Hager Full Mortise, Spring, Single Acting Hinge 1250 4.5" x 4.5" US26D

features: full mortise spring, single acting, square corner hinge steel with steel components (ansi k81071f) single acting spring hinges are for automatic closing of door. they meet codes for hotels, motels, institutions, and commercial buildings. 1250 is available with raised barrel for straight or beveled doors. 1250 approved for use on 4" 0" x 8" 0" (1219 x 2438 mm) doors. for maximum versatility, use all spring hinges or a combination of spring and ball bearing hinges. Do not use plain bearing hinges. full spring tension may not be required on all hinges. strong wind conditions, drafts, carpeting drag, twisted/misaligned frames, or weatherstripping on doors may require additional spring hinges