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Ronstan RF30101 Series 30 Ball Bearing Block Single Loop Top

Manufacturer

Ronstan

<h3>Ronstan: Precision Sailing Hardware Built for Every Sailor</h3><p><strong>Ronstan</strong> is one of the most respected names in sailboat hardware — and with good reason. <a href="/11561-ronstan">Ronstan</a> traces its roots back to 1953, when two Australian sailors, Ron Allatt and Stan Lenepveu, founded Ronstan Marine Equipment Pty Ltd in Melbourne, Australia. What started as a passion project supplying handcrafted yacht fittings to their local sailing club gradually grew into a global enterprise recognized for engineering excellence and real-world performance.</p><p>Today, Ronstan is headquartered in Braeside, Victoria, Australia, with international offices in the United States and Denmark, and production facilities across three continents. The brand distributes to more than 40 countries and handles upwards of 4.9 million units out of its Melbourne facility every year. In November 2023, Ronstan joined Groupe Wichard, further cementing its place among the world&apos;s most influential marine hardware groups.</p><h3>Engineering That Performs On the Water</h3><p>What sets Ronstan apart from generic marine suppliers is its deep commitment to innovation and in-house manufacturing capability. Ronstan&apos;s engineering teams — spread across Australia, the United Kingdom, and Denmark — draw on diverse sailing traditions to develop products that meet the demands of wildly different markets: from club dinghy racers to offshore bluewater cruisers. The brand&apos;s catalog spans blocks, winches, travelers, furling systems, batten systems, stainless steel rigging hardware, and a full suite of deck gear. Ronstan is also the official hardware supplier to the Australian Sailing Team.</p><p>The brand&apos;s in-house manufacturing includes precision CNC machining of aluminum, brass, and stainless steel, as well as advanced plastic injection molding using high-performance engineering polymers — including composites reinforced with up to 60% long-strand glass and carbon fiber. This vertical integration means Ronstan controls quality from design to delivery.</p><h3>Core Product Categories</h3><p>Three categories stand out as workhorses of the Ronstan lineup. <a href="/11561-ronstan-fairleads-200387">Ronstan Fairleads</a> are purpose-designed to guide, contain, and correct the lead angle of control lines across a range of deck configurations — a deceptively simple piece of hardware that plays a critical role in clean, friction-free sail handling. For securing lines under load, <a href="/11561-ronstan-cleats-200268">Ronstan Cleats</a> offer a comprehensive range spanning jam cleats, vee cleats, and the brand&apos;s well-known C-Cleat&trade; and T-Cleat&trade; cam cleat families, each engineered for reliable cleating and easy release in all conditions. Completing the rigging equation, <a href="/11561-ronstan-shackles-200937">Ronstan Shackles</a> — including the innovative Triggersnaps&trade; snap shackle range — are individually proof-load tested and designed for intuitive one-handed operation, making them a trusted choice for racers and cruisers alike.</p><h3>From Dinghies to Maxis</h3><p>One of Ronstan&apos;s most distinctive qualities is its breadth. The same brand that equips Olympic-class dinghies also supplies hardware to some of the largest and fastest offshore racing yachts in the world. Whether you&apos;re outfitting a small club boat or a serious offshore campaigner, Ronstan&apos;s catalog has a solution engineered to the right weight, load rating, and finish for the task at hand.</p>

Part Number

RF30101
09/13/2036 6:45 AM
Sale Price

$16.40

In Stock (7)

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Usually delivered within 2 days

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Fitment guaranteed

Fitment guaranteed

Product Details

The Ronstan Series 30 Ball Bearing Block with single loop top head fitting delivers high-performance, low-friction operation for dinghies, catamarans, and yacht control line systems. This compact 30mm block features a sophisticated 2-stage ball bearing system that maintains consistent performance across the full working load range.

Key Features:

  • Advanced 2-stage ball bearing system for minimal friction and consistent performance
  • High static and dynamic load capacity with 300kg (660 lbs) maximum working load
  • Breaking load of 750kg (1,650 lbs) for reliable safety margin
  • Lightweight construction at just 28g (1.0 oz)
  • Acetal or Torlon ball bearings for exceptional smoothness
  • Versatile loop top head fitting can accept a shackle in two planes for proper alignment
  • UV-stabilized Acetal sheave resists sun damage and degradation
  • Impact-modified, fiber-reinforced, UV-stabilized Nylon cheeks
  • Marine-grade 316 stainless steel load straps and fittings

Specifications:

  • Sheave Diameter: 30mm (1-3/16 inches)
  • Maximum Rope Diameter: 8mm (5/16 inches)
  • Maximum Working Load: 300kg (660 lbs)
  • Breaking Load: 750kg (1,650 lbs)
  • Weight: 28g (1.0 oz)

Applications:

  • Primary lead blocks on dinghies and catamarans
  • Control lines on larger yachts
  • Any application requiring lightweight, high-performance turning blocks

Ronstan's Series 30 blocks are engineered for sailors who demand reliability and performance. The combination of premium materials, precision ball bearings, and marine-grade hardware makes this block ideal for both racing and cruising applications.

It was okay. Product doesn't completely look brand new, but I hope it does the job.

Fast check out..

so far so good

Simple and efficient checkout.

In-depth details. Fair price. Convenience. Amazon compatibility. Very nice.

Just recieved my order and the pit jug and spout were perfect. The shipping was very fast and it was by far the best price I could get on these products. Autoplicity is great.

So far so good...

Fast

W]wwwwww

I have searched for this part all day I called and the people on the phone were very polite. If they have this part and ship it fairly quickly I will definitely be using this company in the future.

They had two items that I wanted in stock with the lowest price I've seen online anywhere, and had super affordable shipping options.

Authentic, hard to find item listed for the least expensive price online! Good customer service and fast shipping time!!

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