Hi Megan,
As the acting C2C Care community monitor, I'd like to thank you for posting this question to the community, and congratulation on the collections storage upgrade! I've attached a link to CCI's Storage and Display Guidelines for Paintings, which recommends the use of appropriate weighted D-rings, S,C,L and eye-hooks for attaching frames to racking screen, and cleats for extra heavy items. I'm also providing a link to a selection of zinc-plated steel and aluminum metal cleats, however, their weight capacity isn't specified. Whichever method you choose, make sure the weight limit of each component is not being exceeded.
Although the C2C Care program does not endorse any particular manufacturer or product, members are welcome to share information on suppliers in addition to their suggestions.
https://www.canada.ca/en/conservation-institute/services/conservation-preservation-publications/canadian-conservation-institute-notes/storage-display-guidelines-paintings.html
https://www.mcmaster.com/products/french-cleats/ - they also have selections of S-hooks, Screw hooks, and tie-down rings with weight ratings.
Happy organizing!
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Sharon Fickeissen
Connecting to Collections Care Monitor
Senior Library Conservation Technician
Hagley Museum & Library
Wilmington DE
sfickeissen@hagley.org------------------------------