Welcome to the Prater STEP Library

Click any item below to download A ZIP file of all available STEP files for that product category.



Fine Grinders


Air Classifying Mills





Air Classifiers



Vibratory Screens



Mega Mills





Rotary Sifters



STEP (CAD) Files Disclaimer

The 3-D CAD models and related information are provided for reference only. The CAD models do not contain any technical information other than what is readily observable, specified by industry standards or provided to us by our suppliers, and they are subject to change without notice. The dimensions and other technical specifications of our products may vary from those shown in the CAD models, due among other reasons to tolerances associated with manufacturing processes. Manufacturing tolerance information is considered proprietary by many of our suppliers and is not always provided to us. Thus tolerance information may not be reflected in the CAD models. Your use of the CAD models is at your own risk and you are solely responsible for any use you make or permit others to make of the CAD models. McMaster-Carr makes no representation or warranty (express or implied) with respect to the CAD models, including but not limited to the accuracy or completeness of product dimensions or any other technical specifications contained in or accompanying the CAD models, non-infringement of third party rights, and quality, suitability, fitness for purpose or title. McMaster-Carr may terminate or limit your access to the CAD models for any reason at any time.

The CAD models are being made available to help you decide whether to purchase products from us. You may download the CAD models and share them with others in your organization or with third parties acting on behalf of or rendering services to you or your organization (including your data center or cloud service providers), but only for purposes of deciding whether to purchase products from us or in order to develop design drawings and prototypes for use by you or your organization in connection with a decision regarding whether to purchase products from us. You shall not use a CAD model to engage in 3D printing or other fabrication of the object depicted in the CAD model for any other purpose. You shall not otherwise redistribute or make available the CAD models (or any design drawings or prototypes that incorporate them) to any third parties, including third parties in the business of selling products similar to the products sold by us.