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Trim for speed
Ronstan’s ball bearing and high load blocks, conceived and engineered for the demands
of competitive sailing in skiff, Olympic and spor ts boat classes, have rapidly become the
international choice for high performance hardware.
• Used on boats of all sizes for sheet, fine tune and control line applications.
• Highly efficient, low friction bearing systems for optimum sheeting and trimming
performance.
• The comprehensive range of sizes and configurations offers solutions for
powerful multiple purchase and cascade systems.
• Practical Smar t Features™ designed into the blocks provide extra
versatility.
Ball Bearing Blocks
Ball Bearing Blocks meet the high performance demands of running sheet applications with a unique
two-stage bearing system.
Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.
Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in
increased friction, a sliding Acetal bearing on a polished Stainless steel race takes over,
maintaining low friction performance.
Regular flushing with fresh water to remove salt and sand will maintain optimum performance
over a long service life. These blocks are an excellent choice for main and jib sheets,
spinnaker sheets and control lines.
High Load Blocks
The ideal block for high load applications. Wear resistant sheave materials, either in
lightweight, self lubricating polymer or in alloy with special purpose bushes, are
suitable for use with rope or wire. High Load Blocks provide outstanding static load
performance and are typically used for halyards, backstays, etc.
0°/ 90° Loop Head
Some loop top blocks can be fitted with a shackle in either of two planes to allow
correct alignment of the block.
Captive Lock™ Universal Head
A simple sliding lock that can be engaged to lock the head post in either of
two planes, or disengaged to allow the block to swivel.
0°/ 90° 2-Axis Shackle Head
Some double and triple blocks can be locked at 0° or 90° by removing the
shackle and changing the head post orientation.
Bearing Cut-Outs
Cut-outs in the cheeks make it easy to flush salt and sand out of the
bearings to ensure a long service life for the product.
Adjustable Cleat Arms
The angle of the cleat arms can be adjusted easily. Sliding posts are
simply pulled out of the stops to adjust (no tools required), and then snap
back into locked position to secure the arms.
Keyhole Becket Pins
Becket pins lock into keyhole slots. No tools are required to remove the pins to
fit pre-spliced lines or lock them back into place.
BALL BEARING & HIGH LOAD BLOCKS
