NTN HK4012V2 needle roller bearing

NTN HK4012V2 belongs to needle roller bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for HK4012V2 and any equivalents.

The NTN HK series covers single-row needle roller bearings that use a stamped steel outer ring and a cage to guide the needles, with no inner ring included. They suit assemblies where radial room is limited but the shaft must still carry high loads and remain rigid, because the shaft itself, once hardened and ground, becomes the raceway. You will find them in transmissions, pumps, power tools and automated machinery.

Reading the HK code is straightforward once you know the blocks. HK marks the design: a needle roller bearing with a stamped outer ring. The first digits give the bore diameter, the next ones the width. Take HK4012V2: 40 is the bore, 12 the width, and the V2 suffix points to a cage or internal variant set by the manufacturer. Use that pattern to find any size in the series.

These bearings show up wherever radial space is tight: gearboxes, hydraulic pumps, compressors, electric motors, machine tools, packaging lines and conveyor drives. Maintenance teams in food processing, metallurgy, plastics and automotive plants rely on them. Their slim profile also lets you replace bushings or larger-section bearings when the outer diameter has to shrink.

Selection starts with the shaft. Because there is no inner ring, the shaft must be hardened and ground to act as the raceway, with the right hardness and roughness. Check radial clearance, choose grease or oil based on the assembly, and verify alignment between shaft and housing, as these bearings do not tolerate misalignment well. Sealing the assembly keeps contaminants out and supports service life.

Needle roller bearings with an outer ring carry different codes from brand to brand. If you have a reference from another maker, we can cross it to the NTN HK series and give you the compatible number. Interchangeability hinges on bore, outer diameter, width and cage type, so send the full size or have the part on hand when you request a quote.

For an HK series bearing, message us the code or your application dimensions on WhatsApp. We will quote the exact reference and advise on mounting and lubrication. You can also ask about other needle roller series and the mounting accessories your equipment needs.