Ronstan RF46101 Series 40 Single Auto 40mm Ratchet Orbit Block Pulley with Dyneema Link Head

£66.91 £59.99 Excl. Tax: £49.99
2 in stock 2 in stock In stock and ready to ship. See our Shipping and Stock page for more info.

When in stock, UK approx 2-5 workdays, other countries see shipping page

Model Status: Current model

Single high-end auto 40mm ​​​Ronstan Series 40 Ratchet Orbit Block RF46101 ​​ball bearing ratchet pulley with automatic locking / unlocking mechanism and Dyneema® ​Link Head for easy connection.​​​

Sold individually. The price is for one pulley. Order two if you want a pair.

Technical data

Item Metric Imperial
Sheave Ø 40 mm 1 9/16 in.
Max. Rope Ø 9 mm 5/16 in.
M.W.L. 175 kg 385 lb.
B. L. 500 kg 1100 lb.
Weight 35 g 1.2 oz.

Sheave Ø: Wheel diameter
Max. Rope Ø: Maximum rope/line diameter.
M.W.L.: Maximum Working Load.
B. L.: Breaking Limit.

Colours and design may vary from those shown.

Use, Compatibility and fitting

Ronstan Orbit Block Auto Ratchet Pulley 40mm RF46101
Mostly used on more performance-oriented harnesses, especially high-end XC and competition harnesses. Compatible with any paragliding harness with sufficient space to accommodate it. Fitting may need to be done by a professional paraglider harness service centre.

Ronstan Orbit Block Auto Ratchet Pulley 40mm RF46101

Top-of-the-range 40mm diameter Ronstan Orbit Block RF46101 ratchet pulley with ball bearings and automatic locking / unlocking mechanism when tensioned / untensioned. Dyneema® Link head system for easy connection. With this automatic ratchet pulley, the ratchet mechanism engages when load is applied to it, reducing the effort required to hold it, then disengages when the load is released, allowing the line to run back out smoothly and freely.

When the paraglider speed system is applied, the ratchet mechanism engages, automatically locking the pulley wheel in place. This decreases the effort required for the pilot to hold the speed system in place with their legs, causing less fatigue, allowing the pilot to hold the speed system on longer. When the paraglider speed system is released, the ratchet mechanism disengages, automatically unlocking the pulley wheel. This lets the paragliding speed system line run out smoothly and freely - great for rapid easing of the paraglider speed system.

NB: Ratchet pulleys are also known as "winch pulleys".


  • Up to 14:1 holding power - highest available!
  • Smooth easing of sheets
  • Fully automatic load sensing ratchet engagement
  • Easily fitted and securely retained Dyneema® link head

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 competitor.

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.


  • Sheave: 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®


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


User Instructions

For comprehensive details including user instructions, and for spare part tables, and fastener sizes view in various languages using the following links:

RF46101 Series 40 RTA OrbitBlock,Auto, Single, Link Head

Series 40 RTA OrbitBlock,Auto, Single, Link Head

More Information
Condition New
Shipping Details When in stock, UK approx 2-5 workdays, other countries see shipping page
Model Status Current model