... )Finis:SN,PB,CP,SB,AB,AC,etc 4)Flat head 5)Useful life: more than 0.1 million times Fatory ... *75*2.5mm,100*75*2.0mm;3)Hinge with flat or crown head;4)Fixed or loose pin; 5)Bearings: ball ... )Useful life: used in normal after 0.1 million times10)Hinge bearing weights : Thickness 2.5mm: 30 to 40kg ,3.0mm ... , 2pcs/box and 100pcs or 50 pairs/carton. Iron door hinge with crown head