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Series 20 Orbit Block


Model # 10468502 | Mfg # RF25109
In stock online.

The incredible Series 20 Lashing Orbit Block is capable of loads up to 550lb. (250kg) while weighing a mere 0.3oz. (9 grams). It’s so light that it needs to be lashed down! Excellent choice for control lines on dinghies and catamarans up to 16'.

  • 3/4" (20mm) high-compression-strength carbon Acetal sheave, stainless steel ball bearings and nylon frame/cheeks
  • Integrated stainless steel hub to accept lashing attachment and through-sheave becket
  • Fits up to 5/32" (4mm) lashing
  • Max. line dia. 1/4". Max. working load (MWL) 550lb. Breaking load (BL) 1210lb.
  • Block must be lashed through hub. MWL. & BL are dependent on the strength of lashing. Knots, splices, stitching will generally have a lower BL than the line itself.

Series 20 Orbit Block

Ball Bearings Stainless Steel
Becket No Becket
Diameter 1/4 Inch or 6 mm
Direction Any
Integral Cleat No Integral Cleat
Mount Type Rope/Webbing
Ratchet Non Ratcheting
Safe Working Load 550 Pounds
Sheave Diameter 3/4 Inches or 19 mm
Type Single

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by PowerReviews
Ronstan Series 20 Orbit Block

(based on 1 review)

Ratings Distribution

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Reviewed by 1 customer

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works like a charm

By bjarthur

from ithaca, NY

About Me Casual/ Recreational

Verified Buyer


  • Attractive Design
  • Easy To Install
  • Easy To Use
  • Quality Construction


    Best Uses

    • Sailing
    • Small Boats

    Comments about Ronstan Series 20 Orbit Block:

    includes the lashing, so no need to buy that separately

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