![]() Two vacuum-compatible options are available and intended for use with threaded components of the same material: unanodized aluminum retaining rings for aluminum vacuum-compatible components and stainless steel retaining rings are ideal for use with our SM-threaded high-stability Polaris mirror mounts. Please keep in mind that due to the increased thickness of the stress-free and plastic retaining rings, the thickness of the optic that can be accommodated in the mount may be reduced. The SM05PRR and SM1PRR Plastic Retaining Rings are produced from Delrin to provide gentler contact with an optic's surfaces than our standard retaining rings. Our Stress-Free Retaining Rings (Item #'s SM05LTRR, SM1LTRR, and SM2LTRR) have a rubber O-ring that provides a light-tight seal around the optical components. We offer extra-thick (5 mm) retaining rings which provide easier mounting for high-curvature lenses, such as aspheric lenses and condenser lenses (see the Lens Mounting Guide tab for more information). For a table of available options, please see the Retaining Rings Selection Guide to the right. ![]() Two retaining rings can be used to secure the optical component inside the center of a lens tube: one as a stopper and the other to lock in the component.ĭepending on the size needed, these retaining rings are available in one or more of the following types: standard balck anodized aluminum, unanodized aluminum, extra-thick, stress-free, plastic, or stainless steel. Thorlabs offers a wide selection of Retaining Rings for securing optical components into our threaded mounts, lens tubes, and unmounted optic adapters. Standard SM05-, SM1-, and SM2-Threaded Retaining Rings Available in Packs of 5 or 10.Stainless Steel SM05-, SM1-, and SM2-Threaded Retaining Rings for Our SM-Threaded Polaris ® Mounts.Unanodized Aluminum SM05-, SM1-, and SM2-Threaded Retaining Rings for Our Aluminum Vacuum-Compatible Components.Delrin ®* (Plastic) SM05- and SM1-Threaded Retaining Rings Provide Gentler Contact with Optic Surface.Stress-Free Retaining Rings are Compatible with the SM05, SM1, and SM2 Thread Standards.Extra-Thick SM05-, SM1-, and SM2-Threaded Retaining Rings for High-Curvature Lenses.Standard (Aluminum) Retaining Rings Available for Optics Ranging from Ø5 mm to Ø4".Use the links in the table header to jump to a detailed web presentation with complete information for each retaining ring. Click "More" in each section of the table to view available retaining rings.Stainless Steel Retaining Rings, Vacuum Compatible Unanozided Aluminum Retaining Rings, Vacuum Compatible Standard Retaining Rings: Ø30 mm to Ø1.5" Retaining Rings Selection Guide a Standard Retaining Rings: Ø5 mm to Ø1/2"
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