Selden BBB40 Fiddle Ball Bearing Block with Cam Cleat & Swivel – 40 mm / 20 mm

The Selden BBB40 fiddle ball bearing block with cam cleat and swivel is designed for cascading and fine-tuning systems where speed, control and compact rigging are essential. The fiddle configuration combines a 40 mm primary sheave with a smaller secondary sheave, enabling efficient load distribution and optimized mechanical advantage in limited space.

The integrated cam cleat allows quick line adjustment and immediate locking without additional hardware, making this block ideal for active sailing and racing applications. The cleat arm is adjustable for ergonomic positioning and efficient handling.

Both sheaves run on stainless steel ball bearings, ensuring smooth rotation and minimal friction under dynamic loads. The swivel head provides optimal alignment and can be fixed or left free to rotate depending on the setup.

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

Key features:

• Fiddle block with integrated cam cleat
• Fast trimming and secure line locking
• Swivel head for optimal alignment
• Stainless steel ball bearings for low friction
• Compact design for cascading systems

Technical specifications:

• Sheave diameter: 40 mm (main)
• Max line diameter: 7 mm
• Safe working load: 250 kg
• Breaking load: 500 kg
• Pin diameter: 4 mm
• Shackle diameter: 4 mm
• Weight: approx. 208 g

Applications:

• Cascading and fine-tuning systems
• Outhaul and Cunningham setups
• 3:1 / 4:1 purchase systems with cleating
• Dinghies and performance keelboats