Reduce weight and bulk with Ronstan's Series 55 Ball Bearing Orbit Blocks. These ultra-lightweight blocks are almost entirely of high-tech, composite, polymer materials.
Ronstan's two-stage bearing system features high-compression grade Acetal ball bearings and a secondary full-contact Nylatron sheave and full contact bearing for dynamic loads, which results in minimum friction.
Use these blocks in mainsheet and spinnaker sheet applications on dinghies, sportboats, and small keelboats. They are also ideal for halyard, vang, and backstay applications on boats up to 26' (8m) and control line applications on larger yachts. Make sure you have a standard Dee shackle with a slotted pin of 5/32 in diameter for attachment.
This single swivel block has a stainless steel head for ultimate durability, compatibility with harsh fixing points, and unlimited block rotation.
|Breaking Load (lbs)||3300|
|Breaking Load (kg)||1500|
|Max Line Size (in)||3/8|
|Max Line Size (mm)||10|
|Note||SWL = Total block load. Load on becket not to exceed 33% of block load. MWL - 250g (550lbs) & Breaking Load - 500kg (1,100lbs).|
|Safe Working Load (lbs)||1650|
|Safe Working Load (kg)||750|
|Sheave Diameter (in)||2 5/32|
|Sheave Diameter (mm)||55|