234, 234M Series
Rods with spherical
1-24" / 25-600mm
These rods or “standards” are for checking
and setting micrometers of 2" capacity and
larger, and are also used on machine tools
for comparing gages, checking precision
measuring tools, for measuring parallel
surfaces, and many other types of work .
They are made of special tool steel in rod form
with ends hardened and accurately lapped to
a spherical radius .
Available plain or with insulated handles to
minimize expansion by heat when held in
the hand . 1-6" (25-150mm) sizes are 1/4"
(6 .3mm) diameter; 7-11" (175-275mm) sizes,
3/8" (9 .5mm) diameter; 12-24" (300-600mm)
sizes are 7/16" (11mm) diameter .
NOTE: These standards are the ones used
for all micrometers furnished with standards .
Larger sizes available on special order .