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Ronstan RF35151 Series 30 Ball Bearing Orbit Block Cheek 30mm

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

RF35151
07/13/2036 9:35 AM
Sale Price

$14.58

In Stock (10+)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Ronstan RF35151 Series 30 Orbit Block is a lightweight, high-performance 30mm cheek block designed for modern sailing rigging systems. This versatile block excels at turning lines along deck surfaces and flat mounting applications, making it ideal for barber-haulers, downhauls, travelers, outhauls, and control line systems on dinghies through larger yachts.

Advanced Two-Stage Bearing System:

Ronstan engineered the Orbit Block series to deliver the highest strength-to-weight ratio in its class. The innovative two-stage bearing system provides exceptional efficiency across 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 full-contact PTFE-impregnated nylon bearing with carbon fiber reinforcement handles higher static loads with ease.

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 can be secured using the supplied loop or converted to soft attachment with a Dyneema link for further weight reduction. The hollow bearing at the sheave center serves double-duty as a becket, adding versatility while minimizing weight.

Key Features:

  • 30mm UV-resistant acetal sheave compatible with 5/16" (8mm) conventional doublebraid and high-tech 12-strand lines
  • Shackle pin diameter: 5/32"
  • Highest working loads in class with exceptional strength-to-weight ratio
  • Dual bearing system optimizes performance under both static and dynamic forces
  • Hollow sheave bearing doubles as becket attachment point
  • Glass fiber-reinforced nylon cheeks for durability
  • Optional angled pad compatibility for improved line scope
  • Convertible attachment: supplied loop or soft Dyneema link

The RF35151 delivers smooth, efficient line handling even under larger loads, making it an ideal solution for modern control line applications where weight savings and performance are equally critical.

Products specifications

Diameter

5/16 Inch or 8 mm

Mount Type

Mechanical Fasteners

Type

Single Cheek/Foot

Becket

No Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

661 Pounds

Sheave Diameter

1 3/16 Inches or 30 mm

Easy internet access. fast shipping. justlike the advertise.

Quick and easy

Fast,prompt service and delivery. Very pleased.

Good

Very high level of responsive customer service, wow! And the items arrived immediately, so fast I thought there might be a mistake. :D<br>thx Sean!

good price on intake.shipping to high on other items

Great prices, quick shipping, customer service a bit difficult to reach. But, after reaching customer service, issue was resolved without a problem.

great place to order honda parts from ! i will definitely use this siye in the future

price was great

I assume that the parts are for the driver side and passenger side lower control arm, even though it is not specifically stated . It would be much clearer if it stated this in ad. Thanks DPL

Easy, fast and very helpful via phone

Great Prices

Best price I could find! Shipped through UPS, great service.

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