Product Details
S40 Soft Attachment Block for 3/4" D Lines by Ronstan®. Designed from the outset to deliver outstanding performance, these blocks achieve the highest ratings for dynamic load vs sheave diameter in our keelboat block range. They are built to perform and built to last. Every SA Block features fully machined, anodised aluminium cheek plates. Sheaves run on duplex stainless steel hubs and incorporate precision composite journal bearings and thrust washers. The soft attachment is a purpose designed Dyneema® SK99 cord shackle with titanium dog bone.
Specifications
| Breaking Load: 30860 lb |
| Maximum Line Diameter: 3/4" |
| Maximum Working Load: 15430 lb |
| Sheave Diameter: 2-15/16" |
| Weight: 26.6 oz |
Features
- High quality at an affordable price
- Expertly made from premium materials
- Built to match your exact requirements
Ultimate dynamic and static load performance
SA Blocks incorporate a full contact, selflubricating composite journal bearing running on a polished duplex stainless steel hub, to maintain low friction performance under heavy dynamic and static loads.
Thrust washers in the same composite material are positioned between the sheave and the cheek plates to handle the high side loads that can be generated when line entry and exit alignment is not ideal. Testing has shown reduced friction and greater durability than ball bearings in this application.
Attach, detach and open
The soft shackle provides a simple means of attachment, secured with the titanium dog bone but easily opened when necessary to detach the block.
With the shackle open a gentle rotation of the cheek plates opens the head of the block so it can be fitted to a standing line. To close the block, rotate the cheeks back to the closed position until the spring loaded ball lock secures them in place. No additional external straps or bands required.
Soft shackle with titanium dog bone
Drawing on the expertise of Nodus Factory, many design iterations were tested before finalising specifications of the Dyneema® SK99 cord shackle and titanium dog bone. Proprietary Nodus Factory splicing techniques and fibre surface coating ensure secure load transfer from the block and maximum durability.
Aluminium alloy cheek plates & sheaves
Block cheeks and sheaves are precision machined from high strength aluminium alloy, then anodised for durability and corrosion resistance. The soft attachment through the hub provides a protective buffer between the block and boat surfaces. Retaining guides in soft elastomer ensure that the block remains aligned within the soft shackle.
A multitude of applications
Suited to temporary or permanent line deflection, load carrying and snatch block applications including:
- 2:1 Main halyards
- Headsail and spinnaker sheets
- Mast base halyard deflection
- Running backstays
The sailboat hardware market and the architectural rigging market are worlds apart, but in Australia they're both dominated by one powerhouse player. Ronstan® end-to-end design, manufacture and distribution operation has grown to become the only serious competitor. Ronstan head office in Melbourne, Australia is home to Ronstan state-of-the-art design and manufacturing facilities, and Ronstan advanced warehousing and global distribution system. Ronstan home market is further supported by sales offices in Sydney, Brisbane and Perth. Internationally, Ronstan one of the top three sailboat hardware brands in the world, instantly recognised and respected in 45 countries. Ronstan passionate team has worked tirelessly to develop export markets, establishing manufacturing facilities in Denmark and Indonesia and sales offices and distribution facilities in the United States - all the while building strong relationships with Ronstan distribution partners around the world.