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Ronstan RF35312 Series 30 Triple Block with Becket - Orbit Block 30mm

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

RF35312
09/11/2036 8:50 AM
Sale Price

$41.98

In Stock (10+)

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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 RF35312 is a high-performance 30mm triple block with becket, engineered for modern sailing rigging systems where strength-to-weight ratio is critical. This Orbit Block features three sheaves with thinner cheeks between them that reduce overall weight while effectively separating lines for tangle-free operation.

Advanced Two-Stage Bearing System:

The Orbit Block's innovative bearing design efficiently handles both static and dynamic loads throughout the entire load range. High compression grade acetal orbital ball bearings automatically migrate to loaded areas of the sheave for light to moderate loads, while a PTFE-impregnated nylon bearing with carbon fiber reinforcement shoulders larger static loads. This dual-stage system delivers smooth operation and exceptional efficiency even under significant load.

Lightweight Composite Construction:

Through extensive computer modeling, Ronstan replaced unnecessary metal components with engineered composites without compromising strength. The glass fiber reinforced nylon cheeks and head design achieve the highest working loads in their class. The hollow bearing at the center serves double-duty as a becket, further reducing weight while adding versatility. The block can be secured using the supplied loop or converted to a soft attachment using a Dyneema link (Ronstan RF9003-70, sold separately).

Key Features:

  • 30mm UV-resistant acetal sheaves compatible with 5/16" (8mm) conventional double-braid and high-tech 12-strand lines
  • Triple sheave configuration with integrated becket for complex purchase systems
  • Thinner cheeks between sheaves for weight reduction and line separation
  • Acetal ball bearings for light to moderate loads with PTFE/carbon fiber bearing for higher loads
  • Glass fiber reinforced nylon construction for exceptional strength-to-weight ratio
  • Accepts 5/32" shackle pin diameter
  • Optional soft attachment conversion with Dyneema link
  • Ideal for mainsheets, boom vangs, backstay systems, halyard tuning systems, Cunninghams, and general dinghy control lines

The RF35312 combines lightweight design with high working loads, making it an ideal solution for modern control line systems on dinghies through larger yachts where performance and weight savings both matter.

Products specifications

Diameter

5/16 Inch or 8 mm

Mount Type

Side Shackle

Type

Triple

Becket

Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

1213 Pounds

Sheave Diameter

1 3/16 Inches or 30 mm

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Best price shipped on my product period. MBRP light bar for my Wrangler JK. Product shipped day after order was placed and arrived 2 business days later. Product was as advertised. Best price, fast service= return customer. Thanks

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I saw nothing but good reviews and the money back guarantee, these together helped me finalize my decision to order from this site. I ordered just before the weekend started so I think it took my order a little longer to process. I was relieved to find that my order was shipped on the day I ordered it, It just took a little while for the email traffic to catch up. So far things have been good!!!

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