Technical Data Thread: Metric ISO trapezoidal thread complying with DIN 103 Diameter: 10 – 80mm Lead: 2 – 24mm Number of starts: up to 6 threads Direction of rotation: right-hand thread, single-start also available as lefthand thread Length: up to 3000 mm to Tr 18 x 4 Up to 6000 mm from Tr 20 x 4 Material: 1.0401 (case-hardened steel C15) Low-stress annealed, weldable Precision: 50 – 300 µm/300 mm Straightness: 0.1 – 0.5 mm/300 mm Right-hand/left-hand shaft: for leads of 2 – 10 mm End journal: as customer requirement Manufacturing length 3000mm, available up to 6000mm length in diameters of 20mm and greater. Thomson TrapezoidalScrews Brochure