Ronstan Series 40 Orbit Ratchet Block, Single Auto Swivel Shackle

The Ronstan Series 40 Orbit Ratchet Block is an automatic, load-sensing single block featuring a swivel shackle head. Its advanced ratchet mechanism automatically engages under load and disengages when released, allowing for smooth, rapid sheet movement ideal for gybing asymmetric spinnakers or managing mainsheet systems.

Key Features:

• Up to 14:1 holding power with Generation 2 cross-hole sheave geometry.
• Automatic load-sensing ratchet engagement.
• Swivel shackle head for unlimited block rotation.
• Durable stainless steel shackle head.
• Hard-anodized aluminum sheave with high-compression carbon black Acetal ball bearings.
• Glass fiber reinforced nylon frame and cheeks.
• UV-stabilized SK75 Dyneema link for secure attachment.

Technical Specifications:

• Sheave diameter: 40 mm (1-9/16 in.)
• Maximum rope diameter: 9 mm (5/16 in.)
• Maximum working load (M.W.L.): 175 kg (385 lbs.)
• Breaking load (B.L.): 500 kg (1,100 lbs.)
• Weight: 44 g (1.5 oz.)

Applications: Suitable for dinghy mainsheet systems, fine-tune systems on sportsboats and small keelboats, and control line applications on larger yachts.