Patent ID: 7427181

Claim:
A composite drain bolt comprising, in combination, a threaded metal sleeve being closed at one end and having a radially extending sleeve flange at the other end, and a non-circular bore extending axially from said sleeve flanged end, a core portion filling said bore portion of said sleeve, said core portion having a stub flange axially adjacent and of larger diameter than said sleeve flange, said core portion also having a head portion shaped to receive a wrench, said core portion being made from a glass-filled thermoplastic resin, and an exterior flange extending radially from and at least partially covering at least two sides of said stub flange, said exterior flange including a circumferential sealing bead extending axially away from the remainder of said exterior flange and said head portion, said exterior flange being made from a material which includes cross-linked elastomer particles dispersed in a thermoplastic carrier.