LLC Instrument
Our factory specializes, basically, on release of technical, clock and instrument stones. Such as pyroceram, corund foot bearings, ruby, ceramic bushings, and also corund nozzle and another.

Watch spherical superimposed stone. ТУ 25-1895.0016-91

Черчеж Фото. Вид под микроскопом.

It composes part of a bearing of regulating wheel finder in chuck of a stone with hole.
The chucks provide flexible shock-resistance of watch mechanism.
Material: Ruby-5

By the order of the consumer cap jewels 2Н with the maximum height deviation Н up to a minus 0,02mm are made for the clocks with shock-proof and oil-retaining devices.

Stone
typesize
D mm H mm
nominal tolerance nominal tolerance
H 1018 1,0 -0,010 0,18 -0,030
H 1022 1,0 -0,010 0,22 -0,030
H 1025 1,0 -0,010 0,25 -0,030
H 1118 1,1 -0,010 0,18 -0,030
H 1225 1,2 -0,010 0,25 -0,030
H 1230 1,2 -0,010 0,30 -0,030
H 1240 1,2 -0,010 0,40 -0,060
H 1630 1,6 -0,010 0,30 -0,030
H 1645 1,6 -0,010 0,45 -0,060
H 2050 2,0 -0,014 0,50 -0,060
H 3080 3,0 -0,014 0,80 -0,060
2H 1018 1,0 -0,010 0,18 -0,02
2H 1225 1,2 -0,010 0,25 -0,02