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Couplings to fit our coupling joint. UCF/2 - 2mm (PSU, EM1 & EM25) UCF/3 - 2.3mm (400 Motor) UCF/31 - 1/8" (500 & 600 Motor) UCF/4 - 4mm UCF/M4 - 4mm threaded : for PSU2 Range. UCF/5 - 5mm (700 Motors) UCF/6 - 6.35mm (800 & 850 Motors) UCF/60- 6mm UCF/J - Joint UCF/D - Doubler