As differentiated by 0.875 in wirerope size, quadruple block
A mechanical device, consisting of a pulley(s) or sheave(s) encased in a shell or frame which may be provided with a means such as a hook, eye, strap, screw, etc., by which it may be attached to an object. It is used to change direction of a running rope and/or to gain a mechanical advantage.
Classification: Pulley tackle and hoists, other than skip hoists or hoists of a kind used for raising vehicles, not powered by electric motor
NSN 5835-00-689-0278
NSN 5996-01-502-6330
NSN 5985-01-615-7777
NSN 5930-00-934-2843
NSN 5925-01-495-4663
NSN 6620-00-004-5466
NSN 5999-00-111-2399
NSN 6150-01-382-9691
NSN 5960-00-963-1285
NSN 5935-01-431-8678
NSN 2925-01-442-7812
NSN 5990-00-103-0528