, simplifying handling and installation without sacrificing durability. Five finish options including black, gold, bronze, silver, and white are applied through powder coating or anodizing, providing a corrosion-resistant surface that complements a wide range of door hardware and architectural styles. Surface-mounted installation is straightforward, with a supplied mounting template and screws enabling accurate positioning on wood, metal, and aluminum frame doors.

Wholesale buyers, importers, and contractors benefit from a minimum order quantity of 100 pieces and a 15 to 25 day production lead time, making the LD-304 suitable for project supply, retrofit programs, and retail distribution. OEM and ODM services support logo branding on the body cover, custom closing force and speed curves, custom body colors, and smart closer development with sensor integration for access control systems. Mixed orders across the LD hardware range are supported, enabling distributors to consolidate shipments and reduce logistics costs. Each closer is individually packed in a color box with mounting template and screws, while custom branded packaging with installation manuals supports retail-ready presentation. CE, ISO 9001, and EN 1154 certifications confirm consistent quality and code compliance for global markets.