Ronstan 30

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Ronstan block 30


BB Orbit Blocks™ are the lightest in the world. Thanks to extensive research and development works, virtually all metal elements have been replaced with technologically advanced polymers and their equivalents.

Weight and size are further reduced in various block configurations. 

Single ball bearing block with butterfly lock, has an intermediate ring connection. 

Result? The lowest weight possible.


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Self-lubricating Nylatron® rollers and full contact bearings for high dynamic loads.

Orbit Blocks™ ball bearings have the highest strength-to-weight ratio available. This is achieved through versatile reinforced polymer materials.

The precision design provides the optimum number of ball bearings for minimal friction, and weight reduction is achieved through the use of fiber reinforced composites.

UV stabilized, multi-strip impregnated with SK75 Dyneema®

Ronstan's proven two-stage bearing system (series 30 and larger) features high compression Acetal ball bearings and a full contact secondary bearing. This gives minimal friction over the entire working load range.

The roller and bearing system is supported by a fiber reinforced load frame, computer modeled and optimized using advanced stress analysis methods. 

Dyneema® Link, used in pulley blocks, is manufactured from high specification SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the pulley to the load point.

Roller Ø 30 mm

max. Ø rope 8 mm

MWL 300 kg

BL 600 kg

Weight 21g

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