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

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Stock

Price

  in.in.inin. lb.lb.oz.        
 RF72130 RF72130 > Single, becket, cleat

3

1/2

-

9/32

930

4410

16.0


 
 

NOT
AVAILABLE
ONLINE

---

Price

$ 402.36

 RF72330 RF72330 > Triple, becket, cleat

3

1/2

-

9/32

1510

4410

27.9


 
 

NOT
AVAILABLE
ONLINE

---

Price

$ 561.18

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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.

    
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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
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Materials
  • Carbon black Acetal ball bearings
  • Alloy sheave and cheek plates
  • Torlon® ratchet pawl
  • Grade 316 stainless steel forged shackle
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