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Block Information 2017-12-14T10:42:08+00:00

Block Information

Block Size and load information

The size of block that you choose to use on your boat is a vital step in the process of buying your new Garhauer block. The working load of your block depends on the angle of the sheet on the block and the load on the line. To help you decide what series of block you need in each particular case we have provided the table below to help you calculate what you need.
Angle of Sheet (degrees) Percentage of Line load on the Block Angle of Sheet (degrees) Percentage of Line load on the Block
10 17 105 159
20 35 120 173
30 52 135 184
45 76 160 197
60 100 170 199
75 122 180 200
90 141

This means that when the angle of the line on the block is at 60 degrees, the maximum load on the block has been reached so the line load can be at most the full Safe Working Load. For example, if the block has a SWL of 900kg, if the line through the block is to be at 60 degrees, then the line load can be at most 900kg. Similarly if the angle of the sheet on the block is 180 degrees, then the max load on the line would be half the SWL. In the case of our 900kg SWL block, the max load on the line would be 450kg.

Once you know the max load that you need your block to manage, please use the table below to help identify the range of block to investigate.  Please note there are high load blocks available in the single block range to increase the SWL.  These high load blocks are for the 40-70 series single blocks.

Series 15 20 25 27 30 40 50 60 70
Max Line Size
5/16″
8mm
5/16″
8mm
3/8″
10mm
3/8″
10mm
1/2″
12mm
1/2″
12mm
5/8″
16mm
5/8″
16mm
3/4″
19mm
Sheave Diameter
1″
25mm
1-3/4″
44mm
2″
50mm
2-1/4″
57mm
2-1/2″
63mm
2-1/2″
63mm
3″
76mm
3-1/4″
82mm
4-1/4″
108mm
Safe Working Load
400lb
182kg
600lb
272kg
1150lb
520kg
2000lb
907kg
2400lb
1088kg
2800lb
1270kg
3000lb
1360kg
3500lb
1590kg
5000lb
2267kg