Ronstan Series 40 Orbit BB Quin Block w/Swivel Shackle

The Series 40 Orbit BB Quin Block with Swivel Shackle is engineered to deliver unparalleled strength, performance, and reliability for marine applications. Designed for the demanding environment of boating and sailing, these high-performance blocks feature class-leading dynamic and static load ratings, ensuring they can handle the most strenuous tasks with ease.

Unmatched Strength and Durability

The Series 40 Orbit Blocks™ set a new standard in marine hardware, offering the highest dynamic and static load ratings available in their size category. Constructed with lightweight yet robust toughened glass fiber reinforced nylon cheeks, these blocks eliminate the need for traditional stainless steel straps, providing a superior balance of strength and weight efficiency.

Versatile Sheave Configurations

Whether you require a single swivel block or a complex sheave system, the Series 40 Orbit Blocks™ range offers a variety of configurations to suit your needs. Options include single and double sheave lashing or soft attachments, as well as multiple sheave blocks featuring quad and quin sheaves. This versatility supports a wide range of systems, including up to a 12:1 purchase mainsheet system, ideal for high-performance catamarans operating off-the-beach.

Smooth and Secure Operation

Equipped with the innovative carbon-reinforced C-Cleat™, the Series 40 Orbit Blocks™ ensure secure rope holding while minimizing effort during rope entry and exit. The stainless steel cleat arms are adjustable, allowing you to set your preferred cleating angle for optimal performance. Additionally, the integrated fairleads provide fast and reliable action from any angle, enhancing overall system efficiency.

Advanced Bearing Systems

The ball-bearing variants of the Series 40 Orbit Blocks™ incorporate a two-stage bearing system. The primary ball bearings reduce friction, while a secondary full-contact bearing maintains low friction across the entire working load range. This combination ensures smooth and efficient trimming, even under heavy loads.

High Load Capability

For applications demanding exceptional load handling, the High Load versions of the Series 40 Orbit Blocks™ are specifically designed to meet these challenges. Featuring grade 2205 stainless steel sheaves and hubs, alongside a triple bearing race, these blocks maintain low friction even under very high dynamic and static loads.

Key Features

• Class-leading dynamic and static load ratings
• Lightweight, durable construction: Toughened glass fiber reinforced nylon cheeks replace stainless steel straps
• Two-stage ball bearing system: Minimizes friction for efficient trimming
• Multiple attachment options: Soft attachments, lashings, and traditional swivel shackles
• Low profile and compact design
• High-performance C-Cleat™: Secure rope holding with adjustable cleating angle

Ideal Applications

• Mainsheet systems and spinnaker sheets: Suitable for dinghies, off-the-beach catamarans, and sportsboats up to 8m (26ft)
• Halyard, vang, and backstay applications: Perfect for boats up to 9m (30ft)
• Control line systems: Excellent for larger yachts requiring precise control

Specifications

Parameter	Specification
Sheave Diameter	1-9/16 in.
Maximum Rope Diameter	3/8 in.
Pin Diameter	5/32 in.
Minimum Working Load (M.W.L.)	1320 lb.
Breaking Load (B.L.)	2650 lb.
Weight	8.5 oz.

Upgrade your marine hardware with the Series 40 Orbit BB Quin Block with Swivel Shackle, and experience top-tier performance and reliability on every voyage.

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.