When an adjustable ring is reset because of wear, it is no longer round but lobed because of the splits. The lobed condition of the adjustable ring contacts the product threads on a much smaller surface area, reducing wear life. Solid rings remain round throughout their life, allowing for an even distribution of wear. Weight is another factor, as adjustable ring gages have a significant increase in weight to accommodate the adjustment feature. Weight is the biggest factor in thread gage life.
Excessive weight reduces gage life.
Thread gages are rotated on product threads axially one thread at a time until full engagement is completed. This continuous rotation creates the wear. Weight enters the picture as a function of friction. The greater the weight, the greater the friction. Reductions in weight are accomplished through design of the thread gages.