73A-4 Starrett (4* / 100mm) Yankee Spring-Type Inside Caliper

73A-4 Starrett (4* 100mm) Yankee Spring-Type Inside Caliper with Solid Nut and Flat Legs
Starrett “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withdrawn, the nut automatically releases itself, sliding freely over the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.