By MAURIPRO Sailing Specialists · Updated July 2026
Why Choose Ronstan Blocks?
- Superior load capacity: engineered for high-load-bearing use in demanding conditions.
- Low-friction performance: precision ball bearings and quality sheaves reduce friction for smoother operation.
- Corrosion resistance: stainless steel and reinforced polymer withstand harsh marine environments.
- Lightweight and compact: maximum efficiency without adding weight aloft or on deck.
- Versatile: options for dinghies, keelboats and offshore yachts alike.
Types of Ronstan Blocks
Ball Bearing Blocks
For high-speed, frequently adjusted applications, ball bearing blocks minimize friction and run smoothly under light to moderate loads—ideal for mainsheet and control-line systems.
Plain Bearing (Sheave) Blocks
Built for heavy, static loads, plain-bearing blocks trade a little friction for high strength and durability—the right choice for high-load turning points and halyard leads.
Ratchet Blocks
Ratchet blocks hold load in one direction so you can grip a loaded sheet with far less hand effort—popular for mainsheets and jib sheets on dinghies and small keelboats.
Snatch Blocks
Snatch blocks open on the side so you can drop a line in mid-run without threading the end—handy for spinnaker work, temporary leads and towing.
How to Choose the Right Ronstan Block
Match the block to four variables:
- Load rating: choose a block whose working load exceeds your peak line load, with margin for shock loads.
- Line diameter: the sheave must suit your line size—too large wastes space, too small binds and wears the line.
- Mounting: decide between fixed, swivel, or snap-shackle attachment for your lead.
- Usage type: racing, cruising or offshore—match the bearing type (ball vs plain) to how often the block is adjusted under load.
For Ronstan’s flagship high-performance range, see our deep dive on Ronstan Orbit block technology.
Where to Buy Ronstan Blocks
MAURIPRO carries a wide range of Ronstan blocks—from Series 20 dinghy blocks to high-load Orbit blocks for offshore yachts. If you are comparing brands, our Harken blocks guide covers the same selection logic so you can match the right block to each job on your boat.
Frequently Asked Questions
How do I choose the right size Ronstan block?
Start with the load the block will carry and the diameter of the line running through it. Choose a block whose working load exceeds your peak line load with margin for shock loads, and whose sheave suits your line size. A sheave that is too small will bind and wear the line; too large wastes space and weight.
What is the difference between ball bearing and plain bearing Ronstan blocks?
Ball bearing blocks use rolling bearings for the lowest friction and are best where the line is adjusted frequently under load, such as mainsheets. Plain (sheave) bearing blocks handle high static loads with more strength and durability, making them ideal for turning points and halyard leads that are set and left.
What is a ratchet block used for?
A ratchet block holds load in one direction so you can grip a loaded sheet with much less hand effort, while still easing smoothly. They are popular for mainsheets and jib sheets on dinghies and small keelboats where the crew holds the sheet by hand.
When should I use a snatch block?
Use a snatch block when you need to add a line to a lead without threading the end through—it opens on the side. They are useful for spinnaker sheets and guys, temporary leads, and towing, where you want to drop a loaded or bulky line in quickly.
Are Ronstan Orbit blocks worth it over standard blocks?
Ronstan Orbit blocks use a two-stage bearing system and fibre-reinforced sheaves for a high strength-to-weight ratio and low friction across a wide load range. For performance sailing where weight and efficiency matter, they outperform standard blocks; for light-load cruising leads, a standard block is often sufficient.
Questions? We're Here to Help
Have questions? Chat with us! Our MAURIPRO rigging and sailing specialists are available to help you find the right solution for your boat and sailing style.
Explore our selection: Ronstan Series 100 Orbit Block, Single (RF109100) and related sailing gear at MAURIPRO.
