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Ronstan RF35100 Series 30 Orbit Block Single Sheave Ball Bearing Swivel Shackle

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

RF35100
05/31/2036 9:53 PM
Sale Price

$18.04

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Product Details

The Ronstan RF35100 Series 30 Orbit Block is a lightweight, high-strength single sheave block designed for modern rigging systems on dinghies and sailboats. This 30mm block features a swivel shackle head and integrated becket, making it ideal for barber haulers, boom vangs, spinnaker sheets, backstay systems, halyard tuning, and Cunningham controls.

Advanced Two-Stage Bearing System:

  • High compression acetal orbital ball bearings migrate to loaded areas for efficient handling of light to moderate loads
  • PTFE-impregnated nylon bearing with carbon fiber reinforcement supports higher static loads
  • Smooth operation throughout the entire load range with exceptional efficiency

Engineered for Performance:

  • Glass fiber reinforced nylon cheeks and head provide exceptional strength-to-weight ratio
  • Hollow bearing center serves as an integrated becket, reducing weight while adding versatility
  • UV-resistant acetal sheave compatible with conventional double braid and high-tech 12-strand lines
  • Swivel shackle head with 5/32" pin diameter for easy attachment
  • Optimized for 5/16" (8mm) line diameter

Construction:

  • Composite cheeks with glass fiber reinforcement
  • Acetal sheave with high compression rating
  • Carbon fiber reinforced bearing surfaces
  • Stainless steel shackle pin

The RF35100 delivers the highest working load capacity in its class while maintaining minimal weight. The innovative design replaces unnecessary metal components with engineered composites, creating a compact block that excels in demanding marine environments. Whether used on racing dinghies or cruising yachts, this Orbit Block provides reliable performance for critical control line applications.

Products specifications

Type

Single

Diameter

5/16 Inch or 8 mm

Mount Type

Swivel Shackle

Weight

0.07

Becket

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

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