LD-370 Steel Brass Butt Hinge Ball Bearing Parliament Piano | Wholesale Supplier

The LD-370 steel and brass hinge collection is a comprehensive range of architectural door hardware encompassing butt hinges, ball bearing hinges, parliament wide-throw hinges, and piano continuous hinges, each engineered to deliver reliable door operation across residential, commercial, and industrial environments. Manufactured from premium materials including steel, stainless steel 304, solid brass, brass-plated steel, and steel ball bearings, the collection offers builders, contractors, and hardware distributors a versatile single-source solution for virtually any door hanging requirement. Butt hinges in 3-inch (75mm), 4-inch (100mm), 5-inch (125mm), and 6-inch (150mm) sizes cover standard interior and exterior residential and commercial doors, while ball bearing variants reduce pin friction and wear for heavy doors and high-traffic installations. Each hinge is produced under strict ISO 9001 quality controls and tested to ANSI/BHMA and EN 1935 performance standards.

Ball bearing hinges represent the premium tier of the LD-370 collection, featuring precision steel ball bearings between the knuckle joints that dramatically reduce rotational friction and pin wear. This design is essential for heavy doors, doors fitted with door closers, and high-frequency commercial and institutional openings where conventional plain-bearing hinges would quickly develop sag, squeak, and premature failure. Parliament hinges, with their wide-throw projection geometry, allow doors to open fully clear of deep door frames, architraves, and reveals, making them the preferred choice for renovation projects where existing frame configurations limit standard hinge reach. The piano and continuous hinges, available in lengths from 30cm to 180cm, distribute load evenly along the entire door or lid edge, eliminating hinge-point stress concentration and providing exceptional structural support for cabinet doors, storage chests, piano lids, and long access panels.

The LD-370 collection is offered in eight popular finishes to coordinate with any architectural scheme: polished brass, satin nickel, polished chrome, antique brass, oil-rubbed bronze, black, galvanized silver, and satin stainless. Plate thickness ranges from 1.5mm to 3.5mm and knuckle diameters from 10mm to 15mm, providing the structural rigidity needed for doors of varying weight and usage intensity. These finish and dimension combinations make the collection suitable for an exceptionally broad range of applications, from classic residential interiors to demanding commercial entryways, marine environments requiring stainless steel corrosion resistance, and heritage restoration projects needing antique or oil-rubbed bronze aesthetics. The solid brass and stainless steel 304 options deliver inherent corrosion resistance for outdoor, coastal, and humid bathroom installations.

For wholesale buyers and OEM projects, the LD-370 hinge collection delivers exceptional value through competitive factory-direct pricing, extensive customization, and reliable global logistics. Mixed orders across hinge types, sizes, and finishes are fully supported, allowing distributors to build comprehensive inventory from a single supplier. Customization options include OEM logo stamping, custom finishes, special hinge sizes and knuckle counts, stainless steel 304 material upgrades, and keyed or non-removable pin configurations for enhanced security. Hinges are packaged individually in polybags or color boxes complete with mounting screws, with 20 to 100 pairs per carton. With a minimum order quantity of 500 pairs and a production lead time of 15 to 25 days, the LD-370 steel and brass hinge collection provides the quality, versatility, and supply reliability that professional buyers demand.