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Ronstan RF48400 Series 40 Orbit Ball Bearing Quad Block with Swivel Shackle

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

RF48400
06/21/2036 10:38 AM
Sale Price

$146.66

In Stock (6)

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Product Details

The Ronstan RF48400 is a high-performance Series 40 Orbit ball bearing quad block with swivel shackle head, engineered for demanding sailing applications on dinghies, sport boats, and yachts. This four-sheave block delivers class-leading load ratings and efficiency in a compact, lightweight package.

Advanced Ball Bearing System:

The RF48400 features Ronstan's innovative 2-stage bearing system that combines ball bearings to minimize friction during trimming with a secondary full-contact bearing to maintain low friction across the entire working load range. This design ensures smooth, effortless line handling even under high loads.

Lightweight, High-Strength Construction:

Built with toughened glass fiber reinforced nylon cheeks instead of traditional stainless steel straps, this block achieves an optimal strength-to-weight ratio. At just 6.8 oz, it provides exceptional durability without adding unnecessary weight to your rigging system.

Integrated C-Cleat System:

Equipped with Ronstan's carbon-reinforced C-Cleat with stainless steel arms, this block offers secure rope holding with low entry and exit effort. The adjustable cleat arms allow you to set your preferred cleating angle, while integrated fairleads ensure fast action from any approach angle.

Key Features:

  • Maximum Working Load: 1,320 lbs
  • Breaking Load: 2,650 lbs
  • Sheave diameter: 1-9/16 inches
  • Maximum rope diameter: 3/8 inch
  • Pin diameter: 5/32 inch
  • Swivel shackle head for versatile attachment
  • Low profile and compact design
  • Four sheaves for high-ratio purchase systems

Ideal Applications:

  • Mainsheet and spinnaker sheet systems on dinghies, catamarans, and sport boats up to 26 feet
  • Halyard, vang, and backstay applications on boats up to 30 feet
  • Control line systems on larger cruising and racing yachts
  • High-ratio purchase systems up to 12:1

The quad sheave configuration combined with the swivel shackle head makes the RF48400 ideal for building complex purchase systems while maintaining easy installation and low system friction.

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Shipping was really fast It came in two packages and that is when I called customer service to check on the order. They were great.

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