Skip to content Skip to navigation menu

Series 40 Orbit BB Cheek Block


Add to My List
In stock online.
Model # 9553074 | Mfg # RF45151

Ronstan’s Orbit Blocks are ideal for sheet applications on dinghies up to 16' and control line applications for small keel boats. These blocks feature a precision, two-stage bearing for reduced friction under high loads. 

  • Sheave: Carbon fiber reinforced, PTFE impregnated engineered nylon
  • Ball bearings: High compression strength carbon black acetal; stage-2 bearing: glass fiber reinforced, MoS2 impregnated engineered nylon
  • Cheek material/finish: Toughened glass fiber reinforced nylon

Series 40 Orbit BB Cheek Block

Becket No Becket
Diameter 5/16 Inch or 8 mm
Direction Any
Integral Cleat No Integral Cleat
Mount Type Mechanical Fasteners
Ratchet Non Ratcheting
Safe Working Load 715 Pounds
Sheave Diameter 1 9/16 Inches or 40 mm
Type Single Cheek/Foot
Weight 1.1 Ounces

West Advisor

The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.