My Account
Shopping Cart

Ronstan RF55110 Series 55 Orbit Ball Bearing Single Block with Becket and Swivel Mount

Manufacturer

Ronstan

<h3>About Ronstan – A Legacy Built on the Water</h3><p>Few names in the sailing world carry as much weight as Ronstan. <strong>Founded in 1953</strong> by Ron Allat and Stan Lenepveu, the company began as a small boatbuilding operation in Highett, a suburb of Melbourne, Australia. What started as handcrafting custom yacht fittings for fellow sailors at the nearby Black Rock Yacht Club steadily grew into one of the most respected sailboat hardware manufacturers on the planet. The brand name itself is a nod to its founders — Ron and Stan — whose passion for sailing and precision craftsmanship shaped the company's DNA from day one.</p><p>Today, <strong>Ronstan International</strong> is a globally recognised manufacturer and supplier of sailboat hardware, rigging components, winches, sailing gear, and accessories, with its head office remaining in Braeside, Victoria, Australia. The company has established manufacturing facilities in Australia, Denmark, and Indonesia, along with sales offices in the United States, and distributes products to sailors in over 40 countries around the world. In November 2023, Ronstan joined <strong>Groupe Wichard</strong>, aligning with an industry leader whose portfolio spans more than ten world-renowned brands in the sailing and safety markets — a move that further strengthens Ronstan's global reach and product offering.</p><h3>Engineered for Every Sailor, Proven at the Highest Levels</h3><p>Ronstan's reputation spans the full spectrum of sailing — from first-time dinghy sailors to elite competitors at the America's Cup and Olympic Games. The brand serves as the official supplier to the Australian Sailing Team, and Ronstan hardware has appeared aboard medal-winning boats across multiple Olympic campaigns. That pedigree at the pinnacle of racing directly fuels the innovation available to everyday sailors: the demanding performance requirements of top-tier competition have driven many of the technical breakthroughs found throughout Ronstan's broader product range.</p><p>The company's catalog encompasses well over 2,000 products, including pulley blocks, traveller systems, furlers, rope cleats, stainless steel fittings, shackles, snap shackles, and winches. Whether you're outfitting a small racing dinghy, a family cruiser, or an offshore race yacht, Ronstan offers hardware designed and tested to perform in real-world conditions. Their in-house capabilities span design, engineering, precision injection moulding, CNC machining, metal pressing, and assembly — all of which contribute to the consistent quality sailors have come to expect from the brand.</p><h3>Top Ronstan Product Categories</h3><p>Among Ronstan's most popular product lines are their <a href="/11561-ronstan-tiller-extensions-accessories-202641">Tiller Extensions &amp; Accessories</a>, which encompass both their renowned carbon fibre and alloy tiller extension ranges. Whether you need a lightweight, rigid fixed-length stick or a telescopic option for adjustable reach, Ronstan's tiller extensions are engineered for decisive helm response and positive grip in all conditions. Complementing these are Ronstan's <a href="/11561-ronstan-tiller-extensions-accessories-201068">Tiller Extension Accessories</a> — including universal joints, retaining clips, and end knobs — that allow sailors to fine-tune their setup or replace worn components with ease.</p><p>Ronstan also produces a well-regarded line of <a href="/11561-ronstan-fairleads-201944">Fairleads</a>, designed to guide lines smoothly across a boat's deck. Available in UV-stabilised nylon and with optional stainless steel liners for added strength and longevity, these practical fittings are a staple of both dinghy and keelboat rigging setups worldwide.</p><h3>Why Choose Ronstan?</h3><ul><li><strong>70+ years of marine hardware expertise</strong> rooted in Australian sailing culture</li><li>Products trusted by Olympic sailors, offshore racers, and cruising sailors alike</li><li>Over 2,000 products covering everything from small dinghy fittings to superyacht systems</li><li>Advanced manufacturing across three international production facilities</li><li>Part of Groupe Wichard, adding complementary product depth and global support</li></ul>

Part Number

RF55110
06/21/2036 2:21 AM
Sale Price

$36.73

In Stock (7)

delivery box

Usually delivered within 2 days

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Ronstan RF55110 Series 55 Orbit Block features an innovative orbital ball bearing design that delivers exceptional performance for sailing applications on boats up to 30 feet. This single block with integrated becket and swivel head mount combines ultra-lightweight construction with a maximum working load of 1,100 lbs, making it the lightest block in its class while maintaining superior strength.

Key Features:

  • Ultra-lightweight design at just 3.1 oz with 1,100 lb working load capacity
  • Two-stage orbital ball bearing system minimizes friction across full load range
  • Through-sheave becket arrangement for lowest possible weight
  • Swivel shackle head in 316 stainless steel allows unlimited block rotation
  • 55mm diameter sheave accommodates rope up to 10mm (3/8 inch)
  • Fiber-reinforced, stress-optimized load frame
  • Dyneema SK75 fiber link provides exceptional strength-to-weight ratio
  • Low profile and compact design for easy installation

Construction:

  • Sheave and bearings: Carbon fiber reinforced, PTFE-impregnated nylon with high-compression acetal ball bearings
  • Frame and cheeks: Toughened, glass fiber reinforced nylon
  • Head fitting: Marine-grade 316 stainless steel
  • Rope link: UV-stabilized multi-strand SK75 Dyneema

Ideal Applications:

  • Mainsheet and spinnaker sheet systems on dinghies, sportsboats, and small keelboats to 30 feet
  • Halyard, vang, and backstay applications on boats to 26 feet
  • Control line systems on larger yachts

Specifications:

  • Maximum Working Load: 1,100 lbs (500 kg)
  • Breaking Load: 2,200 lbs (1,000 kg)
  • Sheave Diameter: 55mm (2-5/32 inches)
  • Maximum Rope Diameter: 10mm (3/8 inch)
  • Weight: 3.1 oz (88g)

The RF55110's orbital bearing design positions the bearing only in active areas of the floating sheave, eliminating unnecessary mass from the inactive return race and hub. This engineering innovation delivers 30% weight savings compared to competitors while maintaining the highest working load in its class.

Products specifications

Type

Single

Diameter

3/8 Inch or 10 mm

Mount Type

Swivel Shackle

Weight

0.19

Becket

No Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

1100 Pounds

Sheave Diameter

2 5/32 Inches or 55 mm

Great site for hard to find auto part at great price

Good Pricing.

Thanks

quick and easy

easy order

Exceeded my expectations searching and ordering

Really good knowing the parts are exact to my jeep

Seemed fine.

Rather amazing and uneventful service in this day and age. Ordered a Thule bike rack for my Nissan Murano. It was in stock (unusual for high-end specialty products), shipped the next day, and was on my doorstep in a few days (excellent for a 60 lb. large box). I'd buy anything from these people without any reservation. AND, your order is insured - completely superfluous. Oh, and did I mention, the lowest price I could find ANYWHERE, and not by a few dollars - a lot.

Thanks

Great service and super quick shipping. Will use them again

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy