Amazon.com: uxcell Sliding T Slot Nuts, M6 Half Round Roll in T-Nut for 3030 Series Aluminum Extrusion Profile, Carbon Steel Nickel-Plated, Pack of 15 : Industrial & Scientific
F13037Z ROLL IN T-NUT W/ BALL SPRING SA 1/4-20 SLOT 8 ZINC PLATED STEEL
Sliding T-Nut - Maker Store USA
F131100M 30S DROP IN Z-NUT 1/4-20 SLOT 8
13040 | 5/16-18 Self-Aligning Roll-in T-Nut with Ball Spring