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5-to-8 mm Set-Screw Shaft Coupler
A 20 mm OD x 34 mm rigid coupler joining a 5 mm NEMA 17 motor shaft (5.2 mm bore) to an 8 mm rod or T8 leadscrew (8.2 mm bore). A 3 mm internal wall stops both shafts, and each end is clamped by an M3 set screw threaded into a captured M3 hex nut.
5 mm D-Shaft To 1/2 in Hex Coupler
A rigid coupler that joins a 5 mm motor shaft (NEMA 17 D-shaft or a flatted gearmotor output) to a 1/2 in (12.7 mm) hex axle. Each side has two captured M3 nut set screws, so it works with any flat depth. It's 26 mm OD and 44 mm tall, with a 20 mm deep 12.9 mm across-flats hex socket and a 5.2 mm bore. You can drive FRC/VEXpro-style hex wheels and gears from a hobby motor without buying a metal adapter.