1.Product Overview The BLR4040-3.6UU is a THK rotary (spinning) ball screw nut with a 40 mm screw diameter, a 40 mm lead, and double rubber seals (UU) . It combines a ball nut and a support bearing into a single compact unit designed for smooth, high-speed, and high-rigidity linear motion. 👉 Get a quote within 24 hours for your project 2.Technical Specifications Model: BLR4040-3.6UU Shaft Diameter (ID): 40 mm Lead (H): 40 mm Ball center to center diameter: 41.75 mm Structure: