Barton Marine Size 3 Double Plain-Bearing Upright Block

The Barton Marine Size 3 Double Plain-Bearing Upright Block 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.

Suitable for use as mainsheet, vangs, lead blocks, or wherever a powerful and compact purchase system is required on dinghies, dayboats, and lightweight cruisers. Suitable for up to 10mm (3/8") rope. Plain-bearing design keeps the sheave arrangement simple. Through-bolted construction adds strength at the side plates.

• Plain-bearing design keeps the sheave arrangement simple
• Through-bolted construction adds strength at the side plates
• Corrosion-resistant internal hardware suits marine rigging
• Configuration is matched to the attachment style in the model name

For the Size 3 Double Plain-Bearing Upright Block, 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.