Partially rotated fastener

A fastening system comprising a pair of semi-cylindrical body parts which may be brought together in face to face relationship to form a cylindrical fastener which is symmetrical about a center axis of rotation, said cylinder having a predetermined height measured along said axis, first and second mutually perpendicular annular key flanges integrally formed on each body part adjacent one end thereof, each of said flanges having a thickness which is much less than said height, said first annular key flange extending away from said body perpendicularly with respect to said axis, said second annular key flange extending parallel to said axis, a plurality of object parts to be fastened together along predetermined surfaces thereof, each object part having an arcuate semi-cylindrical raceway formed therein with internal raceway contours which are exactly complementary to the external contours on said fastener body parts, and the raceways in said object parts fitting together to form a single composite cylindrical raceway when said object parts are brought together in a mating face to face relationship, whereby said two body parts of said fastener span and join said semi-circular raceways to securely interconnect said two object parts when said fastener is partially rotated.