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Shoulder 60T Pulley Hub
This rotating shoulder hub is part of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 52 x 44 x 38.5 mm part with a 60T GT2 pulley at the bottom (tip OD 37.69, 8 mm track between 1 mm thick, 44 mm OD flanges) and a 44 mm bolting flange at the top. It runs on two 608 bearings in 22.05 mm pockets (6.5 mm deep at the bottom, 7.2 mm deep at the top) on the base's 8 mm shoulder rod. The top flange takes four M3 heat-set inserts on a 34 mm PCD for the upper arm. A +X lug holds both ends of the open GT2 belt in 2.2 mm slots, each crossed by a 3.4 mm hole for an M3x16 pin screw.
🧩 Part of the NEMA17 Belt-Drive SCARA Drawing Arm (shoulder joint hub with printed 60T GT2 pulley) kit.
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