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2020 Slot-Keyed M3 Grid Adapter Plate
An 84 x 64 x 6 mm adapter plate that bolts to 2020 extrusion with two M5 T-nuts. A 5.6 mm key sits in the 6 mm T-slot so the plate stays square to the rail. It has a 20-hole M3 grid (4.0 mm bores for heat-set inserts, 10 mm pitch), so sensors, boards and brackets with any M3 pattern on that grid can be mounted without drilling the extrusion.
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