Spring-Type Calipers 73, 79, 83 "Yankee" Spring-Type Calipers and Dividers with Fla t Legs and Quick-Spring or Solid Nut 4, 6, 8, 12"/100, 150, 200, 300MM "Yankee" Calipers and Dividers are made from a high-grade steel and well-finished. The legs are made of flat stock and are very durable. The fulcrum stud is hardened and has a smooth bearing surface. The bow spring, although flexible, is exceedingly strong to assure reliability. All sizes are available with either spring nut or solid nut. The Starrett quick-adjusting automatic-closing spring nut is designed for making fast, positive adjustments. The threads of the nut firmly engage the screw at the slightest pressure from the leg. When the pressure is withdrawn, the nut automatically releases itself,sliding freely over the screw.This feature saves time in opening and closing. 274, 275, 277 Toolmakers' Spring-Type Calipers and Dividers with Round Legs and Solid Nut 3, 6"/75, 150MM Toolmakers' Calipers and Dividers are the finest tools of their type. Designed for toolmakers and all good mechanics who require finer adjustment and better balance so a more sensitive "feel" can be obtained. Precision made to rigid Starrett standards throughout. The fulcrum stud is hardened and the bearing surfaces of the legs are large enough to prevent any side deflection. The bow spring is strong and flexible, and the adjustment is centrally located in the legs to assure smooth action. 274, 275, 277 Calipers Quick-adjusting spring nut 274, 275, 277 Toolmakers' Spring-Type Calipers and Dividers* Inside Calipers Outside Calipers Dividers Size and Approx. Capacity Cat. No. EDP Cat. No. EDP Cat. No. EDP in mm 274-3 51301 275-3 51305 277-3 51309 3 75 274-6 51303 275-6 51307 277-6 51311 6 150 *Not available with spring nut 73, 79, 83 Calipers 73 "Yankee" Spring-Type Inside Calipers Solid Nut Quick-Spring Nut Size and Approx. Capacity Cat. No. EDP Cat. No. EDP in mm 73A-4 50334 73B-4 50335 4 100 73A-6 50336 73B-6 50337 6 150 73A-8 50338 73B-8 50339 8 200 73A-12 50342 73B-12 50343 12 300 79 "Yankee" Spring-Type Outside Calipers Solid Nut Quick-Spring Nut Size and Approx. Capacity Cat. No. EDP Cat. No. EDP in mm 79A-4 50364 79B-4 50365 4 100 79A-6 50366 79B-6 50367 6 150 79A-8 50368 79B-8 50369 8 200 79A-12 50372 79B-12 50373 12 300 83 "Yankee" Spring-Type Dividers Solid Nut Quick-Spring Nut Size and Approx. Capacity Cat. No. EDP Cat. No. EDP in mm 83A-4 50376 83B-4 50377 4 100 83A-6 50378 83B-6 50379 6 150 83A-8 50380 83B-8 50381 8 200 83A-12 50384 83B-12 50385 12 300 312 C alipers , D ividers and T rammels