These high quality tension check springs will fit for Singer machines models machine mentioned below :

201, 201-2, 221 Featherweight, 222, 223, 237, 239, 240, 241, 242, 247, 247AP, 248, 250, 251, 252, 257, 258, 259, 288, 293B, 301, 337, 338, 348, 401, 416, 500, 502, 503, 507, 509, 513, 514, 518, 522, 527, 533, 534, 538, 543, 600, 603, 604, 620, 620E31, 625, 626, 628, 629, 630, 630E, 635, 636, 638, 639, 640E, 645, 646, 649, 1200-1, 1247, 1280, 1288, 1802, 1803, 1812, 1852, 1862, 1872, 1873, 2404, 2430, 2732, 3101, 3102, 3103, 3105, 4522, 4525, 4526, 4528, 4530, 4538, 4825, 4828, 4830, 6011, 6012, 6021, 6102, 6104, 6105, 6106, 6110, 6120, 6130, 6136, 6146, 6152, 6156, 6174, 6184, 6201, 6202, 6211, 6212, 6214, 6215, 6217, 6221, 6513, 6522, 6528, 6533, 6543, 6544, 6548, 6606, 7025, 7101, 8019, 8502, 8505, 8518, 8602, 8605, 8606, 8610, 8614, 8618, 9900