Series 55 Orbit BB Quad Block with Swivel Mount
Mouse Over to Zoom
Click to Enlarge

RONSTANSeries 55 Orbit BB Quad Block with Swivel Mount


In stock online.
Model # 11075413 | Mfg # RF55410UPC # 9316800442669


Series 55 Orbit BB Quad Block with Swivel Mount

Name Value
Becket No Becket
Diameter 3/8 Inch or 10 mm
Direction Any
Integral Cleat No Integral Cleat
Mount Type Swivel Shackle
Ratchet Non Ratcheting
Safe Working Load 1650 Pounds
Sheave Diameter 2 5/32 Inches or 55 mm
Type Quad

Product Overview

Series 40 Ball Bearing Blocks are suitable for sheet applications on dinghies, sportboats and small one-design keelboats, and for control lines on larger boats. They feature a precision two-stage bearing system for better durability, lighter weight and low-friction performance. Models with swivels feature stainless steel shackles.

  • 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


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.

Related West Advisor Articles


Product Q & A