CW55175 - Ronstan Series 30 Stand Up Swivel Ball Bearing Block

Ronstan Series 30 Stand Up Swivel Ball Bearing Block

The Ronstan Series 30 Ball Bearing Orbit Block is engineered for high performance with a superior strength-to-weight ratio. Utilizing advanced composite materials, this block is designed to minimize friction while maintaining a lightweight structure. Featuring multiple attachment options and precision bearings, it is perfect for a variety of marine applications.

Applications:

• Ideal for mainsheet and spinnaker systems on dinghies up to 5M (16')
• Suitable for halyard, vang, and backstay applications on vessels up to 5M (16')
• Effective for control line applications on larger yachts

Materials:

• Sheave: High compression strength carbon black Acetal
• Ball Bearings: High compression strength Acetal
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
• Link: UV stabilized, multi-strand impregnated SK75 Dyneema®

Specifications:

• Sheave Ø: 30mm (1-3/16")
• Max. Rope Ø: 8mm (5/16")
• M.W.L.: 300kg (660lbs)
• B. L.: 600kg (1,320lbs)
• Weight: 33g (1.2oz)

The Ronstan Series 30 Stand Up Swivel Ball Bearing Block, part number CW55175, is a specialized component designed for marine applications requiring efficient rope management and load bearing. This block features a 30mm Acetal sheave and high compression strength Acetal ball bearings, housed within a toughened, glass fiber reinforced Nylon frame. Its design prioritizes a high strength-to-weight ratio, making it suitable for reducing friction and managing lines without adding significant mass. It is engineered for use in mainsheet and spinnaker systems on dinghies up to 5 meters (16 feet), and can also be integrated into halyard, vang, and backstay applications on similarly sized vessels. Additionally, it serves effectively in control line systems on larger yachts. The block's construction, including a UV stabilized SK75 Dyneema link, ensures durability and reliable performance in demanding marine environments.