Ronstan Series 40 Ball Bearing Orbit Block - Cheek [RF45151]
![Ronstan Series 40 Ball Bearing Orbit Block - Cheek [RF45151]](http://finandanchor.com/cdn/shop/files/70626XL.jpg?v=1704377605&width=1000)
⚓ The Secret to a Better Buy!
Picture this—you spot what looks like a killer deal on the horizon... But as you sail closer, hidden reefs appear: high shipping fees, slow processing times, and questionable products that don’t hold water. Before you know it, you’re caught in a rip current of regret.
That’s not how we do things at Fin & Anchor.
Here, you’re the captain, and we make sure your course is smooth sailing from checkout to delivery. No hidden fees. No knockoff gear. No waiting weeks for your order to arrive. Just top-quality products, backed by real warranties, with fast and free shipping.
🌊 Why Smart Boaters & Adventurers Choose Us:
✅ Authentic, Manufacturer-Backed Products – No shady third-party refurbs—just genuine gear backed by real manufacturer warranties. Buy with confidence.
✅ Based in Long Beach, California – Fast shipping from U.S. warehouses (not some mystery ship halfway across the world).
✅ Exclusive Free 2-Day Shipping – Orders $499+ qualify for fast, free 2-day delivery on most products. No gimmicks, just speed.
✅ Same-Day Shipping – Order by 12 PM PST, and we’ll get it out the door today so you can hit the water faster.
✅ Fast & Free U.S. Shipping – No hidden fees, no last-minute charges—what you see is what you pay.
✅ More Ways to Pay – Use Shop Pay Installments to split your purchase into easy payments, or checkout with Amazon Pay, Google Pay, and all major credit cards for a seamless shopping experience.
✅ Earn Rewards on Every Purchase – 1 Fin Buck for every $1 spent! Rack up points and redeem them for discounts on future orders—it’s our way of saying thanks.
✅ Dedicated Support from Real People Who Care – 💬 Chat with us! We may not be salty sea captains, but we’re passionate about helping you find the right gear. If we don’t have the answer, we’ll chase it down for you—no call centers, no canned responses, just real help when you need it.
👉 Bottom line? You deserve better than surprise fees, slow shipping, and questionable sellers. With Fin & Anchor, you get smooth sailing, start to finish.
Now that’s a smart buy. ⚓
🚚 Shipping & Returns
Shipping: Free U.S. standard shipping on all orders. Order before 12 PM PST, Monday–Friday for same-day shipping (excluding holidays). Expedited shipping options are available at checkout. View our full Shipping Policy.
Returns: 30-day easy returns. Refunds processed within 5-7 business days. View our full Return Policy.
Ronstan Series 40 Ball Bearing Orbit Block - Cheek [RF45151]
Product Details & Specifications
Series 40 Ball Bearing Orbit Block - Cheek
Features:
- Ultra Lightweight
- Low friction 2-stage Orbital ball bearing system
- Highest working load in its class
- Low profile and compact
- High performance cleating
- Base suits curved mounting surface
- Low mounting points for maximum strength
Lightweight
Kilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world’s lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimizes the mass of the inactive return race and hub.
Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.
Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.
Highest Working Load In It's Class
The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximizes load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.
The floating sheave and bearing system is supported by a fiber-reinforced load frame. The design was computer modeled to be stress optimized.
Recommended fasteners - 3 x 4mm (5/32") countersunk head screws
Applications:
- Mainsheet systems on spinnaker sheet on dinghies to 5m (16ft)
- Spinnaker sheets on dinghies, sportsboats and small keel boats to 5m (16ft)
- Halyard, vang and backstay applications on boats to 8m (26ft)
- Control line applications on larger yachts
Materials:
- Ball Bearings - High compression strength carbon black Acetal.
- Stage 2 Bearing - Glass fibre reinforced, MoS2 impregnated Nylon
- Frame/Cheeks - Toughened, glass fibre reinforced Nylon
- Sheave - Carbon fiber reinforced, PTFE impregnated Nylon