Barton Marine Four-Block Mast Base Organizer

The Barton Marine Four-Block Mast Base Organizer is built for sail-control systems that need a strong, compact change of line direction. Barton Marine's plain-bearing block construction uses molded sheaves and corrosion-resistant internal hardware to keep the line running smoothly under load. Through-bolted and riveted construction adds security at the side plates, while the specified swivel, becket, upright, or stand-up configuration suits the intended rigging layout. The block is sized for cruising and racing applications where dependable load handling matters more than unnecessary complexity.

It accepts up to four double tang blocks mounted on individual stainless steel swivel posts but with three deck fixing points. The unit is fitted close to the mast base to accept halyards, reefing lines, and a topping lift. It is designed to work with Barton Marine's range of deck organizers, rope clutches, and winches, doing away with the need to leave the cockpit when reefing, hoisting, or lowering the mainsail. Accepts multiple turning blocks at the mast base.

• Length: 160mm
• Width: 25mm
• Height: 28mm
• Safe Working Load: 1,540kg
• Break Load: 3,080g

For the Four-Block Mast Base Organizer, match the block to the rope diameter and safe working load specified for the model, and keep the lead aligned with the sheave to avoid unnecessary side load. Swivel, becket, upright, and stand-up versions each solve a different rigging problem, so the attachment style should be chosen around the intended purchase or turning point. For more blocks and line-control components, browse more Sailing Hardware.