Ronstan Series 40 Ball Bearing Block - Single - Universal Head

Handle mainsheets, halyards, vangs and spinnaker control lines with the Ronstan Series 40 single ball bearing block. Its two-stage bearing system reduces friction across the load range, while the universal head lets sailors choose a fixed or swivelling attachment.

Key features

• Two-stage ball bearings keep the sheave running with low friction as loads change.
• Captive Lock universal head fixes in either of two planes or swivels freely to suit the installation.
• Openings in the cheeks provide access for bearing maintenance.
• A slotted shackle pin helps prevent lines from fouling.
• UV-stabilized sheaves and impact- and UV-resistant cheeks suit outdoor use.

Specifications

• Configuration: Single sheave, universal head
• Sheave diameter: 40 mm (1-9/16 in)
• Maximum rope diameter: 10 mm (7/16 in)
• Pin diameter: 5 mm (3/16 in)
• Maximum working load: 350 kg (770 lb)
• Breaking load: 1,000 kg (2,200 lb)
• Weight: 70 g (2.5 oz)
• Sheave material: UV-stabilized Acetal
• Ball bearing material: Acetal
• Cheek material: Fibre-reinforced Nylon
• Load strap and head fitting material: Grade 316 stainless steel

Good to know

Listed applications include mainsheet, halyard, vang and spinnaker controls on off-the-beach catamarans, one-design classes and sportsboats up to 8 m (26 ft).