Ronstan Series 40 Orbit BB Quad Block w/Swivel Shackle

The Series 40 Orbit BB Quad Block with Swivel Shackle is engineered for marine enthusiasts seeking unparalleled strength, performance, and reliability. Perfectly suited for a variety of boating applications, this high-performance block ensures efficient and effortless trimming, making it an essential component for both casual sailors and competitive racers.

Unmatched Strength and Durability

The Series 40 Orbit BB Quad Blocks™ stand out with their class-leading dynamic and static load ratings, offering the highest performance in their category. Constructed with lightweight yet robust toughened glass fiber reinforced nylon cheeks, these blocks replace traditional stainless steel straps, providing an optimal balance between strength and durability.

Advanced Ball Bearing System

Equipped with a low friction 2-stage ball bearing system, the Series 40 Orbit Blocks™ ensure smooth and efficient operation under varying loads. The primary ball bearings minimize friction during trimming, while a secondary full-contact bearing maintains low friction across the entire working load range, enhancing overall performance.

Versatile Sheave Options

Our extensive range includes:

• Single swivel blocks
• Single and double sheave lashing or soft attachment blocks
• Multiple sheave blocks, including quad and quint sheaves
• Systems compatible with up to a 12:1 purchase mainsheet for off-the-beach performance catamarans

This versatility allows for the creation of complex and efficient rigging systems tailored to your specific needs.

Secure and Efficient Cleating

Series 40 Orbit Blocks™ feature our innovative carbon-reinforced C-Cleat™ system, providing secure rope holding with minimal effort during entry and exit. The stainless steel cleat arms are adjustable, allowing you to set your preferred cleating angle for optimal performance. Additionally, the inclusion of fairleads ensures fast and reliable action from any angle.

High Load Performance

Designed for applications demanding high dynamic or static loads, the High Load versions of the Series 40 Orbit Blocks™ incorporate:

• High-strength grade 2205 stainless steel sheave and hub
• Triple bearing race system to maintain low friction under very high loads

These enhancements ensure that the blocks perform reliably even in the most demanding marine environments.

Key Features

• Top-Tier Load Ratings: Class-leading dynamic and static load capacities ensure reliability and safety.
• Lightweight Construction: Toughened glass fiber reinforced nylon cheeks reduce weight without sacrificing strength.
• Efficient Bearing System: 2-stage ball bearing system minimizes friction for smooth operation.
• Flexible Attachment Options: Choose from soft attachment, lashing, or traditional swivel shackle heads.
• Compact Design: Low profile ensures easy installation and compatibility with various rigging setups.
• High-Performance Cleating: Carbon-reinforced C-Cleat™ for secure and effortless rope management.

Ideal Applications

• Mainsheet Systems & Spinnaker Sheets: Perfect for dinghies, off-the-beach catamarans, and sportsboats up to 8m (26ft).
• Halyard, Vang, and Backstay: Suitable for boats up to 9m (30ft).
• Control Lines: Efficient handling for larger yachts.

Technical Specifications

Specification	Details
Sheave Diameter	1-9/16 in.
Maximum Rope Diameter	3/8 in.
Pin Diameter	5/32 in.
Maximum Working Load (MWL)	1,320 lb.
Breaking Load (B.L.)	2,650 lb.
Weight	6.8 oz.

Why Choose Series 40 Orbit BB Quad Blocks?

Choosing the Series 40 Orbit BB Quad Blocks™ means investing in top-tier marine hardware that delivers exceptional performance, reliability, and versatility. Whether you're upgrading your current rigging system or outfitting a new vessel, these blocks provide the strength and efficiency required for optimal sailing performance.

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.