LD-305 Cast Iron Floor Spring Floor Hinge Glass Door Hydraulic | Wholesale Supplier

The LD-305 Cast Iron Floor Spring is a concealed, floor-mounted hydraulic floor hinge engineered to deliver smooth, controlled, and automatic double-action door movement for heavy glass doors in commercial and high-traffic environments. At its core sits a dense cast iron body that provides exceptional structural stability and vibration absorption, allowing the mechanism to support substantial door weights without shifting or walking over years of continuous service. The internal hydraulic oil mechanism regulates closing and latching speeds through a precision-machined steel cam and bearing assembly, ensuring that doors return to the closed position silently and securely every time, regardless of the direction from which they were opened.

A polished stainless steel cover plate conceals the recessed body, creating a clean, flush finish that complements modern frameless glass entrances while protecting the hydraulic internals from dust, moisture, and accidental impact. The double-action design permits the door to swing through in both directions and automatically self-center, making the LD-305 ideal for busy retail entrances, hospital corridors, and restaurant kitchen passageways where bidirectional traffic flow is constant. Adjustable speed and latch valves let installers fine-tune the closing curve to suit door weight and prevailing air-pressure conditions, preventing both dangerous slamming and the nuisance of doors that fail to latch fully.

Manufactured under strict ISO 9001 quality controls and tested to EN 1154 performance benchmarks, the LD-305 is built for a long service life with minimal maintenance, typically exceeding 500,000 operating cycles. A durable brass or copper seal preserves hydraulic integrity and prevents oil leakage even under fluctuating ambient temperatures. Wholesale buyers benefit from competitive factory-direct pricing, flexible OEM customization including logo engraving, custom cover finishes, and tailored closing-force configurations, and reliable global logistics support. Whether you are outfitting a single flagship storefront or specifying hardware for a large-scale commercial project, the LD-305 cast iron floor spring delivers the durability, safety, and refined performance that professional installers and facility managers demand.