NK28/20 Needle Roller Bearing 28x37x20mm - Machined TypeNK28 20 Needle Roller Bearing Machined Type 28mm ID x 37mm OD x 20mm Wide No Inner Ring The NK28 20 is a machined type needle roller bearing without an inner ring, designed for applications with hardened shafts and limited installation space. Its compact form makes it ideal for gearboxes, pumps, and mechanical drives where space and strength matter. Inner diameter (ID): 28mm Outer diameter (OD): 37mm Width: 20mm Type: Needle roller (without inner