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 354340-AB is an unmounted aspheric lens featuring a focal length of 4.0 mm, a numerical aperture of 0.64, and a working distance of 1.5 mm. This optical component includes an antireflective coating specified for the 400 to 1100 nm wavelength range and weighs 0.04 lbs per unit, with lifecycle status subject to current manufacturer documentation following its April 7, 2026 release date. Submit the exact part number, quantity, and application requirements to request a quote.
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 354340-AB. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.