NTN 4T-LM78349A/LM78310A tapered roller bearing

NTN 4T-LM78349A/LM78310A belongs to tapered 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 4T-LM78349A/LM78310A and any equivalents.

NTN J series tapered roller bearings are built to carry radial and axial loads at the same time. The tapered rollers and raceways spread the load across a wider contact area than ball bearings do, so these bearings suit equipment with heavy loads. You will find them in gearboxes, transmission shafts and other industrial machinery where precision and load capacity matter. MR Industrial Accessories supplies this series to customers throughout the United States and Latin America.

The part number tells you what you are holding. Take 4T-LM78349A†/LM78310A††: the 4T prefix marks an NTN execution, LM78349A is the cone and LM78310A is the cup, and the A suffix points to a design variant. Bearings in the J series share standardized dimensions, while suffixes can indicate contact angle, heat treatment or internal clearance. Reading these codes correctly is the first step in choosing the right bearing.

These bearings show up in gearboxes and reducers, wheel shafts, pumps, fans and mining equipment. Agricultural machinery such as seeders and combine harvesters also relies on them, since combined loads and tough conditions demand a robust bearing. Mounted in pairs, they can take axial loads in both directions, which makes them a flexible choice for many power transmission setups.

Selection starts with the radial and axial loads the bearing will see, along with speed and the surrounding environment. Mounting calls for precise alignment and correct adjustment of internal clearance, which you can set with shims or nuts. Grease or oil both work as long as the lubricant matches the operating temperature and speed. Sealing keeps dust and particles out; in critical spots, consider bearings with integrated seals or add radial shaft seals.

NTN J series bearings interchange with other brands that use the same dimensional and designation standards. When replacing one, check the bore, outer diameter and width, but also the contact angle and internal clearance, because those details affect performance. If you only have another brand's code or an unidentified part, send it to MR Industrial Accessories and we will identify the compatible equivalent and quote the right option.

Need an NTN J series tapered roller bearing? Send the code or the measurements from your equipment via WhatsApp or email. MR Industrial Accessories will quote promptly and help you confirm the selection. We can also assist with lubrication and mounting accessories.