7/16" (10mm) Ronstan Single Loop Head Block

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  • Exceptionally high working loads
  • Low maintenance, long service life
  • Self-lubricating sheave


  • U.V. stabilised Acetal sheaves
  • Impact and U.V. resistant, fibre reinforced Nylon cheeks
  • Grade 316 stainless steel bearing race
  • Grade 316 stainless steel load strap and head fitting
  • Impact and UV resistant, fibre reinforced Nylon cheeks

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.



Reference Imperial Metric
Sheave Ø 1-9/16 in. 40 mm
Max. Rope Ø 7/16 in. 10 mm
Pin Ø 3/16 5 mm
M.W.L. 880 lb. 400 kg
B. L. 2200 lb. 1000 kg
Weight 1.9 oz. 54 g
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