Mast Extension U-Pin Carbon SDM 48cm XO Sails AR00959

Mast Extension U-Pin Carbon SDM 48cm XO Sails AR00959

Description:

This U-Pin SDM mast extension is a high-performance tuning accessory for windsurfing, providing precise sail downhaul and outhaul adjustment. Constructed from prepreg carbon, the extension delivers exceptional stiffness and strength while keeping overall weight low for improved responsiveness. An integrated Dyneema line and a high-strength cast iron pulley ensure smooth, low-stretch control and reliable operation under load. The U-pin locking system offers secure, quick connection to SDM (standard diameter) masts and most U-pin compatible booms and sails. Finished in sleek black, the extension combines race-ready performance with durable hardware built to withstand demanding conditions on the water. Its very rigid and resistant construction helps maintain consistent sail shape and power transfer, giving riders better control in strong winds and dynamic maneuvers.

Key Features:

• Prepreg carbon construction for high stiffness-to-weight ratio and long-lasting durability
• Designed for SDM (Standard Diameter Mast) compatibility with U-pin locking system
• 48 cm length for extended downhaul range and fine sail tuning
• Dyneema (Dynema) control line: low stretch, high abrasion resistance
• High-strength cast iron pulley for smooth, reliable operation under load
• Sleek black finish for a refined, low-profile look
• Very rigid, impact-resistant design built to handle demanding windsurfing conditions
• Quick and secure adjustment for faster rigging and precise sail trim

Specifications:

Manufacturer: XO Sails
SKU: AR00959
Material: Prepreg carbon body; Dyneema control line; high-strength cast iron pulley/hardware
Size/Dimensions: 48 cm (mast extension length)
Weight: Not specified by manufacturer
Color: Black
Category: Mast Extensions
Age Group: Adults
Gender: Unisex

Recommended Use:

Ideal for intermediate to advanced and professional windsurfers who need precise sail tuning and reliable, stiff extensions for performance sailing. Best suited to freeride, slalom, and racing conditions where responsive sail control and low-stretch hardware improve power transfer and handling. Performs well in challenging, high-wind environments; pair with an SDM mast, compatible boom and U-pin-equipped sail for optimal fit and function. Consider using protective mast socks and regular rinsing after use to prolong hardware life.