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Ronstan RF20151A Series 20 Ball Bearing Block Single Cheek Rivet Mount 20mm

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

RF20151A
06/21/2036 3:48 AM
Sale Price

$16.95

In Stock (9)

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Product Details

The Ronstan RF20151A is a high-performance Series 20 ball bearing block featuring a single cheek design with rivet mounting capability. This precision-engineered block is designed for small boat control line applications where low friction and reliable performance are essential.

Key Features:

  • Precision molded Acetal sheaves running on stainless steel ball bearings for exceptionally low friction operation
  • High static and dynamic load capacity with 200kg (440 lbs) maximum working load and 550kg (1,210 lbs) breaking load
  • Lightweight construction at just 17g (0.6 oz) minimizes weight aloft
  • Versatile mounting options suitable for screw or pop rivet installation
  • UV-stabilized materials for long-lasting durability in marine environments

Ideal Applications:

  • Dinghy control lines and running rigging
  • Vang systems
  • Cunningham controls
  • Traveller control systems

Construction & Materials:

  • UV-stabilized Acetal sheaves resist sun damage and provide smooth operation
  • Stainless steel ball bearings for minimal friction and maximum longevity
  • Grade 316 stainless steel load strap and head fitting for superior corrosion resistance
  • Impact and UV-resistant, fiber-reinforced Nylon cheeks ensure durability

Specifications:

  • Sheave Diameter: 20mm (3/4")
  • Maximum Rope Diameter: 6mm (1/4")
  • Maximum Working Load: 200kg (440 lbs)
  • Breaking Load: 550kg (1,210 lbs)
  • Weight: 17g (0.6 oz)

This single cheek block provides the perfect balance of strength, light weight, and smooth operation for demanding sailing applications.

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