MIT snatch block hand pulling block has single, double and treble configurations. When reeving a pair of SuperLift sheave blocks one of which has more than two sheaves the lead line should come off one of the centre sheaves of the upper block to prevent toppling of the upper block and possible damage to the rope. Always start reeving from the becket and avoid chafing the rope on the side plates, when you have completed reeving, the bottom block must be at right angles to the top block as in fig.1. The upper block has a greater hook load due to the pull on the lead rope. The sheaves in these blocks revolve at different speeds, those nearest the lead line rotate at the highest speed therefore wear out faster. For applications which require heavy lifting or high speed operation, bronze bushes or roller bearings should be specified when ordering.
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