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 high strength aluminium dog bone.
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 high strength aluminium 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 high strength aluminium dog bone
Drawing on the expertise of Nodus Factory,
many design iterations were tested before
finalising specifications of the Dyneema®
SK99 cord shackle and high strength aluminium dog bone.
Proprietary Nodus Factory splicing techniques
and fibre surface coating ensure secure
load transfer from the block and maximum
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
• 2:1 Main halyards
• Headsail and spinnaker sheets
• Mast base halyard deflection
• Running backstays
|Sheave Ř||- in.|
|Max. Rope Ř||- in.|
|Max. Cable Ř|| in|
|Pin Ř|| in.|
|B. L.||8820 lb.|
- Ideal for lead or floating blocks for headsail sheet trimming
- Mast base blocks
- Temporary lead blocks for sheet deflection, barber haulers and tack lines
- 2:1 Main halyards
- Spare or replacement block for general use