2 PCS BELT SHAFT (Top vertical) gear 446021 for SINGER sewing machine models:

241, 242, 247, 248, 249, 252, 257, 258, 259, 263, 267, 288, 300, 353, 354, 360, 362, 367, 368, 547, 563, 588, 1200, 1263, 1280, 2404, 31000 series: 3101, 3102, 3103, 3105, 3130, 3140, 6021, some 6100 series: 6174, 7100 series: 7100, 7101, 7102, 7104, 7105, 7106, 7108, 7110, 7136, 7171, 7174, 8100 (some of these series did not use this gear they use timing belt #423107-001. This gear has a set screw, not for models which use a pin (pin type gear no longer available, #37231),  964, 966, 968, 972, 974

Matching upper horizontal gear #319695