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Ronstan RF35140 Series 30 Orbit Single Block with Stand Up Swivel

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

RF35140
09/12/2036 10:36 AM
Sale Price

$22.73

In Stock (7)

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Usually delivered within 2 days

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Fitment guaranteed

Fitment guaranteed

Product Details

The Ronstan RF35140 Series 30 Orbit Block is a lightweight, high-performance single block with stand-up swivel designed for modern sailboat rigging systems. With a 30mm sheave diameter, this block is ideal for mainsheets and control line turning blocks mounted low in the cockpit, making it a versatile workhorse for dinghies and larger sailing vessels.

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 automatically adapts to load conditions: high-compression acetal orbital ball bearings 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 exceptional efficiency.

Lightweight Composite Construction:

Through extensive computer modeling, Ronstan replaced unnecessary metal components with engineered glass fiber reinforced nylon cheeks and head design without compromising strength. The hollow bearing at the center of the sheave serves 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 for additional weight savings.

Key Features:

  • 30mm UV-resistant acetal sheave compatible with 5/16" (8mm) conventional doublebraid and high-tech 12-strand lines
  • Stand-up swivel for optimal alignment in dynamic sailing conditions
  • Dual-stage bearing system for smooth operation under varying loads
  • Glass fiber reinforced nylon construction for superior strength-to-weight ratio
  • Hollow bearing center serves as integrated becket
  • Compatible with 5/32" shackle pin diameter
  • Highest working loads in its class
  • Ideal for dinghy control line systems and yacht applications

The RF35140 delivers professional-grade performance in a compact, lightweight package that excels in both racing and cruising applications.

Products specifications

Diameter

5/16 Inch or 8 mm

Mount Type

Mechanical Fasteners

Type

Single Pivoting

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

so far so good and a good price

Easy-peezay

Product as described. Customer Service very helpful. Will shop again.

Quick and easy. No mess, no fuss

Great prices and delivery as stated.

Quick and easy so far

smooth

Shopping was easy

Good service and pricing

Easy and fair pricing.

awesome

Lowest price on the net for what I purchased and received it within 3 days of placing order. Great website, great prices, & reasonable shipping charges.

In a rush to get my car up and running, Autoplicity had the best price on the items I needed, and in stock as well as shipped quickly. Just what I was looking for, thanks!

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