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Ronstan RF15101 Series 15 Ball Bearing Block Single Loop Top

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

RF15101
06/14/2036 7:53 PM
Sale Price

$10.74

In Stock (7)

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Usually delivered within 2 days

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No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Ronstan Series 15 Ball Bearing Single Block is an ultra-compact, lightweight block featuring a 5/8" diameter sheave with exceptional strength-to-weight ratio. This micro block delivers ball bearing performance in the smallest package available, making it ideal for dinghies, small sailboats, and creative rigging applications.

Key Features:

  • Precision-molded UV-stabilized acetal sheave running on stainless steel ball bearings for smooth, low-friction operation
  • 316 grade stainless steel cheeks, headpost, shackle, and ball bearings for maximum corrosion resistance in marine environments
  • Single loop head design with O-ring separator to prevent interference between running line and attachment hardware
  • Smallest and lightest ball bearing block on the market at just 0.3 oz (7 g)
  • Versatile applications including cunninghams, vangs, tweakers, shock cord retractors, and purchase systems
  • Ideal for youth sailing classes (Optimist, El Toro, Sabot) and high-performance dinghies

Specifications:

  • Sheave Diameter: 5/8" (15 mm)
  • Maximum Line Diameter: 3/16" (5 mm)
  • Maximum Working Load: 260 lbs (120 kg)
  • Breaking Load: 1,210 lbs (550 kg)
  • Weight: 0.3 oz (7 g)

Perfect for sailors looking to reduce weight and add efficient mechanical advantage in space-constrained applications. The combination of ball bearing technology and micro dimensions makes this block suitable for both marine and land-based rigging projects.

Products specifications

Type

Single

Diameter

3/16 Inch or 5 mm

Ball Bearings

Stainless Steel

Becket

No Becket

Direction

Any

Integral Cleat

No Integral Cleat

Great so far

Great price and shipping is more than reasonable.

found part after lots looking glad to find it.

thanks for having such great prices

Fast shipping, very helpful staff, product was in stock at Autoplicity and I couldn't even find it at any other supplier. Thanks Autoplicity!

Thanks

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