Ronstan 40mm Manual Ratchet Block
Now you can enjoy the flexibility of setting up your fitout exactly to suit yourself. Ronstan is the only company that offers a 40mm ratchet block with both auto and manual engagement models*

Manual modes allow the ratchet mechanism to be switched on or off as required. This is the preferred mainsheet set-up for many top sailors.

Awesome ratchet block holding power
Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. The Series 40 delivers up to 14:1 holding power, almost double that of our nearest competititor.

The unique sheave design has 8 gripping faces which directly resist loaded line movement. Traditional designs have 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.

Simple and secure attachment
The Dyneema® Link is easily fitted and is retained securely by a moulded retainer clip. The flexible link can be left with one end attached to the block when fitting - no more lost shackle pins.

The system is compatible with Dyneema®/Spectra® strops, webbing and carbon connection points - much more so than steel loop tops or shackles.

Smooth easing of sheets
With manual models, the sheave cross - hole geometry eliminates the shuddering ease-out that you can expect from traditional v-groove ratchet blocks.

•Up to 14:1 holding power - highest available!
•Smooth easing of sheets
•Manual ON/OFF ratchet selection
•Easily fitted and securely retained Dyneema® link head

•Dinghy mainsheet systems
•Mainsheet fine tune systems on sportsboats & small keel boats
•Mainsheet systems on sportsboats using RF7 mainsheet swivel cleat unit
•Spinnaker and job sheets on dinghies - especially modern asymmetric classes
•Control line applications on larger yachts

•Sheave: Hard anodised Aluminium
•Ball Bearings: High compression strength carbon black Acetal
•Frame/Cheeks: Toughened, glass fibre reinforced Nylon
•Rope Link: UV stabilised, multi-strand impregnated SK75 Dyneema®

Sheave Ø: 40 mm
Max. Rope Ø: 9 mm
Max Working Load: 175 kg
Breaking Load: 500 kg
Weight: 35 g

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