| 摘要 |
A socket body 3 comprises a socket-forming section 4 having a mounting groove 6 around the outer periphery thereof. A cap 7 is integrally formed with a ring-shaped mounting portion 13 through a tether 12. The cap 7 may be mounted on the socket body 3 by engaging the mounting portion 13 in the mounting groove 6. Mounting the cap 7 on the socket body 3 requires no fastening members such as screws, thereby reducing the number of parts thereof and the number of assembly steps in comparison with those which require fastening members.
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