Selden BBB40 Single Ball Bearing Block with Becket & Strap – 40 mm

The Selden BBB40 single ball bearing block with becket and strap is designed for trimming and control systems where a fixed attachment and additional purchase capability are required. The combination of a stainless steel strap and integrated becket provides a compact and robust solution for efficient rigging setups.

The becket allows for additional purchase configurations (typically 2:1 or 3:1), making this block suitable for applications where mechanical advantage is needed without increasing system complexity.

The 40 mm sheave runs on stainless steel ball bearings, ensuring smooth rotation and minimal friction under dynamic loads. This improves trimming efficiency and reduces effort when handling control lines.

The fixed strap connection offers a strong and stable mounting solution with no moving parts, ideal for applications where load direction remains constant. The strap can also be removed during installation if required, offering additional flexibility in mounting setups.

Constructed from glass fibre reinforced composite with an acetal bearing cage, the block delivers high strength, low weight and long-term durability in demanding marine environments.

Key features:

• Single block with integrated becket and strap
• Suitable for compact purchase systems (2:1 / 3:1)
• Stainless steel ball bearings for smooth operation
• Fixed mounting for maximum reliability
• Lightweight and durable composite construction

Technical specifications:

• Sheave diameter: 40 mm
• Max line diameter: 10 mm
• Safe working load: 250 kg
• Breaking load: 500 kg
• Weight: approx. 130 g

Applications:

• Mainsheet and control line systems
• Vang and Cunningham setups
• Fixed rigging points with purchase systems
• Dinghies and small to mid-size keelboats