Selden BBB30 Single Cheek Ball Bearing Block 30 mm – Deck Mount

The Selden BBB30 single cheek ball bearing block (403-101-09) is designed for fixed mounting on flat surfaces such as decks, masts or cockpit structures.

This cheek block is secured with two M4 fasteners and provides a compact, low-profile solution for guiding control lines in a fixed position. It is ideal where the line direction is constant and a stable installation is required.

With a 30 mm sheave and stainless steel ball bearings, the block ensures smooth and efficient operation with minimal friction, even under dynamic loads and frequent adjustments.

Part of the Selden BBB30 series, this block is designed for higher loads than the BBB20 range and is suitable for dinghies and small sailing yachts.

Key features

• Single cheek block for fixed mounting
• Sheave diameter: 30 mm
• Maximum line diameter: 8 mm
• Safe working load: 200 kg
• Breaking load: 400 kg
• Weight: approx. 22–23 g
• Mounting: 2 x M4 bolts

Construction & materials

• Stainless steel ball bearings for minimal friction
• Glass fibre reinforced sheave for durability under load
• Composite housing (glass fibre reinforced polyamide)
• Acetal bearing cage to reduce friction and weight

Applications on board

• Deck-mounted line guidance
• Mast and boom installations
• Control lines with fixed direction
• Dinghies and small sailing yachts

This block is ideal where a compact, low-profile and permanently mounted solution is required for efficient line guidance.