3/32-100 Bobbin Case Tension Spring Screw, large, for Singer Industrial Sewing Machine Classes: 16, 17, 31, 44, 68, 69, 71, 78, 95, 96, 114, 195K, 196K, 241, 245, 251, 269W, 270, 271, 281, 291U, 331K, 366K, 369W, 391U, 400W, 402W, 410W, 451K, 491D, 600W & 770 ; Consew Classes: 18, 28, 30 & 118.