Tension Disc for Singer Industrial Sewing Machine Classes: 16, 17, 18, 20, 24, 29K, 31, 44,  68, 69, 71, 78, 81, 95, 96, 114, 118, Centurion 121,132K, 133K, 138, 144W, 145W, 147, 188, 195K, 196K, 231, 240, 246, 252, 253, 261, 262, 269W, 270, 271K, 281, 300, 302, 320W, 331K, 369W, 400W, 402W, 410W, 451K, 460, 600W, 990, 991, 992, 993, 997, 998 ; Consew Classes: 28 & 30.