LD-372 Cast Iron Floor Spring Floor Hinge Heavy Duty | Wholesale Supplier

The LD-372 cast iron floor spring is a heavy-duty, concealed, floor-mounted hydraulic floor hinge engineered to deliver smooth, controlled, and automatic double-action door movement for glass and metal swing 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 up to 150kg without shifting or walking over years of continuous service. A polished stainless steel 304 top cover plate conceals the recessed body, creating a clean, flush finish that complements modern frameless glass entrances and metal door installations while protecting the hydraulic internals from dust, moisture, and foot traffic. The double-action design permits the door to swing through in both directions and automatically self-center, making the LD-372 ideal for busy retail entrances, office lobbies, and public building doorways. Each unit is manufactured under strict ISO 9001 quality controls and tested to EN 1154 and GB 2697 performance standards.

The internal hydraulic oil mechanism regulates closing and latching speeds through precision brass adjustment valves, ensuring that doors return to the closed position silently and securely every time, regardless of the direction from which they were opened. The LD-372 is rated for EN size 3 to EN size 5 closing force, accommodating maximum door weights from 80kg to 150kg and maximum door widths from 950mm to 1100mm. A selectable hold-open function engages at either 90 degrees or 105 degrees, allowing the door to remain open for convenient passage of goods, equipment, or high pedestrian traffic before automatically releasing to close. The body is available in two standard dimensions, 250x115x55mm and 290x130x65mm, paired with top plates of 270x120mm or 310x140mm respectively, providing installers with the flexibility to match the floor preparation and door specification of each project. The brass adjustment valves offer on-site fine-tuning of the closing curve.

The LD-372 is offered in four finishes to coordinate with surrounding door hardware and architectural schemes: satin stainless, polished stainless, bronze, and gold. The stainless steel 304 top plate delivers inherent corrosion resistance for outdoor, coastal, and humid bathroom installations, while the bronze and gold options provide warm, decorative aesthetics for heritage and hospitality interiors. These finish and dimension combinations make the LD-372 suitable for an exceptionally broad range of applications, from commercial retail storefronts and shopping mall glass entrances to hotel lobby bidirectional swing doors, hospital corridor passage doors, restaurant kitchen swing passageways, and office building lobby entrances. The heavy-duty cast iron construction and substantial closing force ratings ensure reliable performance on the largest and heaviest swing doors, where lighter-duty floor springs would fail prematurely. The slam-free hydraulic dampening enhances occupant safety and comfort in every setting.

For wholesale buyers, hardware distributors, and OEM projects, the LD-372 cast iron floor spring delivers exceptional value through competitive factory-direct pricing, extensive customization, and reliable global logistics. Mixed orders across body sizes, closing force sizes, and finishes are fully supported, allowing buyers to consolidate their floor spring sourcing through a single supplier. Customization options include OEM logo engraving on the top plate, custom top plate finishes, tailored closing force configurations for specific door weights, and 90 or 105 degree hold-open selection. Each unit is packaged in an individual foam-padded color box complete with an installation template, with 4 to 10 pieces per carton. With a minimum order quantity of 100 pieces and a production lead time of 20 to 30 days, the LD-372 cast iron floor spring and floor hinge provides the quality, durability, and supply reliability that professional buyers and facility managers demand.