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NEMA 17 Peristaltic Pump Head
A two-piece peristaltic pump head that bolts straight to a NEMA 17 stepper (31 mm square M3 pattern, M3x12 counterbored screws) and runs 4 mm OD / 2 mm ID silicone tube for dosing, aquarium top-off or coolant. Ø53 x 22 mm; the three-roller rotor prints captive inside the housing's conical throat, clamps to the 5 mm shaft with an M3 grub screw, and takes three 625 bearings (16 x 5 x 5 mm) press-fit on the 4.9 mm posts — the 1.6 mm gap to the race wall fully occludes the tube.
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