Wear on pins or axles, rope grooves, side plates, bushing or bearings, and fittings. The frequency of inspection and lubrication is dependent upon frequency and periods of use, environmental conditions, and the user’s good judgment.Īs a minimum, the following points should be considered:ġ. Their proper use and maintenance is equal in importance to other mechanical equipment. How will the snatch block or tailboard be maintained? Do conditions in your application require special maintenance considerations?īlocks and tailboards must be regularly inspected, lubricated, and maintained for peak efficiency and extended usefulness. What is the fleet angle of the wire rope? Line entrance and exit angles should be no more than 1 1/2°.ġ0. If the block is to be a traveling block, what weight is required to overhaul the line?ĩ. How will the block or tailboard be reeved and does it require a dead end becket?Ĩ. You should also decide whether the fitting should be fixed, swivel or swivel with lock.ħ. Your choices include single or multiple hooks with or without throat latches and shackles, which are the most secured load attachment. What type of fitting is required for your application? The selection may depend on whether the block will be traveling or stationary. There are several choices of bearings suitable for different applications.Ħ. What is the speed of the line? This will help you determine the type of sheave bearing necessary. You should also consider fatigue factors that affect wire rope or synthetic rope life.ĥ. What is the size of line to be used? Multiply the available line pull by the desired safety factor for wire rope or synthetic rope to determine the minimum catalog wire rope or synthetic rope breaking strength consult a wire rope or synthetic rope catalog for the corresponding grade and diameter of wire rope or synthetic rope to match. As an alternative, you could calculate the line pull required with a given number of parts of line and a given load weight.Ĥ. How many parts of line are required? This can be determined given the load to be lifted and the line pull you have available. What is the weight of the load, including any dynamics of impacts that add to load value? You must know this to determine the minimum required Working Load Limit value of the block or tailboard.ģ. Are there regulations which could affect your choice of blocks or tailboards, such as federal or state OSHA, elevator safety, mine safety, maritime, insurance, etc.?Ģ. To select a snatch block or tailboard to fit your requirements, consider the following points:ġ. Type of Block ( Snatch Block with Hook, Snatch Block with Shackle, or Tailboard) Type of Bearing: (BB) Bronze Bushed, (RB) Roller, (TB) Tapered RollerĦ. The following information should be specified:ĥ. Horizon can also customize any snatch block or tailboard for your specific application to handle any working load limit per customer request. We also have the alloy options for snatch blocks and tailboards with a 40% weight reduction versus conventional blocks. Horizon Cable's selection of blocks and tailboards all come standard with an easy open feature which makes it easy to reeve the block without removing any fitting from the end of the wire rope or synthetic rope of choice. These offerings are available with a wide array of sheave sizes and can accommodate wire rope or synthetic rope from 5/16” - 1 ¼”. Horizon Cable Service provides snatch blocks with hooks, snatch blocks with shackles, and tailboards with capacities up to 60 tons from McKissick as well as many other top manufacturers. Snatch blocks are not designed for longs lifts and continuous service as construction and crane blocks are. A snatch block, by definition, is a block that can be opened on one side to insert a rope, thereby avoiding the necessity of threading the rope through from one end. One of the most widely used blocks on the market today are snatch blocks.
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