Ronstan Marine Systems DivisionRonstan Marine Systems Division
 
Ratchet Blocks
 

Series 75mm

Range Information | Applications | Materials | Related Items

Smart Features
  •  Unrivalled 18:1 holding power
  •  Dual sided On-Off switch
  •  Low friction ball bearing system
  •  Lightweight
  •  Cheek cut-outs for easy bearing maintenance

 

   
Product No.
Desc.
Sheave ØMax. Rope ØMax. Cable ØPin ØM.W.L.B. L.Weight

Add to
Wishlist

Shopping
Cart

Stock

Price

  mmmmmmmmkgkgg        
 RF72130 RF72130 > Single, becket, cleat 

75

12

-

7.0

420

2000

455


 
 

  QTY
 

IN
STOCK

Price

£ 289.71

 RF72330 RF72330 > Triple, becket, cleat 

75

12

-

7.0

685

2000

790


 
 

  QTY
 

IN
STOCK

Price

£ 426.76

Back to Top
Range Information
The patented extruded hole design, in conjunction with the groove profile of the sheave, provides a more powerful grip than conventional designs - up to 18:1 holding power. Unrivalled low weight is achieved by the use of a Torlon® ratchet pawl, high grade machined alloy sheave and black Acetal hubs and bearings. On-Off switching knob is fitted to both sides of the swivel blocks (one can be removed if desired), and for foot blocks simply turn the sheave upside down before installation to change the sense of rotation. Unique On-Off switch mechanism can be operated under load. Ratchet blocks can be disassembled for servicing or customisation.

    
Back to Top
Applications
  • Mainsheet on powerful dinghies and skiffs Mainsheet systems on sportsboats using RF7 or RF8 mainsheet swivel units
  • Triple ratchet blocks are ideal for off-the-beach and formula catamarans, fiddle versions are used on sportsboat mainsheet systems
  • Vang, furler and other control line applications on larger boats
Back to Top
Materials
  • Carbon black Acetal ball bearings
  • Alloy sheave and cheek plates
  • Torlon® ratchet pawl
  • Grade 316 stainless steel forged shackle
Back to Top