Disignation:

Ball Н 20.638 - 5 GOST 3722-81
Steel-balls 20.638 mm ISO 3290-1:2014
Steel balls 20.638 mm DIN 5401
Rolling bearings-Balls 20.638MM (13/16") JIS B1501-2009

Design:

Balls for rolling bearings are made from steel according to GOST 801-78 and GOST 4727-67. They are subjected to special thermal treatment and provide hardness HRC 62. Hardness control system GOST 9013-59. Tolerance of average diameter not more than 0,15 mm. Balls are degaussed.

Storage condition:

It is allowed to store balls at the next conditions:
- temperature 20 +/-5С;
- relative moistness not more than 70 percents.