Ronstan Series 30 Ball Bearing Lashing Block

Sup. No.
- +
Add to Wish List

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.


  • Ultra-strong HHL sheave and bearing race: Grade 2205 stainless steel, Balls: Grade 316
  • RF35109HL features class leading dynamic and static load ratings for a 30mm block
  • Frame/cheeks: Glass fibre reinforced nylon
  • Low profile and compact, through sheave becket
  • Suitable for both rope and wire 


  • Sheave: Ø 30 mm
  • Max. Rope: Ø 8 mm
  • Max. Cable Ø mm
  • Pin: Ø mm
  • M.W.L. 550 kg
  • B. L. 1650 kg
  • Weight: 42 g


  • 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
  • Ideal for high load applications such as halyards, cascading vangs, backstays, outhauls and cunningham systems.


Shipping rates are automatically calculated based on live quotes supplied by our shipping partners. The quote takes into consideration, the bulk of your cart, where you want it delivered and if you want express or standard shipping.

Get a shipping rate estimate by adding items to your online cart. Go to the cart by clicking on the shopping cart icon located at the top right of the page. Then enter your shipping destination information into the "Estimate Shipping and Tax" section of the shopping cart summary.

International Shipping
We are currently unable to deliver online orders outside of Australia.

If you are located outside of Australia and wish to place an order offline. Please contact our Special Orders Delivery department or send us an enquiry via the orange help bubble located at the bottom right of this page.



Online purchases can be returned/exchanged within 30 days. Some exclusions do apply.

Visit our Returns Policy page for details on how you can return an item.