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High radial load capacity for heavy‑duty transmissions and axles – The OEM NJ307EV cylindrical roller bearing is engineered to support extremely high radial loads while allowing limited axial displacement. With a separable inner ring and two integral flanges, this bearing is ideal for gearbox shafts, pinion supports, and wheel hub applications where reliability under shock loads is critical. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The NJ307EV cylindrical roller bearing features a solid outer ring, a separable inner ring with two integral ribs, and a full complement of precision‑ground rollers guided by a machined brass cage. Its 35 mm bore, 80 mm outer diameter, and 21 mm width make it a direct replacement for original drivetrain bearings in SINOTRUK Homan trucks.
The NJ307EV single‑row cylindrical roller bearing is designed with line contact between rollers and raceways, offering exceptionally high radial load capacity compared to ball bearings of the same size. The two integral flanges on the inner ring guide the rollers precisely, preventing skewing and ensuring uniform load distribution.
This bearing type allows limited axial displacement (one direction) between the inner and outer rings, accommodating thermal expansion and manufacturing tolerances in gearbox assemblies. The separable design simplifies mounting, as the inner ring with rollers and cage can be installed separately from the outer ring.
The NJ307EV is manufactured from vacuum‑degassed 100Cr6 (AISI 52100) steel, with raceways hardened to 60‑64 HRC and superfinished to Ra ≤ 0.1 μm. This results in low friction, reduced noise, and extended service life under high‑speed and high‑load conditions typical for SINOTRUK Homan drivetrain applications.
Dynamic load rating 85 kN, static rating 110 kN. The NJ307EV handles extreme radial forces from gear meshing and wheel impacts.
Inner ring with rollers/cage can be removed independently, simplifying assembly and maintenance in tight gearbox spaces.
Machined brass cage (EV suffix) provides superior strength, low friction, and excellent wear resistance even at high temperatures.
| OEM Number | NJ307EV |
| Product Name | Single-Row Cylindrical Roller Bearing (with brass cage) |
| Brand | SINOTRUK Homan |
| Bore Diameter (d) | 35 mm |
| Outer Diameter (D) | 80 mm |
| Width (B) | 21 mm |
| Dynamic Load Rating (C) | 85 kN (19,110 lbf) |
| Static Load Rating (C0) | 110 kN (24,730 lbf) |
| Fatigue Limit (Pu) | 14.0 kN (3,150 lbf) |
| Limiting Speed (grease) | 7,500 rpm |
| Limiting Speed (oil) | 9,000 rpm |
| Cage Material | Machined brass (EV designation) |
| Roller & Raceway Material | 100Cr6 (AISI 52100), through-hardened 60‑64 HRC |
| Surface Finish (raceway) | Ra ≤ 0.1 μm, superfinished |
| Operating Temperature Range | -40°C to +150°C (continuous) |
| Lubrication | Oil bath or NLGI #2 EP grease |
| Applications | Gearbox shafts, differential pinions, wheel hubs, PTO units, electric motor supports |
| Compatible Models | SINOTRUK HOWO, A7, T7H, C7H; ZF transmissions, Fast gearboxes, heavy truck axles |
The NJ307EV bearing is manufactured using advanced roller‑forming and raceway grinding technology. Rollers are centreless‑ground to sub‑micron tolerances and logarithmically crowned to prevent edge loading. The brass cage is precision‑machined from a solid casting, providing superior wear resistance and low friction.
The two integral flanges on the inner ring guide each roller individually, eliminating skew and ensuring pure rolling motion. This design also allows the bearing to accommodate axial displacement in one direction (up to 0.5 mm), making it ideal for floating bearing positions in gearbox shafts.
Each NJ307EV is 100% tested for bore diameter, outer diameter, width, radial runout, and rotational torque. Random samples undergo dynamic load testing (ISO 281), debris contamination tests (500 hours with 50 μm test dust), and corrosion resistance (480h salt spray). The bearing meets ISO 15 and SINOTRUK Homan engineering standard Q/SQ 1010.
