Ronstan Series 40 Orbit BB Double Block with Becket & Swivel Shackle

Series 40 Orbit BB Double Block with Becket Swivel Shackle

The Series 40 ball-bearing Orbit Blocks provides the perfect balance of strength, performance, and reliability. They offer class-leading dynamic and static load ratings, the highest available in this size of performance blocks. Lightweight and strong toughened glass fiber reinforced nylon cheeks replace stainless steel straps used in traditional utility blocks - the perfect balance of performance and reliability.

As well as traditional single swivel blocks, the range includes single and double sheave lashing or soft attachment options through to multiple sheave blocks including those with quad and quin sheaves. The range is highly versatile allowing a multitude of possible systems right up to a 12:1 purchase mainsheet system for off-the-beach performance catamarans.

Series 40 Orbit Blocks are fitted with our carbon-reinforced C-Cleat for secure rope holding with low entry and exit efforts, and fairleads for fast action from any angle. Cleat arms are made from stainless steel and adjustable for setting your preferred cleating angle.

Ball Bearing versions incorporate our 2-stage bearing system using ball bearings to minimize friction and a secondary full-contact bearing to maintain low friction across the full working load range.

High Load versions are designed specifically for any application where high dynamic or static loads are expected. They feature a high-strength grade 2205 stainless steel sheave hub together with a triple bearing race to maintain low friction at very high loads.

Features:

• Class-leading dynamic and static load ratings
• Lightweight, yet strong. Toughened, glass fiber reinforced nylon replaces stainless steel straps used in our traditional utility blocks
• Low friction 2-stage ball bearing system for efficient and effortless trimming
• Soft attachment, lashing and traditional swivel shackle head options
• Low profile and compact
• High performance cleating

Applications

• Mainsheet systems and spinnaker sheets on dinghies, off-the-beach catamarans and sportsboats to 8m (26ft)
• Halyard, vang and backstay applications on boats to 9m (30ft)
• Control line applications on larger yachts

Specifications:

• Sheave : 1-9/16 in.
• Max. Rope : 3/8 in.
• Pin : 5/32"
• M.W.L.: 1320 lb.
• B. L.: 2650 lb.
• Weight: 4.6 oz.

The Ronstan Series 40 Orbit BB Double Block with Becket & Swivel Shackle offers a perfect combination of strength, performance, and reliability for demanding sailing applications. Designed with class-leading dynamic and static load ratings, this performance block is ideal for a variety of marine systems, providing exceptional durability and efficiency. Crafted with toughened glass fiber reinforced nylon cheeks, it replaces traditional stainless steel straps, resulting in a lightweight yet strong construction that enhances overall performance.

Equipped with a low-friction 2-stage ball bearing system, the Series 40 Orbit Block minimizes effort during trimming and maneuvering, making sail adjustments smoother and more precise. The inclusion of a secondary full-contact bearing ensures low friction across the entire working load range, supporting high-performance sailing conditions. The block’s versatile design includes options for soft attachments, lashing, and traditional swivel shackles, allowing customization to fit different rigging setups. Its compact, low-profile profile is suitable for a wide range of applications, from dinghy mainsheets to larger yacht control lines.

Designed for high load environments, the Series 40 Orbit Block features a high-strength 2205 stainless steel sheave hub and a triple bearing race to maintain low friction at very high loads. The integrated carbon-reinforced C-Cleat provides secure rope holding with minimal effort for cleating, while fairleads enable quick action from any angle. This combination of features ensures reliable, effortless operation whether used for mainsheets, spinnaker sheets, halyards, vang, backstays, or control lines on boats up to 30 feet. The robust construction and high-performance features make this block an essential component for serious sailors seeking durability and efficiency.

With a 1-9/16 inch sheave that accommodates ropes up to 3/8 inch in diameter, the Ronstan Series 40 Orbit BB Double Block can handle a working load limit of 1,320 pounds and a breaking load of 2,650 pounds. Weighing just 4.6 ounces, it offers excellent strength-to-weight ratio, ensuring reliable performance without adding unnecessary weight to your rigging system. Whether upgrading existing hardware or outfitting a new sailboat, this high-quality block delivers superior performance, durability, and ease of use for a wide range of sailing applications.

Features:

• Class-leading dynamic and static load ratings for demanding sailing conditions

• Lightweight, yet durable construction with toughened glass fiber reinforced nylon cheeks

• Low friction 2-stage ball bearing system for effortless trimming and maneuvering

• Flexible attachment options including soft lashing and traditional swivel shackle heads

• Compact, low-profile design suitable for various sailing setups

• High-performance cleating with integrated carbon-reinforced C-Cleat for secure rope hold