Confirm the exact configuration
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

Thorlabs
The Thorlabs BE04R is a 4X reflective optical beam expander designed to operate across a wavelength range of 450 nm to 20 µm and is equipped with an 8-32 mounting plate. Released on October 14, 2009, this component has a package weight of 0.93 lbs. Submit the exact part number, quantity, and application requirements to receive a formal quotation for this Thorlabs part.
Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Thorlabs references — within one business day.
For a faster response, include quantity, condition, and delivery destination.
Verified configuration
Engineering context
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.
Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.
Our sourcing response is prepared against Thorlabs BE04R. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.