Ronstan Shocks - Sheaveless Blocks 500kg

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Ronstan Shocks - Sheaveless Blocks 500kg

Ronstan Shocks - Sheaveless Blocks. With no moving parts Shocks provide ultimate durability and are maintenance free.. They are ideal where the sand and grit would compromise a bearing system or where regular flushing out isn't possible. Their gentle 3 dimensional geometry is kind on lines, but strong enough to cope with poor leads. 

Shocks are designed primarily for 'soft attachement', spliced to a line end or lashed in place. The elongated attachment aperture is ideal for webbing attachments, ensuring the intended orientation is maintained. 

The applications for Shocks are virtually limitless, including numerous high performance dinghies and small sailboats rigging applications including trapezes, cunninghams, barber haulers and kite bridles. They are also handy on larger boats for uses such as lazy jacks, sail covers, tie-downs, ladders and motor hoists. 

While the Shock only weights 12gms, they have outstanding performance in strength and weight stakes. These Shocks will accept lines from 3.0 to 10.0mm and are available in Red and Blue. 


  • Performance & versatility
  • Ultra lightweight
  • Ultra compact
  • Durable
  • Colour coded
  • Impact resistant
  • Small line optimised
  • High load capacity
  • Poor alignment tolerant
  • Soft attachment compatible
  • Grit & salt resistant
Rope Ø 3.0-10 mm
Height 14.5 mm
Width 24.8 mm
Length 36 mm
Fastener Ø mm
Fastener Hole Centres mm
M.W.L. 500kg
B. L. 1000 kg
Weight 12 g