Q. I need a lock ring or retaining ring. How do I specify that?
A. A Lock Ring is a female threaded ring to be inserted between two devices to secure the devices at a certain distance or at a certain angle, while an example of a Retaining Ring is a male threaded ring used to secure a lens within a cell or a filter frame.
To create either part, first select the device or feature the ring will connect to, on the Telescope or the Camera side (the side selected will determine whether the ring is threaded male, a lock ring, or female, a retaining ring), then select extensions and spacers -> Lock Ring on the other side. Noting that the "extensions and spacers" category is located at the end of the pull-down menus on the first page.
For example selecting a generic T-thread on the Telescope Side produces a female threaded lock ring. For an example of a male threaded ring select a generic filter on the Camera Side, and again extensions and spacers -> Lock Ring, but this time on the Telescope Side: note that the part produced is a retaining ring of the type used to hold a glass filter in a filter cell, or for securing a lens in an optical tube. Our Virtual Reality 3-D rendering is best to show details in thin parts such as retaining rings. Zoom the display by scrolling or pinching.
Lock rings and retaining rings are normally made at minimum length (by specifying a length of 0) but can also be made a little thicker to improve grip, particularly on female threaded lock rings.
Most, but not all, types of lock rings can be designed online.
Female threaded lock rings are generally knurled while male retaining rings have spanner slots or holes to facilitate installation and removal.

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