The 100Cr6 steel is vacuum‑degassed to eliminate non‑metallic inclusions that cause premature spalling. Raceways are induction‑hardened to 60‑64 HRC and then superfinished, creating a mirror‑like surface that reduces friction and promotes oil film formation. The brass cage is heat‑treated for improved ductility and resistance to shock loads.
The NJ307EV also features a black‑oxide coating on the ring faces, which provides temporary corrosion protection during storage and helps retain lubricant in service.
The NJ307EV is a direct OEM replacement for original bearings in SINOTRUK Homan gearboxes and axles. Because the bearing is separable, you can first press the outer ring into the housing, then install the inner ring with rollers and cage onto the shaft. This reduces the risk of damage during assembly.
Recommended shaft hardness is ≥ 58 HRC with a surface finish Ra ≤ 0.2 μm. Housing bore should be machined to P6 or N6 tolerance for interference fit. Use a proper bearing heater or induction heater to warm the inner ring to 80‑100°C before mounting onto the shaft.
1) Inspect the shaft and housing for burrs, nicks, or wear. The shaft must have a chamfered lead‑in edge. 2) Clean all components with a lint‑free cloth and solvent; dry thoroughly.
3) Apply a thin film of clean oil to the shaft and housing bore. 4) Heat the inner ring of the NJ307EV to 80‑100°C using an induction heater (never an open flame).
5) Slide the inner ring onto the shaft until it contacts the shoulder. Hold in place until it cools and shrinks into position. 6) Press the outer ring into the housing bore using a sleeve that contacts only the ring face. Ensure the bearing is square to the bore.
7) After both rings are mounted, slide the shaft into the housing. The bearing should rotate smoothly with no binding. 8) Lubricate with the specified grease or fill gearbox with oil before operation.
The NJ307EV bearing requires periodic lubrication checks. Signs of wear: increased operating noise (grinding or growling), excessive vibration, or metal particles in the oil filter. Replace the bearing immediately if any of these occur.
Never reuse a bearing that has been run to failure – damage to rollers and raceways may not be visible. Always replace the shaft seal and inspect the housing bore for wear when replacing the bearing. For gearbox applications, use a magnetic drain plug to monitor metallic debris.
The NJ307EV cylindrical roller bearing is manufactured under IATF 16949 and ISO 14001 certified systems. Each bearing is 100% inspected for dimensional accuracy, radial clearance, and rotational torque. Random samples are tested for dynamic load capacity (ISO 281), debris tolerance (500 hours with 50 μm test dust), and corrosion resistance (480h salt spray).
The bearing meets ISO 15 (dimensions) and ISO 492 (tolerances). A laser‑etched batch code on the outer ring face provides full traceability. Counterfeit bearings often have inconsistent roller diameters, rough raceways, or a pressed steel cage instead of brass. Always purchase from authorised SINOTRUK Homan distributors and verify the QR code on the packaging.
A fleet of 400 SINOTRUK HOWO trucks operating in Australian mining conditions replaced their original gearbox input shaft bearings with the NJ307EV. After 2 years and over 300,000 km per truck, no bearing‑related failures were reported, and gearbox oil analysis showed minimal metal wear particles.
Another user – a logistics company in Poland – installed these bearings in the differential pinions of 150 T7H tractor units. The bearings survived extreme winter temperatures (-35°C) and high‑speed motorway driving without any premature wear, extending differential service intervals by 50%.
Each genuine NJ307EV bearing is packed in a sealed anti‑rust pouch inside a SINOTRUK Homan branded carton. The box includes a QR code and a hologram sticker. The bearing outer ring has the OEM number laser‑etched, and the rollers are coated with a light preservative oil.
Counterfeit bearings often have a dull finish, missing etch, or a pressed steel cage (the genuine NJ307EV always has a machined brass cage). The genuine bearing rotates smoothly with a consistent, light drag. Always scan the QR code before installation. Using a fake bearing can lead to shaft seizure, gearbox failure, and void the vehicle warranty.
Summary: The SINOTRUK Homan Cylindrical Roller Bearing (OEM NJ307EV) delivers outstanding radial load capacity, high speed capability, and long service life for gearboxes, differentials, and wheel hubs. Ensure reliable drivetrain performance – choose this genuine component trusted by fleets and mechanics worldwide.
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