Trapezoidal lead screws and nuts are power transmission screw threads similar to the Acme series but made to metric dimensions and standards. One such standard is the German Metrisches ISO-Trapezgewinde DIN 103 which has been adopted by the International Organization for Standards (ISO). Sometimes misnamed metric Acme or metric M series Acme Trapezoidal lead screws look like Acme screws and have the same stout thread form and the same robust and durable features as the Acme series Product Name:3d printer trapezoidal stainless steel screw brass nut lead screw Diameter:2mm-80mm or non-standard as request&design Length:The longest 3000mm or non-standard as request&design Screw Pitch(Lead):Up to 50mm Accuracy:C5,C7 and C10 Material:Bearing steel Preload:P0 or P1 Certificate:ISO 9001:2008 Application:Steel Industry, Mining&Construction, Paper making Machinery,vibrating screens, shakers, conveyors, 3D printer. Feature:high precision, high speed, long life, high reliability, low noise Guarantee period:12 months guarantee from your purchase date. Packing:vacuum plastic bag + carton box, or as per your requirements