Abstract: Hydraulic fittings for use in high pressure hydraulic couplings are provided. The fittings include a body of a hard material such as steel or stainless steel and having an externally threaded portion that terminates in a frusto-conical nose defining a frusto-conical sealing surface, a circumferential groove provided in the sealing surface, and an annular seal received in the groove and comprised of a more malleable material than said hard material, wherein a portion of the annular seal extends beyond the sealing surface such that the annular seal deforms to closely conform to an internal frusto-conical sealing surface of a complementary fitting used in the coupling to provide a fluid seal between the fittings.