5/16" (8mm) Ronstan Single, loop head Utility Block

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316 Stainless steel cheeks and U.V. stabilised Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.


  • Lightweight durable construction
  • Economical
  • Maintenance free

Used for:

  • Vang, cunningham and trapeze retriever systems on dinghies
  • Leech line tackles, bunk adjusters etc on larger yachts
Reference Imperial Metric
Sheave Ø 1-1/8 in. 29 mm
 Max. Rope Ø  5/16 in. 8 mm
M.W.L. 660 lb. 300 kg
B. L. 1320 lb.  600 kg 
Weight 0.5 oz. 20 g
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