Barton Ball Bearing Blocks

Barton Ball Bearing Blocks

Barton Ball Bearing Blocks feature a unique super-low friction ball race system, comprising acetal sheaves and delrin ball bearings running on a large diameter centre boss. 
The Barton ball bearing design fits in more load-bearing balls, and consequently promotes extremely low friction performance, even under high loads.

Barton Ball Bearing Blocks Specifications:

Barton MaximumSheave Ø Sheave Ø Sheave Ø SheaveSWLMBLMLR
Line ØSingle/DoubleFiddle LowerFiddle UpperWidth
Size 18mm30mmnana12mm355kg710kg245kg
Size 28mm35mm30mm45mm12mm370kg740kg260kg
Size 310mm45mm30mm58mm13mm400kg800kg270kg
 Size 4/512mm54mm38mm64mm17mm750kg1500kg525kg

Ø = Diameter
MBL = Manufacturer (Barton) rated break load
SWL = Safe Working Load

MLR = Maximum Rolling Load =
 the maximum free running load that ball bearing blocks will accept before ball bearings distort.

Barton Advisory on Break Loads:
Where break and safe working loads are stated, it is assumed that all sheaves are evenly loaded as in a purchase tackle.
Uneven loading, or loading of one sheave in a double or triple block, will severely affect strength quoted.

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