The Barton Size 1 30mm plain bearing double swivel block with becket (Manufacturer Part No N01231) is a compact steel-framed pulley designed to lead and redirect control lines on small to medium craft. Its primary benefit is a durable lightweight lead for up to 8mm (5/16") rope providing secure handling with minimal bulk.

• 30mm x 12mm sheave suitable for up to 8mm rope
• Internal steel frame for increased strength at 88g weight
• Swivel head plus fixed becket for single-line attachment and easy re-leads
• Rated SWL 355kg with break load 710kg for verifiable strength
• Double sheave supports simple purchase systems and tandem leads

Problem/solution: when deck space and weight matter you need compact hardware that still carries measured loads. This block solves that by combining double plain-bearing sheaves and a becket in a 93 x 40 x 32 mm unit so you can reroute or lead lines without extra fittings.

Compared to ball-bearing variants this plain bearing model is simpler and lower maintenance; Barton also offers ball-bearing sheave options where higher rolling efficiency and higher rolling-load ratings are required. Use this block for halyards, reefing lines, small mainsheet leads, and light purchase systems on dinghies and cruising boats.

Trust signals: built with an internal steel frame by Barton Marine and supplied as part number N01231 with published SWL and break-load figures. Check compatibility with your rope diameter and rigging setup before installation. Discover more or order now.