Ronstan Block Orbit 30mm Fixed Head Linked

$33.95/ EACH

Code: 21-35284

Ronstan's Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available, achieved through all-composite reinforced polymer materials and multiple attachment options. Their precision design provides the optimum number of ball bearings for minimum friction while weight reduction is achieved through the use of fiber-reinforced composites in the block head, cleat arms and beckets. These blocks are far more compatible with Dyneema®/Spectra® lines, carbon laminate connection points and webbing than traditional blocks with steel loop tops or shackles.


  • Back-to-back design
  • 1-3/16" (30mm) sheave
  • Maximum line size 5/16" (8mm)
  • Maximum weight load 661 lb. (300 kg)
  • Breaking load 1323 lb. (600 kg)
  • Weight 1.6 oz. (46 g)


  • Mainsheet systems and spinnaker sheets on catamarans and dinghies to 5m (16ft)
  • Halyard, vang and backstay applications on boats to 5m (16ft)
  • Control line applications on larger yachts


  • Sheave: High compression strength carbon black Acetal
  • Ball Bearings: High compression strength Acetal
  • Frame/Cheeks: Toughened, glass fiber-reinforced nylon
  • Link: UV stabilized, multi-strand impregnated SK75 Dyneema®