Disignation:

Roller 4x12 B III - GOST 25255-82;
Cylindrical roller 4x12 mm ISO/NP 12297-1:2015
Needle roller 4x12 mm DIN 5401:2002-08;
RN-4x12 BF/G2 (SKF marking);
RN-4X12 B та RN-4X12 BF (could be substitued) 

Design:

Rollers are made from steel ШХ15 according to GOST 801-78. They are subjected to special thermal treatment and provide hardness HRC 60. Hardness control system GOST 9013-59. Tolerance of average diameter not more than +10,25 / -16,25 micron. Rollers are degaussed.

Storage condition:

It is allowed to store rollers at the next conditions:
- temperature 20 +/-5С;
- relative moistness not more than 60 percents.