Series 55 Orbit Block™, Ratchet with Fiddle, Becket, and Cam Cleat
Ratchet Fiddle Block with Becket, Cleat, and Swivel Head
FEATURES
Up to 20:1 holding power.
Smooth easing of sheets.
High performance cleating.
Ultra-low profile integrated hollow hub becket.
Specifications
Product Specifications
Pin Ø (in)
3/16
Max. Rope diameter (in)
3/8
M.W.L. (lb)
550
Sheave diameter (in)
2 5/32 + 1 3/8
B.L. (lb)
1650
Weight (oz)
8.3
Notes:
Fiddle sheave has a high load full contact bearing (i.e. not ball bearing). Main sheave has 2-stage, ball bearing. Line load through cleat not to exceed 175kg (385lb).
Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong. * Selected Series 55 models.
Awesome ratchet block holding power
Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated CNC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 20:1, almost double that of our nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.
Compositite C-Cleat™ and adustable cleat arm
Series 55 Ratchet Orbit Blocks™ are fitted with our carbon reinforced C-Cleat™ for secure rope holding with low entry and exit efforts, and fairlead for fast action from any angle. Cleat arms are made from the same toughened, glass fibre reinforced nylon and are adjustable for setting to your preferred cleating angle.
Technical Information
Applications
Dinghy mainsheet systems.
Spinnaker sheets on dinghies – especially modern asymmetric classes.
Spinnaker sheets on sportsboats and small keelboats (lateral lead blocks).
Control line applications on larger yachts.
Materials
Ratchet Sheave: Anodised Aluminium.
Ball Bearings: High compression strength carbon black Acetal.
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Ball Bearing 
