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 Size | Maximum Line Ø | Sheave Ø Single/Double | Sheave Ø Fiddle Lower | Sheave Ø | Sheave Width | SWL | MBL | MLR |
Size 1 |
8mm |
30mm |
na |
na |
12mm |
355kg |
710kg |
245kg |
Size 2 |
8mm |
35mm |
30mm |
45mm |
12mm |
370kg |
740kg |
260kg |
Size 3 |
10mm |
45mm |
30mm |
58mm |
13mm |
400kg |
800kg |
270kg |
Size 4/5 |
12mm |
54mm |
38mm |
64mm |
17mm |
750kg |
1500kg |
525kg |
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.