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 LB5774-E is a Ø1" CaF2 bi-convex lens with a focal length of 25.4 mm and an anti-reflection coating for the 2 to 5 µm spectral range, released on February 9, 2010. Having reached its discontinued date on June 4, 2024, this component has been officially succeeded by model LB5774-E1. Submit the exact part number, quantity, and application requirements to request a quote for remaining inventory or the approved replacement.
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 LB5774-E. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.