Ronstan Series 25 Ball Bearing Orbit Block - Becket Swivel Shackle [RF28100]

Series 25 Ball Bearing Orbit Block™ - Becket & Swivel ShackleSingle sheave ball bearing block with becket hub and swivel shackle head. Series 25 Ball Bearing Orbit Blocks™, delivering superior strength, reduced weight, and exceptional performance for high-demand dinghy and small boat applications.Designed with competitive sailors and performance boats in mind, these compact 25mm blocks are engineered to achieve the highest possible strength-to-weight ratio. Featuring Ronstan’s renowned high compression strength acetal bearing system, the Series 25 BB Orbit Blocks™ are a lightweight yet durable solution, ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, cunninghams, and cascading vangs on dinghies up to 4 meters.Each block has a stainless steel hub for versatile lashing attachments and through-sheave becket functionality, making them adaptable to a wide range of rigging setups. The hub accommodates up to 4mm (5/32") lashing and ensures maximum efficiency without compromising reliability.Features: 2-stage ball bearing system. Suits up to 8mm (5/16”) lines. Hollow hub for becket take-off. Lashing blocks suit up to 4mm (5/32”) lashing. Specifications: Max. Rope diameter (in): 5/16 M.W.L. (lb): 500 Sheave diameter (in): 1 B.L. (lb): 990 Weight (oz): 0.6 Applications: Mainsheet and spinnaker sheet turning blocks on dinghies to 4m (13ft). Control lines. Cascading vangs. Leech lines & cunninghams. Materials: Frame/cheeks: Toughened, glass fibre reinforced nylon. BB Sheave and balls: high compression strength acetal.

Brand: Ronstan Category: Blocks SKU: MM-110653 Options: 1 Availability: Available for sale

Need help confirming whether Blocks is the right fit? Contact Marinautical before ordering if you need help with compatibility, mounting, replacement matching, or marine-use recommendations. Product handle: ronstan-series-25-ball-bearing-orbit-block-becket-swivel-shackle-rf28100

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