RONSTAN Series 40 Ball Bearing Utility Blocks RF45130

Single, Becket, Cleat, Swivel Head*


  • Ultra Lightweight
  • Low friction 2-stage Orbital ball bearing system
  • Highest working load in its class
  • Low profile and compact
  • High performance cleating

74.73  VAT not included

Breaking load
Rodamientos de bolas
RF45101 PXA Polea simple, 40 8 325 700 33
RF45110 PXC Polea simple, grillete giratorio, arraigo 40 8 325*1 650 44
RF45111 PXB Polea simple, arraigo 40 8 325*1 700 36
RF45130 PXG Polea simple Orbit 40 con grillete giratorio, arraigo y mordaza* 40 8 325 700 105
RF45131 Polea simple, mordaza ajustable, arraigo 40 8 325*1 700 98
RF45140 Polea simple Orbit 40 con arraigo, con puente y base 40 8 325 700 54
RF45201 PXE Polea doble 40 8 500 1000 67
RF45211 PXF Polea doble, arraigo 40 8 500*2 1000 72
RF45301 Polea triple 40 8 650 1350 98
RF45311 PXH Polea triple, arraigo 40 8 650*3 1350 105
RF45151 PXD Polea plana de re-envío 40 8 325 700 32
RF45501 PXI Polea violín* 40 + 22 8 325 700 47
RF45511 PXJ Polea violín,*, arraigo 40 + 22 8 325 700 48
RF45521 PXK Polea violín*, mordaza ajustable 40 + 22 8 325 700 108
RF45531 PXL Polea violín*, arraigo, mordaza ajustable 40 + 22 8 325 700 109

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Becket pin is removeable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools.


Kilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world’s lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub.

Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.

Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.


Highest working load in its class

The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.

The floating sheave and bearing system is supported by a fibre-reinforced load frame. The design was computer modelled to be stress optimised.   


  • Mainsheet systems and spinnaker sheets on dinghies to 5m (16ft)
  • Spinnaker sheets on dinghies, sportsboats and small keel boats to 5m (16ft)
  • Halyard, vang and backstay applications on boats to 8m (26ft)
  • Control line applications on larger yachts
Weight 1 kg
Dimensions 15 × 6 × 8 cm

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