National 4 In. Oil Rubbed Bronze 1/4 In. Radius Spring Door Hinge Duro Maximum pressure: 150 PSI at

Maximum pressure: 150 PSI at 125

This synthetic mineral is very hard but fractures easily

can help provide effective particulate filtration on the job

making it spherically perfect which provides precise contact between the ball and seats

including saddle and back-to-back bends

National 4 In. Oil Rubbed Bronze 1/4 In. Radius Spring Door Hinge Duro Maximum pressure: 150 PSI atCatalog model No. V521 series. Cold rolled steel. Designed for hanging self closing doors in basements, stairways, garages, and entrances. Can be used in residential, commercial, and apartment buildings. Hinge is UL approved for fire doors. Closing speed is adjustable. Fits standard hinge cutout. 1 4' radius, round corner automatic door closing spring hinge.