Quick answer
Include the complete designation, quantity, dimensions, application and delivery destination. Add precision, clearance or preload, sealing and documentation requirements where relevant. Identify unknown values rather than selecting arbitrary options.
Identify the product
Provide a complete model with suffix, a drawing or a clear photograph. State whether an exact replacement or an engineering alternative is required.
Describe the application
Include loads, speed, temperature, lubrication and mounting. For matched sets, specify arrangement, precision and preload.
Set commercial requirements
List quantity, destination, requested schedule, packing and documents. Availability, price and delivery require supplier confirmation.
Selection depends on the full designation, operating conditions and confirmed manufacturer data. Use this guide to prepare your requirements.