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Ø1" Lens Tubes
Internal and External Threads
Internal and External Threads
Internal Threads, Optic Retention Lip
Slotted Lens Tube
Easily Interfaces with Other Lens
Lens tubes are ideal for creating compact optical subassemblies with light-tight beam paths. The Ø1" lens tubes sold here can be used to house one or several optical elements, as shown in the diagram of a beam expander below. In addition to the Ø1" lens tubes featured on this page, Thorlabs also offers Ø1/2", Ø30 mm, Ø1.5", Ø2", and Ø3" versions, each of which is equipped with an SM series thread standard that depends on the tube diameter. Vacuum-compatible versions of our Ø1/2" and Ø1" stackable lens tubes are available from stock; customers can request vacuum-compatible lens tubes at other lengths and diameters by contacting Tech Support.
Optics are separated and secured by retaining rings that are positioned along the length of the lens tube using a compatible SM1 spanner wrench, sold below. Each of the lens tubes on this page come with one or two compatible SM-threaded retaining rings with the exception of the internally unthreaded lens tube spacers (Item #'s beginning with SM1M). In addition, Thorlabs offers stress-free and plastic retaining rings for optics which require reduced stress on our Retaining Rings page.
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When an engraved lens tube is attached to another lens tube, the engraving of the connected end is no longer visible.
Thorlabs' Threading Specifications
Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.
These stackable Ø1" lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM1-threaded (1.035"-40) components provide flexibility for complex optomechanical assemblies. One SM1RR Retaining Ring is included with each lens tube.
For convenience, four of our most popular SM1 lens tube sizes are also available in packs of 5. Each pack of 5 includes one retaining ring per lens tube for a total of five rings.
These stackable Ø1" lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM1-threaded (1.035"-40) components provide flexibility for complex optomechanical assemblies. Made from 6061-T6 aluminum, these lens tubes are vacuum compatible down to 10-6 Torr. One SM1RRV Vacuum-Compatible Retaining Ring is included with each lens tube.
These vacuum-compatible lens tubes feature venting channels along the internal threading and at the ends of each tube. These channels allow air trapped between mounted optics an easy means of escape during pumpdown.
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Vents along the threading and at the ends of these tubes provide a free path for air to escape when under vacuum.
Unlike our Ø1" stackable lens tubes featured above, these internally threaded lens tubes do not feature a lip at one end nor do they have external SM1 threading. Therefore, optics housed inside can be accessed from both ends. To join these lens tubes end-to-end, use a Lens Tube Coupler. Two SM1RR Retaining Rings are included with each lens tube.
These lens tubes feature internal SM1 threading on one end and a retaining lip for holding optics on the other. They allow optics to be quickly added to any externally SM1-threaded components. The SM1L05E is 1/2" (12.7 mm) long and can hold optics up to 0.3" (8 mm) thick, while the SM1L10E is 1" (25.4 mm) long and can hold optics up to 0.8" (20 mm) thick. Each segment includes an SM1RR retaining ring for securing the optic into place. The retaining ring provides a clear aperture of Ø0.90" (Ø22.9 mm) through the lens tube.
These lens tubes are engraved with their respective part number at the end, as shown in the image to the left. This engraving is hidden when the lens tubes are combined with other SM1-threaded components.
These Lens Tube Spacers are designed to connect two components with internal SM1 threads at a fixed distance. They are internally unthreaded and have a clear aperture of Ø0.95" (Ø24.0 mm).
Please note that due to the fixed thread depth of 0.12" (3.0 mm), the orientation of the attached components will be arbitrary. For full control over the component orientation, Thorlabs offers Lens Tube Couplers with adjustable locking rings.
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The dust cover can be opened or closed by rotating it in either direction.
These stackable Ø1" lens tubes with side slots provide a fast and easy means for building complex optical assemblies and adjusting the optics without disassembling the setup. Optics can be inserted into the tube and locked into position using the included SM1RR retaining rings. Simply thread the first retaining ring to the desired depth, add the optic, and then use a second retaining ring to secure the optic. Optics can be manually adjusted via the side slots without the use of a spanner wrench. The included rotatable slip shield, with an inner diameter of 1.21" (31.0 mm), fits over the lens tube slots to prevent unwanted light from entering the system and to keep the optical setup free from debris.
The SM1E60 6" Long Extension Tube is designed to enable longer distances between optical components in lens tube systems that utilize lenses with large focal lengths. This tube features thicker walls than our standard lens tubes while maintaining the same outer diameter, which leads to greater rigidity.
Click to Assemble
Spanner Wrench Usage
Thorlabs offers six different kinds of SM1 (1.035"-40) retaining rings. The SM1RR is our standard aluminum retaining ring that ships with our black anodized Ø1" lens tubes as well as many other Thorlabs components and is available individually or in packs of 10. The SM1RRV unanodized aluminum retaining ring, a vacuum-compatible version of the SM1RR retaining ring, is suitable for use in vacuum pressures down to 10-6 Torr. It is included with our vacuum-compatible Ø1" lens tubes.
Additionally, SM1RR Retaining Rings can be swapped out for one of the SM1-threaded retaining rings listed in the table to the right. Please keep in mind that due to the increased thickness of some retaining rings, the maximum optic thickness that can be housed inside our standard SM1-compatible mounts will be diminished in some cases.
Thorlabs also offers several spanner wrench choices. The 1" long SPW606 and the 3.87" long SPW602 can be used with the SM1RR and SM1LTRR retaining rings, while the adjustable SPW801 can be used with all three types of SM1 retaining rings. These spanner wrenches can be inserted into the lens tube, as shown to the right, and are hollow to prevent obstruction of the beam path. We also offer the SPB1 Spanner Bit, which can be used with a standard 1/4" hex driver (sold separately). The SPB1 is included as part of the SPB600 Spanner Wrench Bit Kit.