GGG-B-490F, FEDERAL SPECIFICATION: BLOCKS, TACKLE (MANILA AND NYLON ROPE) (13-APR-1992) [SUPERSEDED BY A-A-59807, A-A-59808, AND A-A-59809]

GGG-B-490F, FEDERAL SPECIFICATION: BLOCKS, TACKLE (MANILA AND NYLON ROPE) (13-APR-1992) [SUPERSEDED BY A-A-59807, A-A-59808, AND A-A-59809]., This specification covers single, double, and multiple sheave tackle blocks for use with manila and nylon rope.