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Ronstan RF417 Series 30 Double Utility Block with Tube Rivet

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

RF417
09/12/2036 7:09 AM
Sale Price

$17.64

3 left at this price

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Ronstan RF417 is a Series 30 double utility block featuring a hollow tube rivet design that provides versatile mounting options for sailing applications. This compact marine block combines stainless steel cheeks with UV-stabilized Acetal sheaves for reliable performance in demanding marine environments.

Key Features:

  • Double sheave configuration for 2:1 purchase systems
  • Hollow tube rivet accepts fixing screws, shackles, or serves as a becket attachment point
  • Grade 316 stainless steel cheeks for corrosion resistance
  • UV-stabilized Acetal sheaves for long-lasting durability
  • Lightweight yet durable construction
  • Maintenance-free operation with no lubrication required

Common Applications:

  • Vang, cunningham, and trapeze retriever systems on dinghies
  • Leech line control tackles on sailboats
  • Bunk adjusters and utility systems on larger yachts
  • General-purpose control line routing

The Series 30 utility blocks are designed for economical performance where space is limited and moderate loads are expected. The combination of stainless steel and Acetal materials ensures years of reliable service with virtually no maintenance required.

Products specifications

Type

Double

Diameter

5/16 Inch or 8 mm

Mount Type

Fixed Lashing Eye

Becket

No Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

990 Pounds

Sheave Diameter

28 mm

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fast easy

Reasonable price and easy shopping

I need ASP Thans

Disapointed that the price increased from one day to next. The packaging was poor and the adapter/cover plate for battery was broken due to poor packaging. I did not need Brocken part in my application. The poor packing will influence my next battery purchase, which will be in a few months due to nature of 2 battery system in my truck.

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