hardness

Class 8.8 bolts are one of the most common structure of hex bolts in the market. they provide acceptable rate of strength and hardness si...

NSK thrust roller bearing رولبرینگ کف گرد that is produced following Japanese industrial standard is a very strong type of roller bearing...

SKF roller bearings are produced in different shapes of rollers. they bear 60 Rockwell hardness and are suitable for high rotational spee...