Harken 38mm Single Big Bullet Block

The Harken 38mm Single Big Bullet Block is a low-friction marine pulley system engineered for efficient line management and control in demanding rigging applications. Built to handle the demands of offshore work, sailing operations, and heavy-load scenarios, this single block combines compact design with proven working load capacity, making it a core component for anyone managing control lines under sustained pressure.

Designed with a 38mm (1.5-inch) sheave diameter, the block accommodates line up to 10mm (3/8-inch) diameter and carries a maximum working load of 136 kg (300 lbs). The engineering prioritizes low-friction rotation to enable fast trimming and responsive load release across both high and low tension conditions. Its lightweight footprint and compact profile reduce weight aloft while maintaining structural integrity, critical specifications for rigging systems where every pound counts. The Big Bullet design adapts across multiple control line applications—from mainsail systems to boom control and auxiliary halyards—without requiring specialized mounting hardware.

This block is suited for serious sailors, marine operators, and rigging crews who rely on precise line control under load. Whether managing sail trim during offshore passages, coordinating deck operations, or deploying recovery systems, users benefit from the block's consistent performance across variable sea states and load conditions. The range of Harken single block styles means this model integrates seamlessly into existing control line architectures without requiring system redesign.

Harken's reputation for marine hardware reliability stems from precision manufacturing and field-proven durability across commercial, military, and recreational sailing fleets. The 38mm Big Bullet Block represents the standard engineering approach—meeting load specifications while minimizing weight and maintenance demands.