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End Caps and Plugs![]()
SM1CP2M Externally SM1-Threaded SM1EC2B Snap-On Cap for CMCP1 Internally C-Mount-Threaded End Cap SM2PL Externally SM05CP2 Externally SM05-Threaded End Cap RMSCP1 Internally RMS-Threaded D1NEC2 D1N Dovetail Cover ![]() Please Wait ![]() Click to Enlarge SM1EC2B Lens Tube Cap Seals Off the End of a Ø1" Lens Tube Thorlabs offers a selection of anodized aluminum SM-threaded end caps and plugs for use with Ø1/2", Ø1", Ø2", and Ø3" lens tubes. We also offer plastic snap-on caps for Ø1" and Ø2" lens tubes, as well as a plastic cover for D1N dovetails. Additionally, there are anodized aluminum caps for use with C-mount and RMS threaded components available. The end caps are useful for sealing off the end of imaging components for protecting the optics during transport or storage. The plugs can be threaded deep into a lens tube to produce a seal closer to the optic and feature two dimples that accept our spanner wrenches. The D1N cover protects against unwanted light and dust. Additionally, a selection of these caps and plugs are marked at their center with a dimple to facilitate custom-sized bores centered on the optical axis of the lens tube, making them useful for machining custom inserts. Thorlabs' Threading SpecificationsThorlabs' 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.
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The SM05CP1 and SM05CP2 are black-anodized aluminum end caps used to seal off a Ø1/2" lens tube. The SM05CP1 has internal SM05 (0.535"-40) threads to seal the end of an externally SM05-threaded lens tube, while the SM05CP2 has external SM05 threads to seal the end of an internally SM05-threaded lens tube. Both caps have a knurled edge to allow them to be securely hand tightened. The SM05PL lens tube plug has external SM05 (0.535"-40) threads along its entire length and is designed to seal off our Ø1/2" lens tubes. It can be threaded into an SM05 lens tube using an SPW801 spanner wrench that can be adjusted so that the tips of the prongs on the SPW801 fit into the two shallow holes, each of which is located 0.20" from the center dimple. The center dimple of the SM05PL allows it to be customized in a machine shop with excellent centration. The SM05A7 alignment disk provides useful aids for aligning visible beams to the center of optical mounts. To enable accurate alignment, the disk has clear markings with graduations on both the X and Y axes. The back of the alingment disk features our standard SM05 (0.535"-40) threading for compatibility with Ø1/2" lens tubes and fixed optic mounts. ![]() ![]() Click to Enlarge RMSCP2 Protecting Turret Ports ![]() Click to Enlarge RMSCP1 Covering an Objective
These RMS-Threaded Caps are designed to protect microscope objectives lenses, objective lens ports, and other RMS (0.800"-36) threaded components. The RMSCP1 features internal RMS threading, which enables them to be used with standard RMS-threaded microscope objectives. The RMSCP2 features external RMS threading to cover unused objective lens ports (see image on the far right). Each of these caps is made from anodized aluminum and has a knurled edge for secure hand tightening. ![]()
These C-Mount Caps are designed to be used with our CCD/CMOS cameras, C-mount extension tubes, camera lenses, and other C-mount-threaded (1.00" -32) components. The CMCP1 features internal C-mount threading while the CMCP2 features external C-mount threading. Each of these caps is made from black-anodized aluminum and has a knurled edge for secure hand tightening. To use one of these caps with a C-mount-threaded CCD or CMOS camera, please choose the externally threaded CMCP2 cap. ![]()
The SM1CP1 and SM1CP2 are black-anodized aluminum end caps used to seal off a Ø1" lens tube. The SM1CP1 has internal SM1 (1.035"-40) threads to seal the end of an externally SM1-threaded lens tube, while the SM1CP2 has external SM1 threads to seal the end of an internally SM1-threaded lens tube. Both caps have a knurled edge to allow them to be securely hand tightened. The SM1CP2 features engraved crosshairs on one side that can be used for quick coarse alignment. For applications that require more precise alignment, please see our full selection of alignment tools. The SM1CP2M is an end cap with external SM1 threading and a knurled lip, while the SM1PL is a plug (no lip) with external SM1 threading. The SM1PL plug can be threaded into an SM1 lens tube using an SPW801 or SPW909 spanner wrench, both of which will fit into the two shallow holes located 10 mm from the center. The SM1CP2M and SM1PL both have a center drilled dimple located on the optical axis to allow them to be customized in a machine shop with excellent centration. The SM1A7 alignment disk provides useful aids for aligning visible beams to the center of optical mounts. To enable accurate alignment, the disk has clear markings with graduations on both the X and Y axes. The back of the SM1A7 has SM1 (1.035"-40) threading for compatibility with Ø1" lens tubes and fixed optic mounts. ![]() ![]() Click to Enlarge Back View of SM1EC2B Snap-On End Cap
