Ronstan's new Series 20 Blocks are the smallest of Ronstan's ball bearing blocks. They have very high maximum working loads between 440 and 880 lbs., depending on the block configuration.
Sheaves are 20mm (3/4 in) and support a max line size of 6mm (1/4 in).ﾠ High-load (HL) blocks can handle wire up to 1/8 in in diameter.
These blocks are suitable for almost all small dinghy control line systems and work well in lightly loaded control lines assemblies on larger boats as well.ﾠ Can be used for outhauls, vangs, barber haulers, cunninghams, traveler controls, leach cords, lead car return tackles, and even flag halyards.
This is a triple block that allows for the creation of a powerful purchase system. Incorporated in it is a shackle and a two-way head that can be fixed in line and perpendicular to the sheave.
|Breaking Load (lbs)||1870|
|Breaking Load (kg)||850|
|Clevis Pin (in)||5/32|
|Safe Working Load (lbs)||880|
|Safe Working Load (kg)||400|
|Sheave Diameter (in)||3/4|
|Sheave Diameter (mm)||20|