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GGG-B-490 Revision F, April 13, 1992
Complete Document
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Includes all amendments and changes through Cancellation Notice 1, December 9, 2008
Additional Comments: CNCL REFER TO A-A-59807, A-A-59808, A-A-59809
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This specification covers single, double, and multiple sheave tackle blocks for use with manila and nylon rope.

The blocks shall be of the following types and styles, as specified (see 6.2):
    Type I   - Nontoppling blocks.
    Type II  - Ordinary blocks.
    Type IIa - Blocks, tackle (awning pulley).
    Type III - Snatch blocks, safety locking.
    Type IV  - Safety blocks.

    Style 1  - Single sheave (applicable to types II, III, V).
    Style 2  - Double sheave (applicable to types I, II, IV, V).
    Style 3  - Triple sheave (applicable to types I, II).

Beneficial comments, recommendations, additions, deletions, clarifications, and any data which may improve this document should be sent to: USA Belvoir Research, Development and Engineering Center, ATTN: STRBE-TSE, Fort Belvoir, VA 22060-5606.