Ronstan Series 30 Ball Bearing Orbit Blocks, Cheek/Double

RF35151: Series 30 Ball Bearing Orbit Cheek Block
Ball bearing single sheave Orbit Block™. Requires 2 x 4mm (5/32") fasteners.

SPECIFICATIONS

• Sheave diameter (mm) 30
• B.L. (kg) 600
• M.W.L. (kg) 300
• Max. Rope diameter (mm) 8
• Weight (g) 21
• Fastener Ø (mm) 4
• Qty. Fasteners 2

RF35202: Series 30 Ball Bearing Orbit™ Block, Double

SPECIFICATIONS

• Sheave diameter (mm) 30
• B.L. (kg) 900
• M.W.L. (kg) 450
• Max. Rope diameter (mm) 8
• Weight (g) 56
• A (mm)46.0

RF35212: Series 30 Ball Bearing Orbit™ Block, Double with Becket

SPECIFICATIONS

• Sheave diameter (mm) 30
• B.L. (kg) 900
• M.W.L. (kg) 450
• Max. Rope diameter (mm) 8
• Weight (g) 57
• Notes: Becket suits up to 6mm (1/4”) line. For lines above 6mm (1/4”) use an additional Dyneema® link (sold separately). Total block load. Load on becket not to exceed 25% of block load. Suitable for 4:1 system at rated block load.

FEATURES 

• Base suits curved mounting base.

• Lightweight.
• Highest working load in its class.
• Ultra low profile thru-sheave becket.
• Low friction 2-stage ball bearing system provides consistent performance over the full working load range.
• SP versions feature a Nylatron® sheave suitable for both rope and wire

PRODUCT INFORMATION

Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available. This is achieved through all-composite reinforced polymer materials and multiple attachment options. Their precision design provides the optimum number of ball bearings for minimum friction while weight reduction is achieved through the use of fibre-reinforced composites in the block head, cleat arms and beckets.

• Lightweight

Kilogram for kilogram of working load BB Orbit Blocks™ are the world’s lightest. To gain peak performance, we engineered out the heavy steel load straps, head post, shackle and cleating accessories. Through extensive research and development, we replaced virtually all metal components with high-tech polymers and fibre equivalents. Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible. Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. Other brands just link together their single blocks with a heavy steel channel across the top of the block, with unnecessary extra cheeks adding extra weight and bulk not found in Ronstan Orbit Blocks™.

• Highest working load in its class

The proven Ronstan 2-stage bearing system (Series 30 and larger) features high compression grade Acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range. The sheave and bearing system is supported by a fibre-reinforced load frame, computer modelled and optimised using advanced stress analysis methods.

APPLICATIONS

• Mainsheet systems and spinnaker sheets on dinghies to 5m (16ft).
• Halyard, vang and backstay applications on boats to 5m (16ft).
• Control line applications on larger yachts.
• Primary lead blocks on dinghies and catamarans.

MATERIALS

• Sheave: High compression strength carbon black Acetal
• Ball Bearings: High compression strength Acetal
• Frame/Cheeks: Toughened, glass fibre reinforced Nylon
• Link: UV stabilised, multi-strand impregnated SK75 Dyneema®