The SM1EC2B plastic dust cap snaps onto internally SM1-threaded (1.035"-40) components, such as 30 mm cage plates and cubes or the internally threaded end of a Ø1" lens tube (see photo in the Overview tab). By sealing off the end of a lens tube or cage cube, this cap helps to protect optics against dust and debris while not in active use. The SM1EC2B cap has an outer diameter of 1.20" (30.5 mm). It is not compatible with C-mount threads. The lens cap is placed on the lens tube by squeezing the protruding edge of the cap, inserting the back of the cap into the lens tube, and then releasing the cap. To avoid deforming the cap, be sure to squeeze the protruding edge when removing it. Avoid using these caps in high heat environments as the cap can deform; use at temperatures between 0 °C to 40 °C for best results. ![]()
The SM2CP1 and SM2CP2 are black-anodized aluminum end caps that allow a Ø2" lens tube to be sealed off. The SM2CP1 has internal SM2 (2.035"-40) threads to seal the end of an externally SM2-threaded lens tube, while the SM2CP2 has external SM2 threads to seal the end of an internally SM2-threaded lens tube. Both caps have a knurled edge to allow them to be securely hand tightened. The SM2PL is a blank plug with external SM2 threading. It can be threaded into a lens tube using an SPW801 spanner wrench that can be adjusted so that the tips of the prongs on the SPW801 fit into the two shallow holes machined near the edge of the plug. The center of the SM2PL plug is dimpled to allow it to be customized in a machine shop with excellent centration. ![]() ![]() Click to Enlarge Back View of SM2EC2 Snap-On End Cap
The SM2EC2 plastic dust cap snaps onto internally SM2-threaded (2.035"-40) components, such as 60 mm cage plates and cubes or the internally threaded end of a Ø2" lens tube. By sealing off the end of a lens tube or cage cube, this cap helps to protect optics against dust and debris while not in active use. The SM2EC2 cap has an outer diameter of 2.20" (55.8 mm). The lens cap is placed on the lens tube by squeezing the protruding edges of the cap, inserting the back of the cap into the lens tube, and then releasing the cap. To avoid deforming the cap, be sure to squeeze the protruding edge when removing it. Avoid using these caps in high heat environments as the cap can deform; use at temperatures between 0 °C to 40 °C for best results. ![]() ![]() Click to Enlarge Back View of D1NEC2 D1N Dovetail Cover ![]() Click to Enlarge The D1N Dovetail Cover on the CSD1002 Double Camera Port
The D1NEC2 plastic cover is ideal for covering unused ports in order to prevent unwanted light and dust from damaging or disrupting an imaging system. It is compatible with any component that has a D1N female dovetail, such as our epi-illuminator modules, single-channel confocal systems, and double camera ports. It can also be used to cover the trinocular port on a Nikon Eclipse Upright or Ti Microscope (click the links to view a diagram of each system with labeled ports). The cap has an outer diameter of 2.85" (72.4 mm), is made from ABS plastic, and features a finger grip on the top for easy handling. ![]() ![]() Click to Enlarge Each SM3 end cap is engraved with its part number and a centered crosshairs for alignment.
The SM3CP1 and SM3CP2 are black-anodized aluminum end caps that allow SM3-threaded (3.035"-40) lens tubes to be sealed off. The SM3CP1 has internal SM3 (3.035"-40) threads to seal the end of an externally SM3-threaded lens tube, while the SM3CP2 has external SM3 threads to seal the end of an internally SM3-threaded lens tube. Both caps have a knurled edge which allows them to be securely hand tightened. Each cap also features engraved crosshairs on one side that can be used for quick coarse alignment, as shown in the image to the right. For applications that require more precise alignment, please see our full selection of alignment tools. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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