A spool cap is the piece that attaches to the spool pin, that holds the thread in place and helps the thread properly unwind and not jump around while you're sewing.

Guaranteed to fit Singer Sewing Machine Models:
1482, 1485, 1486, 1488, 1490, 1492, 2010 Touchtronic, 2102, 2105, 2106, 2108, 2110, 2112, 2114, 2118, 2210, 2440, 2502, 2503, 2504, 2505, 2515, 2517, 2530, 2543, 2712, 2718, 2722, 2724, 2730, 2732, 2808, 2868, 2950, 30920, 3270, 3317, 343, 4205, 4206, 4210, 4212, 4220, 4228, 4325, 4325C, 4500, 4552, 4562, 4572, 4600, 4613, 4617, 4620, 4623, 4624, 4832, 5040, 5050, 5160, 5417, 5417C, 5430, 5705, 5710, 5800, 5802, 5805, 5806, 5808, 5810, 5812, 5814, 5816, 5817, 5818, 5820, 5825, 5830, 5838, 5910, 5932, 628, 6200, 6210, 6211, 6212, 6214, 6215, 6217, 6218, 6230, 6233, 6234, 6235, 6408, 6412, 6416, 6423, 6606, 6620, 6630, 7000, 7004, 7005, 7025, 7028, 7029, 7033, 7035, 7043, 7200, 7211, 7212, 8220, 9000 Series, 9005, 9008, 9010, 9015, 9018, 9020, 9022, 9030, 9032, 9044, 9124, 9134, 9136, 9200, 9217, 9323, 9334, 9400, 9410, 9417, 9420, 9430, 9444, 9803, 9805, 9806, 9808, 9810, 9812, 9816, 9818, 9824, 9828, 9832, 9836, 9900 Series, 57815, 57817, 57820, 57825, 93220, CG500, CG550, CG590, CM17, CP17, DL17, DX14, FM17, FM22, HD102, HD105, HD110, SM14

Alternate Part Numbers: 507664-469, 179967451, 179967-464, 137192-451, 179967-456, 179967-461, 179967461, 163148-001, 163148001