各种规格不锈钢.铁材质的圆头内六角螺栓(圆杯)国标.英.制.美制圆杯螺丝.常用规格规格有2x42x52x62x82x102.5x42.5x62.5x82.5x102.5x123x43x53x63x83x103x123x163x203x253x303x353x403x453x504x64x84x104x124x164x204x254x304x354x404x454x505x65x85x105x125x165x205x255x305x355x405x455x506x66x86x106x126x166x206x256x306x356x406x456x506x556x606x656x708x108x128x168x208x258x308x408x458x508x558x608x658x708x758x808x858x908x958x100另外常用规格有20的各种***的圆杯螺丝.可以根据客户的要求定做非标的平头内六角螺栓)