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 5996-00-482-1170
NSN 5835-01-143-9143
NSN 5910-01-342-2802
NSN 5990-01-335-7948
NSN 5990-00-236-8152
NSN 5925-01-613-4502
NSN 5985-01-392-4140
NSN 5915-01-480-3433
NSN 5835-01-340-0786
NSN 5975-01-609-8153
NSN 6620-00-506-0112
NSN 5999-01-347-6765