5/16" (8mm) Ronstan Single, Ball Bearing, Lead Block

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Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision moulded Acetal sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.

Used for:

  • Typically used for halyards at the mast base.


  • Acetal ball bearings
  • UV stabilised Acetal sheave
  • Grade 316 stainless steel load housing



Reference Imperial Metric
Sheave Ø 1-3/16 in. 30 mm
Max. Rope Ø 5/16 in. 8 mm
Pin Ø 5/32 in. 4 mm
M.W.L. 660 lb. 300 kg
B. L. 1650 lb. 750 kg
Weight 1.1 oz. 30 g
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