A sailboat rudder head is a metal or composite fitting, often called a rudder box or headstock, that connects the tiller (or steering linkage) to the rudder blade. It sits atop the rudder shaft/blade, allowing for a secure, articulating joint to transmit steering forces, often using a "gudgeon and pintle" system for attachment to the transom.

Key Features and Functions
Purpose: It holds the rudder blade, connects to the tiller for manual steering, and attaches the assembly to the stern.

Components: Frequently includes a U-shaped housing, attachment holes for a tiller bolt, and a "coulisse" or hinge mechanism that enables the rudder blade to kick up, especially on dinghies.

Materials: Typically manufactured from durable materials like cast bronze, stainless steel, aluminum, or robust plastic (often in high-performance or small racing boats).

Types: Available in straight or angled configurations to fit different stern profiles.

Mounting: Features specialized holes or pins (pintles) that mate with gudgeons mounted on the transom.

Rudder heads are crucial for maintaining a responsive connection between the helm and the rudder, especially on smaller boats and performance dinghies.