RONSTAN Series 30 Ball Bearing RF35140

Stand up, swivel


  • Lightweight
  • Highest working load in its class
  • Secure, versatile attachment
  • Ultra low profile thru-sheave becket.
  • Low friction 2-stage ball bearing system provides consistent performance over the full working load range.
  • SP versions feature a Nylatron® sheave suitable for both rope and wire

23.02  VAT not included

Breaking load
RF35100 PWB Single & becket, swivel 30 8 300 600 32
RF35101 PWE Single & becket, lashing head 30 8 300 600 22
RF35202 PWJ Double 30 8 450 900 50
RF35212 PWK Double, becket* 30 8 450*2 900 51
RF35302 PWN Triple 30 8 550 1100 73
RF35312 PWO Triple, becket 30 8 550*3 1100 75
RF35322 PWP Triple, cleat* 30 8 550 1100 124
RF35332 PWQ Triple, becket, cleat* 30 8 550*3 1100 126
RF35100D PWD Single & becket, swivel, self-lubricating Nylatron® sheave 30 8 300 600 31
RF35101D PWF Single & becket, lashing head, self-lubricating Nylatron® sheave 30 8 300 600 21
RF35100A PWC Polea simple, grillete giratorio, opcionalmente con arraigo 30 8 300 600 31
RF35140 PWG Polea simple giratoria, con puente y muelle 30 8 300 600 33
RF35141 PWH Polea simple con puente y muelle 30 8 300 600 36
RF35151 PWI Polea de re-envío 30 8 300 600 21
RF35284 PWL Combinación de dos poleas, Serie 30 30 8 300 600 46
RF35286 PWM Dos poleas sinples fijadas en una anilla 30 8 300 600 63


Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available.  This is achieved through all-composite reinforced polymer materials and multiple attachment options.
Their precision design provides the optimum number of ball bearings for minimum friction while weight reduction is achieved through the use of fibre-reinforced composites in the block head, cleat arms and beckets.

Kilogram for kilogram of working load BB Orbit Blocks™ are the world’s lightest. To gain peak performance, we engineered out the heavy steel load straps, head post, shackle and cleating accessories. Through extensive research and development, we replaced virtually all metal components with high-tech polymers and fibre equivalents.
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.  Other brands just link together their single blocks with a heavy steel channel across the top of the block, with unnecessary extra cheeks adding extra weight and bulk not found in Ronstan Orbit Blocks™.

Highest working load in its class
The proven Ronstan 2-stage bearing system (Series 30 and larger) features high compression grade Acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.
The sheave and bearing system is supported by a fibre-reinforced load frame, computer modelled and optimised using advanced stress analysis methods. The Dyneema® Link, used in multi-sheave blocks, is produced from high spec SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.

Simple, versatile and secure attachment
The single block is easily lashed to an attachment point, and can also accept Dyneema® Links and shackles for a variety of efficient attachment alternatives. The Dyneema® Link used in multi-sheave blocks is easily fitted and secured by a removable pin.  The Dyneema® Link can also be removed and replaced by a shackle, custom lashing or strop.
These blocks are far more compatible with Dyneema®/Spectra® lines, carbon laminate connection points and webbing than traditional blocks with steel loop tops or shackles.

Low profile and compact
The two way head in the single lashing block allows for alignment at 0° or 90° orientation, while the single swivel block allows for full articulation.
The flexible Dyneema® Link used in multi-sheave blocks provides 0° or 90° orientation. It connects directly to the head of the block rather than to an intermediate head post. This reduces weight and gives the lowest possible profile while allowing full articulation.
Beckets have been carefully designed to minimise height.

High performance cleating
Ronstan BB Orbit Blocks™ feature strong, lightweight fibre-reinforced cleat arms optimised at the required cleating angle. Race-proven, carbon-fibre reinforced Ronstan C-Cleats give secure rope holding with low entry and exit efforts, and are fitted with fairleads for fast action from any angle.
*RF35100 & RF35100D have stainless steel head posts & shackles.


  • Mainsheet systems and spinnaker sheets on dinghies to 5m (16ft)
  • Halyard, vang and backstay applications on boats to 5m (16ft)
  • Control line applications on larger yachts


  • Sheave: High compression strength carbon black Acetal
  • Ball Bearings: High compression strength Acetal
  • Frame/Cheeks: Toughened, glass fibre reinforced Nylon
  • Link: UV stabilised, multi-strand impregnated SK75 Dyneema®
Weight 1 kg
Dimensions 15 × 6 × 8 cm

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