These are post insertion Tee Nuts that can be added anywhere along the slot of V-Slot or compatible extrusions.
Drop In Tee Nuts - Maker Store USA
Did you forget to add a Tee Nut? Drop In Tee Nuts are here to save you, just add them to any location on a V-Slot or C-Beam Linear Rail. Product
Drop In Tee Nuts Pack - OpenBuilds Part Store
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25 Pieces T-Nut M5 Drop In Tee Nuts V-SLOT Hammer Nut T Nut for
SHOP NOW - Drop In Tee Nuts! Fast Shipping from U.S. - Genuine OpenBuilds Parts - #1 Open Source Hardware
Drop In Tee Nuts Pack - OpenBuilds Part Store
You've spent hours painstakingly assembling your machine from V-Slot extrusion, carefully installing every single nut and bolt. Just when you think
M5 Drop Tee Nut
Drop in T Nuts Hammer Head Carbon Steel for Aluminum Extrusion - WKOOA
80/20 Inc. - Open Shelving Accessories & Components; Component