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Ball Bearing Blocks

Blocks with rolling elements are an engineering development of the plain bearing block.

Ball Bearing Blocks are ideal for running rigging applications where the line needs to run fast through the system and where the line needs constant fine tuning adjustment under load e.g. racing sheets - "release, pump, tension, release, pump, tension"

Ball Bearings in blocks are designed to rotate freely and can be identified by the fantastic whizzing sound they make when they are spun by hand under no load.

Ball Bearings are a set of multiple, relatively small diameter, spherical balls encapsulated in a ball 'race or cage' between the sheave and the rotating axle. The inner and outer ball race holds the balls captive and allows them to roll so freely that they are as close as you can get to frictionless. The hardened, round surfaces of the spherical balls can handle both radial and thrust loads. The minimal contact surface area between the small spherical balls is the reason for their negligible resistance to movement. However, because the load bearing surface is also low, ball bearings are susceptible to distortion when subjected to heavy force.

The picture shows a Harken ball bearing block, a ball bearing and a Selden ball bearing block.

Ball Bearing Blocks

Ball bearing block features:

  • Virtually frictionless sheave rotation for free running lines
  • Outstanding response under dynamic loads
  • Ultimate performance and functionality for racing
  • Suitable for rapid release and continual tuning
  • Excellent durability with Delrin/Torlon ball bearings

Parts of a Yacht Rigging Block, traditional and modern

Block Parts Block Parts - Barton

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Harken 75mm Carbo Fiddle AirBlocks - swivel-becket-cam
Selden Single Strap Ball Bearing
Selden Single Ball Bearing 403-101-01
Selden Single Ball Bearing 404-101-01
Selden High Load Ball Bearing 402-201-04
Selden 45mm Autoratchet Block - 404 401 01R
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Selden Single Ball Bearing 406-601-01
Holt Dynamic Blocks

Holt 30mm Dynamic Blocks

Clearance Holt 30mm Dynamic Blocks

£29.20 -50%

Harken Midrange Block - 1540
Barton Size 1 Single Fixed Ball Bearing Block