1.Product Overview The THK BTK1808V-3.6ZZ is a rolled ball screw single nut manufactured by THK. It features a 18 mm shaft outer diameter, a 8 mm lead, a compact return-pipe design with a round outer flange (flat on two sides), and integrated ZZ brush seals for contamination 👉 Get a quote within 24 hours for your project 2.Technical Specifications Model: BTK1808V-3.6ZZ Shaft Diameter (ID): 18 mm Lead (H): 8 mm Circuit Configuration: 1 row x 3.6 turns (3.6 load circuits)