Patent ID: 7641562

Claim:
A boot for a universal shaft coupling formed by a rubber elastic body, and forming a bellows portion between a small-diameter ring portion and a large-diameter ring portion, wherein linear separated portions are formed along a generatrix from the small-diameter ring portion to the large-diameter ring portion, both sides of said separated portions are formed thick, and a fastener pair is arranged in said separated portions, and a portion between said separated portions is thinner than said separated portions and is formed in a substantially uniform thickness so as to form a general portion connected in a peripheral direction, wherein said fastener pair is constituted by a band-like first occluding portion formed along one end edge of said separated portions and provided with a bulge locking portion in a leading end, and a band-like second occluding portion provided with a occluding groove occluding with said first occluding portion along another end edge of said separated portions, and wherein both side cross sections of a base portion of the bulge locking portion in said first occluding portion are formed as angular portions, and both side cross sections of a base portion of a bulge receiving portion in the occluding groove corresponding to said bulge locking portion in said second occluding portion are formed as curved portions compressing said angular portions.