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Ronstan RF51200 Series 50 Double Block with Swivel Shackle Head

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

RF51200
06/14/2036 8:11 AM
Sale Price

$72.59

In Stock (6)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Ronstan Series 50 All Purpose Double Block delivers exceptional performance for cruising and racing sailboats up to 33 feet. This versatile marine block features self-lubricating Acetal polymer sheaves running on polished stainless steel races, providing smooth operation under both dynamic and high static loads. The swivel shackle head allows full 360-degree rotation for optimal line management.

Key Features:

  • Double sheave configuration with 2-inch (50mm) diameter sheaves
  • Exceptionally high working load of 2,200 lbs (1,000 kg) with 4,410 lb breaking strength
  • Self-lubricating Acetal polymer sheaves ensure low friction and extreme durability
  • Slotted pin shackle design eliminates fouled lines
  • Non-locking swivel head provides 360-degree rotation
  • Low maintenance design for long service life

Construction:

  • Grade 316 stainless steel load strap for superior corrosion resistance
  • Impact and UV resistant fiber-reinforced Nylon cheeks
  • Polished stainless steel races for smooth sheave operation
  • 1/4-inch (6mm) pin diameter

Applications:

  • Mainsheet and halyard systems
  • Vang and spinnaker control lines
  • General sheet and control line applications on boats up to 33 feet (10m)

Specifications:

  • Maximum rope diameter: 1/2 inch (12mm)
  • Weight: 9.0 oz (255g)
  • Maximum working load: 2,200 lbs (1,000 kg)
  • Breaking load: 4,410 lbs (2,000 kg)

Ideal for sailors demanding reliable, high-performance blocks for their control line systems, the Ronstan RF51200 combines durability with smooth, low-friction operation.

Products specifications

Type

Double

Diameter

1/2 Inch or 13 mm

Mount Type

Swivel Shackle

Ball Bearings

Low Friction Bearings

Becket

No Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

2200 Pounds

Sheave Diameter

50 mm

good prices

best price on a Tru-cool H7B transmission cooler

Shall update after receiving the part and being able to use it

Easy and accurate.

Couldn't check out using my amazon account.

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